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whiff of smoke when backing off the throttle?

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Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 ·

#590721
when i back off the throttle in my baja (when operating the throttle lever on the carby) you get a short whiff of smoke, it doesnt blow smoke when u put ur foot down but if u back off quickly u can see a bit. is this just unburnt fuel? shouldnt it smoke when u accellerate not the other way around?

rich mixture?

tappets maybe? (though i did them recently)

Nicko
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom

lexm Commited Dubber

57 posts · joined Apr 2004 ·

#590734
Worn valve guides or valve stem seals (not sure what's in a vw).
Closing the throttle at speed creates vacuum in inlet manifold and sucks oil down past the valve stems.

[ Edited on 10-5-07 by lexm ]

greedy53 Bishop of Volkswagenism

3,062 posts · joined Mar 2006 ·

#590752
not a worrie when you back of and valves and things go out well could be a prob but now will run forever if your really worried using one of the oil additives that add a coating for wear would be ok
👍👍😂🙅🥷😬🤓

VWCOOL 23 Windows of Awesome

5,158 posts · joined Jun 2003 ·

#590788
lexm wrote:Worn valve guides or valve stem seals (not sure what's in a vw).
Closing the throttle at speed creates vacuum in inlet manifold and sucks oil down past the valve stems.

[ Edited on 10-5-07 by lexm ]
yeah, that's it. But no seals required in a VW as the valves are installed facing 'downhill'
Pay your debts, CxxT

Anthiron The Baja Rejuvenation Begins

4,936 posts · joined Oct 2003 ·

#590853
hmm, ok, not a huge issue atm?
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom