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condensation in fuel tank

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condensation in fuel tank

Posted by george_phillips at October 11. 2018

I've noticed a small amount of white smoke when the throttle is blipped and  - I'm told - when running normally. I fellow NOC member suggested water in the fuel tank.

I coupled this thought with the fact that when I re-assembled everything after a few weeks lay-off whilst I sorted the oil pressure system, the bike seemed really "punchy". It went well and sounded good.

Without rushing to my text books I think when water is boiled off into steam it occupies about 13 times more volume hence increasing the pressure in the combustion chamber.

So the questions are:

Should I leave it alone as it's aiding the performance of the bike ('55 ES2)?

What would be the negative effects of leaving well alone?

George

 

 

Re: condensation in fuel tank

Posted by robert_tuck at October 11. 2018

In cold weather and untill the motor is warmed up water vapour is visible  in the exhaust. White smoke after the motor has reached running temps can only be oil being burnt . If it only occurs after the motor warms up I would go for a bad exhaust guide bore in the head.

Re: condensation in fuel tank

Posted by mikael_ridderstad at October 11. 2018

Combustion of petrol produces water, carbonoxides and other things. When leaving the exhaust, water vapour can cool down and be seen as smoke.

Re: condensation in fuel tank

Posted by george_phillips at October 11. 2018

Nice one, Robert. Just what I wanted to hear!

Is there an easy way of checking for valve guide wear?

G

Re: condensation in fuel tank

Posted by robert_tuck at October 11. 2018

Its possibly some grooving in the head guide bore when someone knocked out a worn guide.   Try blocking off the oil feed to the head for a few miles. if the smoke stops you need to take the head off for a look see. If the smoke carries on look lower, piston rings etc. It could be a guide or seal.

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