Why one cylinder does not work in the Urals

Motorcycles Ural and Dnepr

I have the following problem: I have a 6 volt Ural 2 M-63, one fine day one cylinder started working on it (the right one), I bought a new spark plug, installed it, rode it the next morning, one cylinder started working again, I swapped the spark plugs, it started The left one works, but the right one stopped working. Then I found some old spark plug in the garage, burned it, set the gap and put it in place of the non-working one, the engine started to start on one spark plug and about two minutes later the second one was connected, about a week later the right one started working again, swapped the spark plugs and it started working current left. Then I decided to reduce the spark plug gap in the idle cylinder, after which the one that was not working started working, and the one that was working stopped working. My opinion has struck the coil

What do you think about this?

Check the gap between the high-voltage wires and the spark plugs on the coil (it should be the same on both sides - about 9 mm). I had a similar thing on 12V Dnepr - after aligning the gaps everything seemed to be in order.

The gap between the high-voltage wires and the spark plugs is normal, I have already checked exactly 9mm.

It is unlikely that this is a coil, since the situation changes when the spark plugs are rearranged. Try installing new spark plugs with the correct gap and high-voltage wires, fortunately all this is not very expensive.

In my opinion, my friend’s mixture is not all right (it’s too rich) and that’s why he throws out the candles.

I agree with Manovar. The left carb is getting rich (on the left the spark plugs fly out all the time).

GoBLIN quote: I agree with Manovar. The left carb is getting rich (on the left the spark plugs fly out all the time).

Unscrew the spark plug and take a look. if it’s damp, then the mixture is rich and floods the candle, which is most likely why the candle is constantly being pierced

The whole problem was solved, just the capacitor died, so there was a very weak spark, I installed a new spark, both cylinders work perfectly, no problems.

The whole problem was solved, just the capacitor died, so there was a very weak spark, I installed a new spark, both cylinders work perfectly, no problems.

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Motorcycle engine cylinders Ural, Dnepr

The left and right cylinders 6 (Fig. 2.2) of the MT 10-32 engine are identical in design. The jacket (shell) of the cylinders is made of aluminum alloy. It is connected by diffusion to a sleeve cast from special cast iron. This makes it possible to significantly reduce the thermal stress of the piston group and ensure its high performance. Cylinder diameter 78+0-04 mm. At the bottom of the cylinder there is a flange with holes for studs, fastening the cylinders and heads to the crankcase. The upper part of the cylinder has an annular collar that fits into the cylindrical section of the head. Between the cylinder and the head there is a gasket 4 made of soft red copper 0.6 mm thick.

Cylinders 3 of the K-750M engine (Fig. 2.8) are cast from cast iron. They are not interchangeable. The left cylinder differs from the right one in the placement of the intake and exhaust valves. In the upper part, the cylinders have bosses with two valves for the intake of the working mixture and the exhaust of exhaust gases. At the bottom of the cylinder there is a flange with six holes through which the cylinder is attached to the engine with studs. Together with the cylinder flange, a valve box is cast, in which valves 13 and their spring 14 are located. In the flange of the left cylinder there is an annular groove with three holes for supplying oil through the oil line into the working area of ​​the cylinder; There are eight threaded holes in the top of the cylinder for attaching the head.

Cylinders 8 (Fig. 2.10) of the M67-36 engine (Ural) are made of cast iron. They have the same design and are interchangeable. In the upper part of the cylinder there are four holes for the head mounting studs and two holes into which the pusher rod tubes are pressed. In addition, the cylinder has a hole for a drain tube through which residual oil drains from the cavity of the cylinder head. The cylinder is attached to the engine crankcase with four studs.

Table 2 1. Size groups of pistons and cylinders

Brand

engine

Note: 1. The piston diameter is measured at the bottom of the skirt (below the lower oil scraper ring) perpendicular to the pin axis at a temperature of 20°C 2. If the cylinder is oval and tapered, its diameter is considered to be the smallest diameter.

Rice. 2.16. K-7 engine cylinder: — “Dnepr-12” (right): 1 — conical surface of the valve seat; 2 — plane of the connector with the cylinder head; 3 — plane of the connector with the engine crankcase; 4 — cylinder mirror; 5 - valve guide hole

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Shooting into the muffler with one cylinder.

Motor k750. Suddenly there was a popping sound in the muffler as gas was being discharged from the left boiler. Then there were interruptions in the left cylinder. The problem grew worse over 10 km, then went away. Then I stood for a day, came to the garage, started the engine - the same symptoms - periodically shooting into the left silencer when releasing the gas and sneezing when working at idle. If you pull the cable of the right boiler, the set of revolutions is excellent and correct, if the left one, there is a set of revolutions, but with dips and sneezes. I turned the spark plug out - it’s new, the carbon deposits on the electrode are gray. Just in case, I installed another one - there was no improvement. By the way, the deposits on the second boiler are the same. I disassembled the distributor and cleaned the contact on the cover - it didn’t help. I started it on the right boiler, put a spark plug on the left one - the spark was stable and strong. I disassembled the carb without removing it from the motorcycle - the needle was at the top all the way, the jets were turned out and blown out. It didn't help either. 65e carbs. I tried to close the damper in the air vent - both boilers remained unchanged, I tried to leave the suction on the left boiler - the same thing. I don’t really want to try swapping carbs - it’s a bummer, has anyone encountered this? I bought an ICS today - I’ll try to look at the flashes in the boilers and the presence and absence of gaps. Could a lean mixture cause shots in the jammer? I don't think so.

right left...is there a difference?

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• Alexandr67
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• Name: Alexander

• From: Smolensk
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Topic: right left...is there a difference?

Guys, the topic is this... the left one is set perfectly, the right one is a little dull, not much, but... I heard and read here that there are differences! What are your opinions... is there any marking of the difference - right - left... carbs K-65 peccaries! thank you in advance!

• on drakone
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Re: right left...is there a difference?

K-65 there is no difference, so the reason is not a dirty headlight

• Alexandr67
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Re: right left...is there a difference?

I need to clean it, there’s a little bit of a jet somewhere, it’s a bit crap, I’m not exactly complaining, but I feel like the one on the right is almost behaving incorrectly! I read an article on the forum about the 68th, that there is a difference between the right and left, so I decided to clarify for the 65th!

• on drakone
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Re: right left...is there a difference?

68 is, 301 is too, but 65 and 63 are not

maybe it's not the carb that's the problem

Edited by drakone (04-07-2014 07:58:41)

• Stierlitz
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Re: right left...is there a difference?

The only difference is the location of the quality screw. For ease of adjustment, it is moved outside, i.e. one on the right, the other on the left. The K68 also has the idle screw located in the same way, because it is not on top like in the K63-65, but on the bottom side of the carb.

My motorcycle was angry under me...

• on drakone
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Re: right left...is there a difference?

Stierlitz writes:

The only difference is the location of the quality screw. For ease of adjustment, it is moved outside, i.e. one on the right, the other on the left.

what kind of carbs are these, not just 65-63 by chance, otherwise they are clearly identical

• Alexandr67
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Re: right left...is there a difference?

Yes, no Serge, both screws turn out to be pointing to the left! In short, I need to change the quality screw itself, I don’t like its shape! slightly different from the second one, I’ll adjust it with 63, fortunately there’s a couple lying around in the garage! Probably a little screwed up!

Added: 04-07-2014 07:36:45

on drakone writes:

68 is, 301 is too, but 65 and 63 are not

maybe it's not the carb that's the problem

no, there’s definitely nothing else in it that I’ve checked from A to Z, but it’s not that it’s annoying, it’s just that it squeezes out a little and you won’t even notice it…. I just want the ideal... but I understand that this is impossible! but it’s ok, I just wanted to clarify that at 65 there is no difference between right and left

• Louis
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Re: right left...is there a difference?

Alexander, in my book about 65 it says, INTERCHANGEABLE, and on 68 it is written on the boxes (right or left), 301 - float chamber to the engine, although it seems to me that everything is the same (it’s just inconvenient to get to the adjusting bolts on the engine side)

• Antonlab
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Re: right left...is there a difference?

I agree K65 are exactly the same

• Yuri
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Re: right left...is there a difference?

If the carbs are screwed directly to the heads, then there will be a difference, since the inclinations are different - left to right-forward, right to left-forward, therefore the levels of the float chamber are different.

Added: 07/05/2014 22:28:59

It must be aligned horizontally.

• Alexei .
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Re: right left...is there a difference?

Yuri writes:

If the carbs are screwed directly to the heads, then there will be a difference, since the inclinations are different - left to right-forward, right to left-forward, therefore the levels of the float chamber are different.

Added: 07/05/2014 22:28:59

It must be aligned horizontally.

For K-63 and K-65, the main fuel jet is located strictly in the center and bottom of the float chamber and the float itself consists of two symmetrical parts. Therefore, carburetor tilts (within reasonable limits) do not affect fuel level and timing settings. And tilting the carburetor towards the head, to some extent, even improves starting a cold engine, especially in cold weather.

• Yuri
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Re: right left...is there a difference?

I had to adjust the needles differently until I aligned the carbs.....

• Alexei .
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Re: right left...is there a difference?

On the side stand the motorcycle stands at an inclination of 30 degrees, no less. The differences in operation are that on the footrest with an inclination, and that vertically, you can’t hear or see it at all.

• Alexandr67
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Re: right left...is there a difference?

everything... figured it out... I slightly turned it up by 1/5 of a turn literally more than the left one, everything is ok at all speeds at idle and behaves normally under load! but in turn and in synchronization it didn’t work as it should with.. like that!

• igor_yarmak.
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Re: right left...is there a difference?

good time uv. Colleagues, a quick question: “will one k62d work in the Urals and how to configure it correctly” with respect, thanks in advance.

• Alexandr67
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Re: right left...is there a difference?

igor_yarmak. writes:

good time uv. Colleagues, a quick question: “will one k62d work in the Urals and how to configure it correctly” with respect, thanks in advance.

work, then he will not go anywhere…. but very disgusting! there will be fuel starvation... he is the only weak one... in Russian, there will be (0) thrust, but at idle it will puff perfectly, set the car to work, then it will work as it should!!! for example, constipation or oka! Usually they get stuck... but in general it has to work on two and nothing can happen otherwise! in life! the carb will collapse, God forbid, it’s 7 km to the house and that’s it, otherwise you’ll make it on one

Edited by Alexandr67 (10-07-2014 00:54:00)

• Roma
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Re: right left...is there a difference?

Install a carb from a Chevy Camaro, 1970! There is a 4-chamber bandurina, so it will be watered!

Knocked down - fight on your knees, if you can’t get up - attack while lying down!