I have a 91 cbr f2... bike starts up flawlessly only idle with choke applies even warm but any throttle after idle it either back fires or just basically dies.... it has full voltage at battery(stator new and works)... rectifier is new as well (blew them last season just put them in) wires in correct firing order. pulse generator tested good. I have spark at wires...

 

you NEED to clean your carbs. thats the primary reason it will only run on choke.

 

carbs have already been cleaned....

 

Have you fouled your plugs? Do your carbs have a jet kit in them and are poorly adjusted? To what degree where your carbs cleaned? Were they pulled out, bowls knocked off and every individual jet cleaned and the mixture screws set? Or are we just talking a can of seafoam or some carb cleaner sprayed in there. Are all the vacuum hoses hooked up correctly? Do you have good flow from your petcock on the gas tank with the vacuum line hooked up?

Answer all my questions and I'll probably answer yours

 

Don't listen to Elmer.....I have a crystal ball that can give you the answer....


Sunspots




(Elmer looks like he's got you pretty covered though...)

 

All The main jets and screws i could take out were all cleaned just brake cleaning thru them... My main jets have always been basically maxed out tight for some reason... how many should i back them out then? Last season was last time all carbs were synced 2gether, all vacuum lines r connected got flow from peacock

 

The main jets say 135 on them not sure if thats stock jet or not

 

I cant find how many turns out on the main jet if any? Pilot screw was off.... is that enough to cause my issue