Engine smokes.... only when hot?

Gunny · **Joined:** Sun Jul 25, 2010 2:26 am **Posts:** 39

I cant see any oil in the air baox, and it doesnt look like its blockd... but, it does smell strongly of gas

66Sprint · **Posted:** Sat Jul 31, 2010 10:55 pm

What smells strongly of gas?...The oil or the airbox?.....IF it's the oil, don't run the engine anymore until you change the oil and find out how fuel got in there.....

Gunny · **Joined:** Sun Jul 25, 2010 2:26 am **Posts:** 39

The air box, and air filter smells like gas

Bike-Mart · **Posted:** Sun Aug 01, 2010 2:23 am

If the engine has been popping back through the carbs then it will smell of gas.
The reason I asked about the breather was if it intermitently blocks then the engine would build up pressure internally and could then force oil down the valve guides.
Just an idea.

Gunny · **Joined:** Sun Jul 25, 2010 2:26 am **Posts:** 39

and thats the black rubber tube going going into the valve cover?

Bike-Mart · **Posted:** Sun Aug 01, 2010 1:43 pm

Thats the one.

Gunny · **Joined:** Sun Jul 25, 2010 2:26 am **Posts:** 39

no, its not blocked.... but i checked compression and the right one is 140 PSI, and the other is 135 PSI. claymer says 185 +or- 14... would this be it, or is it probably the valve guide seals?

66Sprint · **Posted:** Sun Aug 01, 2010 2:43 pm

Both readings are well below minimum specs...You need at least a re-ring/top end freshening job.....Once the head is off, you can check it with acetone to see if valves are sealing correctly........

Gunny · **Joined:** Sun Jul 25, 2010 2:26 am **Posts:** 39

how do you use acetone?

66Sprint · **Posted:** Sun Aug 01, 2010 2:56 pm

For the intake sides, fill above (before) the closed valve and look for any seepage into the inside of the head.... ANY leakage at all is unacceptable.......exhaust is "after" the valve (pour where the stem and springs are after setting the head so it "holds" the liquid.......)

Engine smokes.... only when hot?

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