3 & 4 Burn Black

[cberkeley]

Ok, have had the bike back from the shop a few weeks now (complete upper engine job). I find there's some backfire from the right exhaust when she's not fully warmed-up. The plugs read 3 & 4 burning rich (see photo). Is this just a matter of adjusting the float levels?

[t3rmin]

Have you seen this page?:

http://www.factorypro.com/tech_tuning_procedures/tuning_carbtune,CV,high_rpm_engines.html

It's a really fantastic methodical step-by-step for this type of thing.

[cberkeley]

Hmmm ...no I did not see it before. That's great stuff
Thanks, Cletus

[chef1366]

With fresh plugs do plug chops and find which circuit is running rich. Pilot circuit (closed throttle to just cranked), needle circuit(1/8 throttle to 3/4) or main jet (full throttle)