Snowmobiles "Buran" are equipped with several types of carburetors. One of the most popular fuel devices is the Mikuni carburetor for Buran. This is an economical, trouble-free mechanism. Thanks to its simple design and ease of maintenance, it has won a lot of fans all over the world. All owner reviews about this type of carburetor are invariably positive.
Operation of technical equipment in winter requires a special approach to the quality of main components and mechanisms. The fuel mixture is prepared at constant sub-zero temperatures. Therefore, in the Buran snowmobile, the manufacturer practices installing a Mikuni carburetor on the Buran snowmobile.
The design of the Mikuni carburetor on Buran
The good thing about this carburetor is that it is attached directly to the engine pipe with two M6 bolts. There is no need to adjust the gaps; the fastening is rigid, classic, through two rectangular gaskets made of petrol-resistant rubber. The cross-section of the gasket material is 1 mm; the gaskets are glued to rectangular pipes in special grooves for fastening to the engine.
Two cables are stretched from the control handles of the Buran snowmobile. One cable controls the fuel supply, it is called gas, the second cable controls the enricher - the air damper. Both cables are equipped with bosses that are easily inserted into working fastening and control units.
- the distance between the M6 bolts for fastening the carburetor is 48 mm;
- the diameter of the passage hole for the fuel mixture entering the combustion chamber is 26 mm;
- the total height of the case is 138 mm.
⇓ First position - the flag is lowered down. The fuel channel is closed in this position.
Operating principle of the air damper
The presence of two full-fledged operating positions allows you to qualitatively regulate the quantity and volume of the enriched fuel mixture entering the ignition chamber of the internal combustion engine. Below (Fig. 2) is an analysis of each of the air damper positions.
Open channel position. The flag is raised, the additional fuel mixture supply channel is open. Additional fuel enters the engine combustion chamber, and the power unit develops maximum power.
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The role of the flag in the carburetor
If you put the flag up, the engine begins to receive a significantly larger amount of fuel. At this moment, the snowmobile operates at increased crankshaft speeds. The use of a flag greatly facilitates the operation of the entire mechanism in the cold season: autumn, winter, early spring, frost and cold.
After starting a cold engine, you should thoroughly warm up the mechanism that has cooled in the cold overnight. The raised flag allows you to do this much faster than the standard mode. The snowmobile will run for a while on suction, quickly warm up and you can hit the road.
Once the engine has reached operating temperature, a small volume of the fuel mixture is sufficient for stable, uninterrupted operation. In a similar rhythm on a snowmobile, the engine enters an economical fuel consumption mode and can be operated for a long period of time.
Adjusting the Mikuni carburetor on a Buran
- instant start without difficulty;
- stable operation during operation;
- significant fuel savings;
- better safety of spare parts, components, parts.
- Before starting a cold engine, rotate screw 5 to set the throttle to a position so that there is a gap of 2...2.5 mm between the lower generatrix of the carburetor body and the base of the throttle.
The fuel mixture will become richer. In the case when the engine stalls and stops at the moment of sharp closing of the throttle, it is necessary to unscrew screw 4 by the same number of revolutions. The fuel mixture will become lean. If the carburetor is properly adjusted, screw 4 is unscrewed no more than two turns from the fully screwed position.
The Mikuni carburetor for Buran is an excellent technical solution for a snowmobile. Its installation and operation greatly simplifies the owner’s winter chores. Adjusting the mechanism is simple. It’s better to set it up correctly once, so you don’t have to look at it all winter. Owners give only laudatory reviews about this carburetor.
It is clear from the article that the type of carburetor described is reliable, durable, and unpretentious. The mechanism is simple, without technical frills, so all reviews about it are only positive. Wide unification, stable operation in any frost. The author recommends installing Mikuni carburetors on snowmobiles, motorcycles, and all light vehicles without a doubt. This technique will not let you down.
READ FOR EVERYONE! FREQUENTLY ASKED QUESTIONS AND ANSWERS TO THEM. BURAN REPAIR MANUAL.
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Ski sizes according to "Buranchik"
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HERE IS THE COMPLETE SCHEDULE FOR ALL IGNITIONS[/QUOTE]
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Carburetors that are most often found on a Buran snowmobile and their characteristics
K-65 carburetors were and are currently also installed on different domestically produced equipment, mainly the difference is in components, diffuser diameters, GTZ, LHC and atomizer along with the needle.
Transmission Maintenance
Maintenance of a snowmobile transmission consists of making adjustments, checking the condition of the variator belt, tightening threaded connections, cleaning external surfaces of dirt and carrying out lubrication work.
For reliable operation of the variator and increasing the durability of the variator belt, the relative position of the drive and driven pulleys is important.
Check the size indicated in Figure 4 (55±0.5 mm) from the end of the fixed drive disk to the end of the fixed driven disk using two rulers. If necessary, make adjustments as follows:
Check the condition of the variator belt. If the belt is very worn
(belt width less than 30mm) or damaged, replace the belt.
To remove the variable speed belt:
Attention!
Contact with grease on the working surfaces of the variator discs is not allowed.
includes checking and adjusting the chain tension, checking the level and changing the oil in the crankcase, eliminating oil leakage at the crankcase connector.
To adjust chain tension:
ed";
turning the driven pulley disk counterclockwise until it stops
tighten the chain, turn the disk clockwise - relax. The difference between the indicated chain positions should be 1...5 mm (see Fig. 20);
By rotating the eccentric axis of the tension sprocket, set the required chain deflection. Fix the found position of the axis with a bolt.
The chain tension can be checked by the play of the variator driven pulley. Shift into forward gear. Measured by outer diameter
The backlash of the driven pulley should be 20...40 mm.
To wash the reverse box, do the following:
start the engine and, with reverse switching, run the snowmobile for 10...15 minutes;
1…7 mm
Rice. 20 — Adjusting the tension of the reverse box chain
Check the oil level in the reverse box using a special
probe through the inspection window. When checking, the bend of the probe should touch the lower edge of the inspection window. In this case, the oil level should be between the dipstick control marks.
Specifications
The standard equipment of this truck includes an electric engine starting system, which is duplicated by a kick starter. The model with the additional letter “D” in the marking differs from the base 4T in having a longer base. Otherwise, the Buran 4TD snowmobile has good technical characteristics and workmanship.
This all-terrain vehicle has several differences:
- The amount of harmful emissions has been reduced by 80%.
- Reduced vibration and noise levels.
- Fuel consumption has become lower.
In addition, the new Buran has a special platform for transporting goods and a bright spotlight. The truck is suitable not only for hunting and fishing, but also for household work.
With American engine (4-stroke)
A four-stroke air-cooled engine is installed as a power unit under the hood of the Buran. It was developed in the USA and manufactured under license in China. This motor has proven to be economical and reliable.
Specifications:
| Brand | Kohler |
| Number of cylinders, location | 2, V-shaped |
| Total volume | 747 cc cm |
| Power | 29 l. With. |
| Cylinder diameter | 8.3 cm |
| Piston stroke | 6.7 cm |
| Fuel system | injection |
| Lubrication | In the crankcase, mechanical pump |
| Ignition | Contactless, CDI |
This unit has high traction properties, the rated speed is 60 km/h for the short model, 55 km/h for the long one. The track intake system has an air filter. The exhaust has a muffler with a modified pipe; its mount is now located directly on the frame.
Fuel consumption
Thanks to the innovative fuel injection system, this truck is considered the most economical in the Buran line. Gasoline consumption per 100 km when driving at a speed of 50 km/h with a passenger is about 15 liters. If you drive at higher speeds and overcome steep climbs, this figure can reach 25 liters per hundred. Which is generally not bad if you compare this truck with earlier, two-stroke models.
The fuel tank capacity is 28 liters, there is no oil tank. For refueling, prepare the fuel mixture in a separate container. Thanks to the additional luggage rack, the owner can take more cans of gasoline on the road. The manufacturer recommends using AI-92 gasoline with a low ethyl alcohol content (no more than 10%).
Dimensions of the model and boxes
The dry weight of this all-terrain vehicle is 289 and 314 kg for models 4T and 4 TD, respectively. The truck is designed for two people and has a rear traction device for transporting cargo sleds. A snowmobile with a short wheelbase is capable of pulling a load weighing up to 250 kg, and with a long wheelbase – up to 500 kg.
Snowmobile dimensions:
| Parameter | Snowmobile | Boxes |
| Length | 2.7 m (3.1 m for version 4 TD) | 2.42 m |
| Width | 91 cm | 106 cm |
| Height | 1.44 m | 1.13 m |
Mover
A caterpillar mechanism is used as a propulsion mechanism. The classic design involves a combination of one ski with a slewing support mechanism and two tracks.
Track parameters:
| Length | 3.685 m (2.878 m at short base) |
| Width | 38 cm |
| Grouser height | 1.75 cm |
| Number of steps | 73 |
| Step | 5.05 cm |
The tape is made of composite materials and has a reinforced coating. The nature of the engagement is through windows.
Transmission
The gearbox has one forward gear and one reverse gear. To switch, a variator with an automatic tensioner is used.
Brakes
The snowmobile has a standard hydraulic disc brake. There is also a parking brake with a lock and an emergency engine stop system.
Suspension
The suspension is represented by two independent parts. The manufacturer installed an elliptical spring at the front, and an independent roller spring with a spring balancer at the rear. The travel of both suspensions is 5 cm.
Lighting and electronics
The basic package of this snowmobile track includes:
- electric starter;
- reverse;
- odometer;
- speedometer;
- heating of the gas trigger and steering handles;
- halogen headlight 55/60 lumens.
