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White smoke coming from crank case

  • Thread starter Thread starter Twowheeledlife
  • Start date Start date
Twowheeledlife said:
So, tonight I will buy a new petcock and when I put it on I'll use your methods to check and see which needle, if any are leaking. Correct?
Click to expand...
Yup. It's not that difficult:
Pull the carbs. (You gotta remove the tank to install the petcock anyway.)
Place in a container (to catch the fuel) and stabilize them so the sit with the tops of the carbs parallel to the ground.
Place your fuel container (you can use your fuel tank, I have a separate fuel container) so the top level of fuel is approximately the same height as the top of your fuel tank relative to the carbs when they are mounted on the bike.
Let the fuel flow, see which carb(s) leak.
Drain the bowls and remove them.
Pull the floats, remove the needle, clean both the needle and the seat with carb cleaner.
Put back together and repeat.
I won't let a set of carbs go until it lasts no less than an hour. (Yeah, I time it.)
When you are satisfied, reinstall and have a blast.
 
Thanks guys, I really appreciate it! The petcock is ordered and once I pull my carbs off I'll let you all know what I find. Seriously would have been completely lost if it weren't for you all, thanks again!
 
Hey guys, I replaced the petcock and changed my oil as well as testing my carburetors for leakage. Everything went well and there were no leaks. The white smoke has lessened but there still is some. The smell isn't the same as it was though which is good. Does this sound correct?
 
I'll bet your filter is real close to the crank vent. Move it back away from the vent, and it will be much less of a problem.
 
That smoke is fuel vapor that's slipping past the piston rings. Commonly known as blow-by gasses. Perfectly normal, up to a point. If there is too much it could indicate worn rings. Of course fixing the petcock and carbs is good, but unless you are dumping a bunch of fuel into the crankcase, these fixes are unlikely to help the situation.

To check the condition of your rings either a leakdown test or a compression test is in order. Needless to say, you must assure the valves are adjusted before doing tests like these. Also, the engine needs to be warm and the throttle held wide open if you do a compression test.

Hope this helps and good luck
 
Also, while you have the bowls off, check the overflow tubes for blockages. When you have a leaky float needle the fuel should run straight out the the overflow tubes and not into the crank.
 
Oldvet66, it is very close to the crankcase. Would that be a problem?
 
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