Modified Sport w/ stock carbs jetting

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gg883
Cucciolo - the Lil Pup
Posts: 19
Joined: Sat Feb 12, 2005 11:29 am
Location: San Jose, CA - USA

Modified Sport w/ stock carbs jetting

Post by gg883 »

My bikes motor was rebuilt by Jim Woods to 883cc with head porting modifications for 36mm carbs. Previous owner put stock carbs back on with no jetting changes and Bike seems to run fine with the stock 32mm carbs down low and midrange however at high speed when I apply full throttle the motor sounds like it is "pinging" and does not want to accelerate anymore so I have to back off the throttle until it smooths out again and then apply throttle gradually. This only happens at high speed top gear acceleration when full throttle is applied.

Someone told me this sounds like it is running lean on the main jets. I am running 125 mains in front and rear. Do you think I should go up in size? Considering my bikes larger displacement and modified heads do you think it may be starving for fuel at full throttle? Any recommendations?

Also, both my header pipes are very blue.
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