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General => General Discussion => Topic started by: vermi on August 18, 2010, 05:52:39 PM

Title: My exhaust make a PFFFFT !???
Post by: vermi on August 18, 2010, 05:52:39 PM

When i drive my People 4 stroke and the motor is cold, my exhaust make a PFFFT everytime i slow down!?
It's same of a backfire but no detonation, only a PFFFT.

After 5 minutes of running (when the motor is hot) he stop to make this PFFFT and everything is normal ???

I check the spark plug, is not lean.

What can make this when the motor is cold???

Thank'S!

Title: Re: My exhaust make a PFFFFT !???
Post by: art on August 18, 2010, 06:55:51 PM

 May need to worm your bike up a little longer,your choke may still be enguaged when you take off,so you may actually be a little ritch in this case.

Title: Re: My exhaust make a PFFFFT !???
Post by: wordslinger on August 18, 2010, 10:21:41 PM

..that would be my guess...

..my pilot jet in my oem A50 card is too big...

..(i drilled it too big during one of my experiments)..

 :-\

..i get the same thing when i slow down..but, all the time...

Title: Re: My exhaust make a PFFFFT !???
Post by: vermi on August 29, 2010, 07:22:23 PM

I put back the original muffle and upjet the pilot jet #35 for the #38.
Everything is ok now!

Title: Re: My exhaust make a PFFFFT !???
Post by: art on August 29, 2010, 08:01:56 PM

 Hey vermi I just re read through your posts again I was thinking you might want to raise your needle jet a little bit and try the other pipe again.