Back Fire Problem

[jshprt]

I am currently using new hgm carbon fiber shorty big elbow. I have an all stock engine. I always experiencing back fire. what should i do?

 

[john_carlo]

try to adjust a/f mixture... or a rejet on the caRB
OR try this
http://www.yamahat135.com/threads/h...or-better-performance.4638/page-5#post-479822

 

[jshprt]

is rejetting the carb the carb the carb the same as tune up? the link that you gave, is it safe and compatible to stock engine? how about exhaust gasket? does yamaha s3 shops fix this kind of problem?

 

[marulas4kasridersclub]

adjust A/F mixture i also use hgm big elbow pipe... stock engine

 

[jshprt]

what's your current a/f mixture?

 

[marulas4kasridersclub]

what's your current a/f mixture?

i just turn it clockwise about 1/4 turn ... then backfire is gone

 

[jshprt]

1/4? is that enough? 1 turn is 360? so just 90 deg turn?

 

[CLYDE]

1. Change Mainjet to 107.5
2. Adjust A/F to 1 and 5/8 turns
3. Make sure that your exhaust is bolted well to the head (replace exhaust gasket if necessary)
4. Condemn AIS
5. Change CDI to BRT
guaranteed no backfire

 

[jshprt]

1. Change Mainjet to 107.5
2. Adjust A/F to 1 and 5/8 turns
3. Make sure that your exhaust is bolted well to the head (replace exhaust gasket if necessary)
4. Condemn AIS
5. Change CDI to BRT
guaranteed no backfire

1) How much is the mainjet? is it available at yamaha s3?
2) 1-5/8 turns i'll try this tomoz
3) ok tomoz
4) ok tomoz
5) If i'll change my cdi what else should i change? or is it ok if just the cdi