Snowmobile Taiga Varyag 550: technical characteristics, reviews

The RMZ 550 power unit is produced by RM Detail LLC, a subsidiary of Russian Mechanics JSC. This power unit consists of a two-stroke engine and a gearbox (variator). Designed to equip domestic Taiga snowmobiles produced by Russian Mechanics JSC.

The RMZ 550 two-stroke engine used on domestically produced snowmobiles under the Taiga brand combines high reliability and ease of repair. During major repairs, cylinders can be bored to the nearest repair dimensions, and commercially available parts and ass. CPG and ShPG units according to groups of repair sizes make repairs cheaper. I will provide information about the most possible weak points and shortcomings of the motor that one encounters when operating Taiga snowmobiles.

Weaknesses and shortcomings of the RMZ 550 engine

The RMZ 550 power unit is produced by RM Detail LLC, a subsidiary of Russian Mechanics JSC.
This power unit consists of a two-stroke engine and a gearbox (variator). Designed to equip domestic Taiga snowmobiles produced by Russian Mechanics JSC. The RMZ 550 two-stroke engine used on domestically produced snowmobiles under the Taiga brand combines high reliability and ease of repair. During major repairs, cylinders can be bored to the nearest repair dimensions, and commercially available parts and ass. CPG and ShPG units according to groups of repair sizes make repairs cheaper. I will provide information about the most possible weak points and shortcomings of the motor that one encounters when operating Taiga snowmobiles.

Snowmobile engine Taiga 850 Bars - how much oil to fill

Taiga 850 Bars is one of the largest snowmobiles produced at the Russian Mechanics enterprise. The model, which entered the production line in 2010, is designed on the basis of its predecessor, the Taiga 550 Patrol SWT, which has proven itself with its high performance characteristics. However, the more modern model is equipped with a new MPE 850NA engine, which is manufactured in Germany. In addition, the car received different engine mounts, more powerful cooling and an enlarged fuel tank.

A more robust gearbox is also installed, suitable for towing trailers. Includes 600mm Super Wide Track (SWT) and wide Camoplast skis. There is a comfortable two-seater seat with a removable backrest and passenger handles. The maximum power reserve is 300 kilometers.

Gasoline engines 2010

846cc four-stroke MPE 850NA cm (75 hp), oil volume - 2.4 liters, specifications: API-SG, SAE 0W-40

Characteristics of the RMZ 550 engine

Engine

Single carburetor engine (A)

Twin carburetor engine (B)

Engine technical data

A – engine with one carburetor; B – engine with two carburetors

Engine speed at maximum power modes. The crankshaft axial play is not adjustable. At 6000 rpm (engine cold) with headlight on. All resistance measurements must be carried out with parts at room temperature (~ 20 ºC). Temperature significantly affects resistance measurements. The force applied midway between the pulleys to obtain a given deflection.

The snowmobile is equipped with a two-cylinder, two-stroke with loop crank-chamber purge, carburetor engine model RMZ-500, forced air cooling. Figure 13 corresponds to the basic engine configuration. At the consumer's request, the engine can be equipped with two carburetors, a separate lubrication system and an electric start system.

Crankshaft

The crankshaft consists of the left 4, right 30 and middle 31 axles and cheeks 32, interconnected by press fits. The crankshaft is supported by five bearings 2. The ends of the crankshaft emerging from the crank chambers of the crankcase are sealed with cuffs 3. A flywheel 29 (magdino rotor) is installed at the right end of the crankshaft, and a centrifugal variator regulator is installed at the left end.

Connecting rods

Connecting rods 33 provide articulated connection between the pistons and the rotating crankshaft. Needle bearings are installed in the holes of the upper and lower connecting rod heads. The radial clearance in the bearings is 0.012…0.024 mm. The specified clearances are ensured by sorting by diameter into size groups of bearing rollers, piston and crank pins and the corresponding holes of the connecting rods. The connecting rod hole group is marked on the rod near each head (numbers 1...6 for the upper head, numbers 1...7 for the lower head).

Pistons

Pistons 11 are cast from aluminum alloy. For piston rings, two annular grooves are machined on the side surface of the heads. Steel locking pins in the grooves secure the lock of each ring in a specific position, which protects the rings from breakage. In the middle part of the piston there are bosses with holes for installing the piston pin.

So that during thermal expansion the piston can move freely, it is installed in a cylinder with a gap. The gap between the piston skirt and the cylinder in a cold state is 0.08...0.10 mm.

To ensure selection of liners, pistons are produced in three size groups: M, S, B (small, medium, large). The designation of the size group is marked on the inner belt of the piston skirt. Based on the diameter of the hole for the piston pin, the pistons are sorted into two size groups: the group is marked with the letters B and C. When changing the piston, it is necessary to install a piston of the corresponding group.

Figure 13 – Engine – 1 – lower half of the crankcase; 2 – bearing; 3 – cuff; 4 – left axle; 5 – upper half of the crankcase; 6 – needle bearing; 7 – gasket; 8 – piston pin; 9 – lower piston ring; 10 – upper piston ring; 11– piston; 12 – cylinder; 13 – sealing ring; 14 – cylinder head; 15 – spark plug; 16 – spark plug tip; 17 – fan housing; 18 – bearing; 19 – driven pulley; 20 – fan belt; 21 – fan impeller; 22 – air intake; 23 – nut; 24 – roller; 25 – adjusting ring; 26 – manual starter; 27 – nut; 28 – drive pulley; 29 – flywheel; 30 – right axle; 31 – middle axle; 32 – cheek; 33 – connecting rod; 34 – hairpin

35 – exhaust manifold; 36 – intake manifold; 37 – intake manifold cover; 38 – clamp; 39 – intake manifold coupling; 40 – carburetor; 41 – recoil starter handle

The piston is installed in the cylinder in such a way that the arrow marked on the piston head is directed towards the outlet port of the cylinder.

Piston rings

Each piston is equipped with two piston rings 9 and 10, which provide the necessary seal between the piston and the cylinder and heat removal from the piston head to the cylinder walls. The ring lock has a thermal gap. When installing rings into the engine cylinder at a depth of 15...16 mm from the upper edge of the liner, the gap should be: at the top ring 0.20...0.45 mm, at the bottom - 0.20...0.35 mm. The gap between the ends of the ring and the groove when the ring is compressed to a diameter of 72 mm should be 0.03...0.07 mm at the lower ring and 0.035...0.08 mm at the upper ring.

Piston pins

Piston pins 8 are designed to articulate the piston with the connecting rod. Based on their outer diameter, piston pins are sorted into two size groups. The groups are marked with the letters B and C on the outer surface of the finger. When assembling, the pin and piston are selected from the same group.

Cylinders and cylinder heads

Cylinders 12 consist of an aluminum jacket and a liner pressed into it. To ensure selective assembly of the liner-piston interface, the cylinders are produced in three size groups. The size groups are designated by letters (M, C, B) and are marked with impact on the belt at the lower end of the cylinder. When changing a cylinder, it is necessary to install a cylinder of the corresponding group. The 14th cylinder head is installed on the upper end of the cylinder. To ensure the required degree of compression, the heads are produced in four size groups and are marked with numbers 1…4. A rubber sealing ring 13 is installed between the head and the cylinder, and a gasket 7 is installed between the lower end of the cylinder and the supporting plane of the crankcase. Each cylinder and head are secured to the crankcase using four studs. To avoid unacceptable deformation of the head and cylinder, during assembly the stud nuts are tightened crosswise in two steps: first preliminary, and then finally with a tightening torque of 2.2...2.4 kgf-m. The nuts should only be tightened when the engine is cold.

Carter

The crankcase consists of two halves 1 and 5. The crankcase halves are connected to each other with bolts and screws, tightened with a torque of 2.2...2.4 kgf-m. During assembly, the crankcase connector planes are lubricated with sealant. To ensure alignment of the crankshaft support bearing bores, both crankcase halves are machined together and are therefore not interchangeable. Four studs 34, screwed into the bosses of the lower half of the crankcase, serve to secure the engine to the sub-engine base. The magdino base and fan housing 17 are installed on the crankcase flange on the right side.

Engine cooling system

The air cooling system is designed to remove excess heat from the engine and includes a blower fan and air shrouds. The basis of the fan is the housing 17. In the housing, on two oil-filled bearings 18, a roller 24 is installed with a driven pulley 19, consisting of two half-pulleys, and an impeller 21. The impeller is driven by a V-belt 20 from the drive pulley 28, mounted on the flywheel 29 Magdino. Nut 23 securing the pulley is tightened with a torque of 4.5...5.0 kgf-m.

The belt is tensioned by moving the adjusting rings 25 located between the half-pulleys to the outside of the rear half-pulley. When operating the engine, it is necessary to periodically check the tension of the fan belt. Under a force of 5±0.5 kgf, the belt should bend by 8...9 mm. Weak tension causes the belt to slip at high engine speeds and be damaged by heat. Strong tension damages the bearings of the driven fan assembly.

Grease should not come into contact with the belt.

Recoil starter

The recoil starter 26 is located on the fan housing flange on the right side of the engine. In the starter housing, the parts are installed on the axle in the following order: a return coil spring, a cover, a pulley with a cam and a cord wound into the pulley groove, a carrier, a washer, a spring and a ring that secures the parts on the axle. The inner end of the spiral spring is engaged in the slot of the pulley, and the outer end is engaged in the slot in the spring housing. When viewed from the inside of the starter housing, the coil spring winding should be directed clockwise, and the cord winding should be counterclockwise. The end of the cord is brought out through the hole in the starter housing and secured in the starter handle.

Exhaust system

The exhaust system is designed to remove exhaust gases from the engine cylinders into the atmosphere and reduce exhaust noise.

On snowmobiles with a single-carburetor engine, the exhaust system includes a muffler and a connecting pipe through which the muffler is connected to the cylinder exhaust pipe. The muffler is attached to the snowmobile body and connecting pipe by springs. The connecting pipe is attached to the cylinder exhaust pipe also using springs.

On snowmobiles with a two-carburetor engine, the exhaust system includes a muffler, which is attached by springs directly to the exhaust pipe of the engine cylinders and to the body of the snowmobile.

Engine mount

The base with the engine is mounted on the snowmobile frame at four points on the shock absorbers. An adjustable stop bracket is attached to the left rear engine base mount.

The engine is attached to the base using studs screwed into the bosses of the lower half of the crankcase. A steel bushing is installed on each stud between the engine and the base. The tightening torque of the nuts securing the engine to the base is 2.7…3.0 kgf-m.

To adjust the distance between the variator pulleys and ensure parallelism of the pulley axes, which is achieved by moving the base with the engine, grooves are made in the base. Adjusting washers are installed between the front shock absorbers and the base, designed to eliminate misalignment of the axes of the variator pulleys. After adjustment, the base fastening nuts are tightened with a torque of 2.7...3.0 kgf-m. During operation, the tightness of the nuts must be checked periodically, since displacement of the base with the engine leads to rapid failure of the variator belt.

Tightening torques for engine threaded connections

A – engine with one carburetor; B – engine with two carburetors

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Weaknesses of the RMZ 550 engine

The pistons burn out. This problem is relevant for engine models produced before May 2013. The reason is a manufacturing defect: a deviation of the ignition timing by 3-5 degrees in the Ducati ignition system, which contributes to an increase in temperature during the exhaust stroke. This defect did not bypass the RMZ motors: 250; 551, which have the same ignition system. To prevent piston burnout and eliminate the defect, it is necessary to correctly adjust the ignition timing.

Ignition coil. If there are problems with the spark plugs, they often fail. A spare coil must be included in the transported spare parts.

Spark plug. If the spark plugs are faulty (carbon deposits, large gaps), backfires occur when the engine is running, and the internal combustion engine does not develop maximum power and maximum speed. To eliminate the defect, it is necessary to inspect the spark plugs for the presence of carbon deposits, remove carbon deposits if present, or replace the spark plugs. In addition, it is necessary to check the gap between the electrodes and bring it into compliance with 0.75 ± 0.05 mm.

Ignition. The ignition must be set very precisely. With early ignition, as with faulty spark plugs, backfire occurs during operation.

Leaking gaskets. Protrusions and oil leaks from under the oil pan gasket should not be ignored. If there are oily spots on the engine (under it), it is necessary to take measures to replace faulty parts. For uninterrupted operation, the engine must be periodically pressurized under a pressure of 0.35-040 kgf/cm² for 3 minutes, and the pressure should not drop for 3-5 minutes, since leaks in the internal combustion engine cannot always be determined by visible signs. If this is not done, then at one point the oil may leak out, and if there is no oil, the internal combustion engine will inevitably fail.

Carburetors. They require fine tuning for synchronous operation in all engine operating modes. Problems common to all carburetors: clogged jets, fuel leakage.

Fuel pump. If it fails, the operation of the internal combustion engine becomes impossible. To avoid problems during the trip, you should have a spare pump with you.

Variable speed drive. Requires periodic adjustment.

Belt variator. It is necessary to check the tension and condition of the belt daily. If the belt wears 3 mm in width, it needs to be replaced. Otherwise, the engine will not be able to develop maximum speed and power.

Fan belt. Failure to adjust the tension and wear of the belt leads to slippage and deterioration of the fan operation, and at the same time the engine overheats.

The rubber cushions (shock absorbers) under the engine are torn. The reason is poor quality tires.

Reviews

Model Taiga ST-500

Igor, Ulyanovsk. Not a bad snowmobile for the money. I drove it from 2006 to 2015, and then changed it to a Viking. But I remember Taiga only with kind words. Quite durable and repairable equipment, which has many advantages. Of these, I would like to note the effective reserve of a manual starter at any low temperature - largely thanks to the Japanese carburetor. In addition, the weight is quite light compared to foreign cars, which is especially noticeable in early spring on the river on thin ice - fishermen will understand.

Disadvantages of the RMZ 550 engine

• Poor quality installation of spark plugs on armored ignition wires during assembly in production. A simple auditory defect causes the destruction of the CPG. The problem was identified on snowmobiles manufactured before May 1, 2013;
• Piston jamming. This happens when the engine speed is rapidly increased when the engine is not warmed up. Cold cylinders, due to their larger volume and mass, expand more slowly when the engine starts running than pistons;
• Huge fuel consumption. On average from 25 to 27 liters per 100 km;
• Uneconomical to operate;
• Low resource. The main disadvantage of all two-stroke internal combustion engines, especially air-cooled ones, is the low service life of the engine before major repairs. For RMZ 550, the resource is within the range of 3,000 - 5,000 km.
• Prone to overheating due to design flaws, which is the main criterion for the problem of low resource reserve.

PS Dear owners of Taiga snowmobiles: Varyag 550 V SE, V, Patrul SWT! You can add your opinions on internal combustion engines and reviews through the comment form.

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Engine RMZ - 500 avia

The domestic 2-cylinder engine RMZ 500 is an analogue, or rather a complete copy of the “authoritative” ROTAX 503.

With the domestic quality of “reproduction” I lost 2 hp of power, but otherwise it was quite affordable on a budget

and a very reliable engine. RMZ 550 is an attempt (increased displacement slightly) to gain lost power

when copying ROTAX. Otherwise, they are no different from 500 thousand.

Technical characteristics of RMZ - 500

Everything you see on our website can be bought: paragliders, hang gliders, paramotors, paragliders and other UAVs, as well as radio communications, navigation, etc., call and write to [email protected] Skype: amd7373. We send equipment to the regions by postal or transport company. It is also possible to rent paragliding and hang gliding equipment on our flights.

Attention! The structural elements used in the aircraft we produce cannot be used in aircraft of other manufacturers without appropriate adaptation modifications! Since each manufacturer has its own standards.

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Has anyone tried this RMZ-501 motor for a parallet?

Reed valve per cylinder,

There is also some information floating around about the RMZ-550, but nothing really is known yet.

Snowmobile Taiga ST-550DR "LUX-II" Snowmobile Taiga ST-550DR "ATAKA-II"

You understood absolutely correctly. We provide the same warranty for the engine as the factory does. At the same time, we maintain the engine's factory life. If anyone is in the know, then by opening the engine you can always find the cause of the failure, and there are no controversial issues. My personal opinion on “small-scale” issues: no factory can compete with “true” masters. I talked with the operation department of Russian Mechanics, there is a group of “enthusiasts” there, so they are pushing this topic on fine-tuning the RMZ-500 to 501 and 550, they also had intentions for reed valves, additionally. channels, etc.. But this is a factory and it is not always possible to break through the “wall”. Life has not yet forced everyone to think “correctly”. They told me this: we don’t even know whether it will be in the series or not.

As for “having a hand,” you said it well. It is desirable that these “hands” are not crooked. I was at a para-party a couple of days ago. I saw very different trikes there, including Pisman: they all fly, and they fly perfectly. We understand that you can fly on a stool if it’s not too stormy. I think the most important question is the behavior of the trike in an emergency situation. So, before my eyes, SKAT’s axle shaft came off, the gas tank leaked, and he made a “turtle” with known consequences. The man was miraculously not injured. Of course, I cannot say how our Skybike would behave in such a situation, but I can definitely assure you: it will never make a “turtle”.

It is in vain that you assert so confidently. Just draw your own conclusions. No comments / I hope the reason is obvious and it is not in the design.

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What kind of oil to fill in Taiga snowmobile engines

For two-stroke engines

For two-stroke engines of Taiga snowmobiles, mineral, semi-synthetic or synthetic motor oil with different viscosities is recommended. So, for cars of the first years of production, mineral water is suitable, and for newer models - semi-synthetic or synthetic. Official Buran dealers recommend branded synthetic oil RM Taiga 2-T TU 0253-001-94265207-06 for two-stroke engines. You can also choose the imported analogue of Bombardier Formula XP-S.

For four-stroke engines

For the Taiga 850 Bars snowmobile with a four-stroke engine, we recommend synthetic oil Snowmobile RM TU 0253-011-94265207-11 with a viscosity of 0W-40 and API-SJ approval

RMZ 550 reed valve dimensions

Intake manifold/intake pipe gasket Russian Mechanics RMZ-500 Original name: Gasket C40500008 Suitable for: TAIGA ST-500D ClassicTAIGA ST-500D LeaderTAIGA ST-500D SputnikTAIGA ST-500D PatrolTAIGA Classic 500TAIGA Varyag 500OEM: C40500008Original spare part “Russian Mechanics”

O-ring of the intake manifold Russian Mechanics RMZ-640Original name: O-ring 110500996 Suitable for: Buran ABuran ADBuran ADEBuran LBuran LEBuran LDBuran LDEBuran AEBuran ATEBuran ADTEOEM: 110500996Original spare part "R" Russian Mechanics"

Carburetor pipe Russian Mechanics Taiga Original name: Coupling S40500009 in package 119801930 Suitable for: TAIGA ST-500D ClassicTAIGA ST-500D LeaderTAIGA Classic 500TAIGA Varyag 500TAYGA 550 SE VaryagTAIGA Varyag 550TAIGA Varyag 55 0 VOEM: C40500009, 119801930 Carburetor pipe for 1 - but carb. motorOriginal spare part "Russian Mechanics"

O-ring of the intake manifold Russian Mechanics RMZ-640Pack of 2 pcs. Original name: Ring 110500107 (2 pcs.) per package 119802040-01 Suitable for: Buran ABuran ADBuran ADEBuran LBuran LEBuran LDBuran LDEBuran AEBuran ATEBuran ADTE OEM: 110500107, 119802040-01, 119802040Original spare part "Russian Mechanics"

Leaf valve gasket Russian Mechanics RMZ-550/551 Original name: Gasket K20500016 Suitable for: TAYGA 550 SETAYGA Patrul 550 SWTTAYGA 550 SE VaryagTAIGA Varyag 550TAIGA Varyag 550 VTAYGA Lux 550 IITAYGA Attack 551 IIT AYGA Patrul 551 SWTOEM: K20500016Original Russian Mechanics spare part

RMZ 550 reed valve dimensions

Post by Sanya » 05 Dec 2008, 14:11

Post by Sanya » 05 Dec 2008, 14:21

Regarding the debate about bypass windows, there are practically none on the crankcase, mainly in the cylinders

Cylinder PD-10 from the end

The IZH-P-3 cylinder from the end has side covers lying around somewhere, in reality the windows are smaller.

The PD-10 bypass windows actually have a larger hole inside the carb, and a smaller hole from the crank to the cylinder.

And accordingly IZH-P

both cylinders were lying in the barn, so their condition is not so great.

Post by lunatik-1 » 05 Dec 2008, 14:35

. the idea is probably correct.

Hybrids IL Planet-SZD-launcher are of great interest.

It is necessary not to create topics with Izhiks, but to create your own, where you can compare their compatibility and differences, including by photo.

Otherwise, it will be inconvenient later, there is a theme “Planet vs T200”. There will be one of our own here, our own. Otherwise, in any topic with the presence of the Planet, the conversation in any case slides into forced dropsy.

No one will be against it, I can rename this one, I can create a separate one.

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