New problem....

[Rohit]

Sir when I start the bike it idle at 900 - 1000 rpm but after few minutes the rpm starts decreasing and it stops .... Than I increase the idle speed it again starts idle for few mins than stops ... And after it ,it will not start... After it cools down it starts very well and I have to decrease the idle speed which I increased when it stopped.... And every thing which I explained it starts happening again....
Secondly, when I try to ride it the rpm doesn't go beyond 2500 it tends to stop because of which I have to change gears quickly and ride at low rpm... And the bike starts stoping after just 600 metres of ride...

[Rohit]

The rpm problem is solved ..... But it stops after a round of like 1km .... At that time the starter is not able to start as at that time engine does not crank properly but after few mins it starts again..... Pls help I am stucked up with this problem...
Ask something if you can not understand the problem waiting for replies ....

[Rohit]

And one thing I missed , I have also changed the rings of piston in its rebuild....

[steve murdoch icoa #5322]

If you are having trouble with the idle and the bike not revving past 2500 it sounds like you are going to need to clean the carbs again.
Many of us have taken 2 or 3 attempts at cleaning to get everything in order.

[Rohit]

Sir rpm problem is already solved and you are right it solved after cleaning the carbs ..... But now the problem is it stops after 1km ride and than starts when it cools down after few mins ... Pls help I am really very much stucked with this problem and unable to proceed further..... Thanks....

[steve murdoch icoa #5322]

If you are convinced the carbs are clean another area to check would be a clogged gas cap vent.
There is a tiny hole in the cap that when clogged can restrict gas flow. It usually takes longer than 1 km to show up but it might be the problem.
Another area to check would be the filter in the petcock.

[EMS]

Difficult to diagnose these problems across continents...but another one could be the coils. Cracked coils have a tendency to act up when they get warm. Just guessing.

[Rohit]

Sir I got the coils checked .... They are fine... Sir when it stops at that time try to start it , the engine does not crank properly it rotates very slowly I think which can be the reason for not starting .... When it cools down it rotate speedily and starts... Can this be due to new rings of pistons....

[Rohit]

Sir I hav checked the hole in the cap and the Petcock both found ok.....

[daves79x]

Sounds like you have a battery with a bad cell - I'd load check it first. Then the starter would be next.

Dave

[cbx6ss]

From rebuild; have cams been installed correctly (180 degrees off?) cam timing correct?

[Rohit]

Yes sir the cam timing is correct..... And I did the load test ad the battery , no problem with the battery ....

[Rohit]

Sir did every thing now but still it stops after 1km round .... And starts well after 20 mins .....
Can this be because of new rings .... Pls help...,

[Rohit]

Has anyone ever faced any problem like this before .....

[Larry Zimmer]

Has this engine been rebuilt? If so, do you have a good record of the bearing clearances for the crankshaft and the camshafts? This may be a far-out thought. Could heat be causing excess bearing friction due to a bearing(s) being fitted too tightly? I would think this condition would cause out-right seizure. However, if you are sufficiently sensitive, you may be stopping the engine before this is happening. Another thought I would have is that it is related to ignition timing.

We shall continue trying.