XR250R with Supertrapp and 6 disks

cptarmy2002

Member
Dec 3, 2005
7
0
:think: :think:

Ok...bought a used 1986 XR250R with a Supertrapp (Muffler was worth as much as I paid for the bike)...it has 6 disks in it and I was wondering what a good start for the pilot and main jet would be?

Bike's not too worn...kicks over 3rd kick, doesn't smoke and runs strong enough but it's definitely running lean b/c it pops on decel...

Any help?
 

Ol'89r

LIFETIME SPONSOR
Jan 27, 2000
6,961
45
cptarmy2002 said:
but it's definitely running lean b/c it pops on decel...
Any help?


Before you start changing jetting, make sure the muffler is tight and sealing properly on the head pipe. An air leak between the head pipe and muffler can cause a backfire condition by introducing cold air to a rich unburnt mixture in the pipe. Also check the copper gasket where the head pipe bolts to the head.
 
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