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Subject: Backfiring bike
Replies: 12 Views: 595
rynop 23.10.08 - 07:06am
I recently put a shorter exhaust on my 125 bike.but now it backfires quite a lot on engine braking?is this normal?its a new bike * +
hcd67 23.10.08 - 08:14am
Cnt see a prob racin bike n car bak fire * +
o..o 23.10.08 - 09:35am
could be valve clearances,or needing re-jetting to suit the new exhaust. What sort of bike?how many kms or hours it got on the motor? * +
o..o 23.10.08 - 09:37am
also as a diagnostic test,put the old exhaust back on,if the problem stops then it's most likely a jetting issue * +
rynop 24.10.08 - 10:13am
Can it be to small valve clearence?it did backfire with the old one as well.just softer. * +
rynop 24.10.08 - 10:14am
O yes,it has only 2000KM * +
o..o 24.10.08 - 10:47am
unlikely that the valve clearance is too small,as motors wear,the clearances increase. You could maybe try an adjustment of the air/mixture screw on the carburettor,most bikes will have them and it's often never checked.. It will be a bra55 colour,plain screwdriver type,small screw,possibly just near the idle screw,wind it all the way clockwise till it's fully closed,then back it out 1 full turn- * +
o..o 24.10.08 - 10:54am
-then another half turn,1.5 turns out is a pretty standard setting. If that fails to have any effect,you could try lowering the needle one step if possible,the effect will be to lean the midrange a little,the needle is found in the centre of the carb slide,they usually have a range of slots with one circlip that determines it's base setting,raising the clip to a higher slot will lean the mixture- * +
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