Scratching my head. Help before I find my gun.

Ok I bought my bike from a close friend. He had wire guy build him this set of cv34's for the motor and mods on the bike. But here is my problem

it will idle with the choke pulled and then slowly pushed in. But if
you go half way it act like it leans out. I pulled them off and all the floats are set just below the seal tops. About 1/4 to 1/8 inch. I have balanced the carbs and the timing is set
spot on. I took apart the pit cock and cleaned it out. And also I have tried running a direct line from the tank to the carbs.

Realy I have a 9mm pointed at it as I type. Help is needed.

And your jetting, pilot screw settings etc are... ?

Exhaust, stock or 4-1 header with pods....?

If fuel was allowed into the freshly rebuilt carbs without going through a good accessory aftermarket inline filter, the carbs may have been instantly re-contaminated.

Many perfectly clean carbs have been instantly fouled by an initial onslaught of grit-laden or otherwise cruddy fuel.

Good Luck!

Old Man Rock wrote:

And your jetting, pilot screw settings etc are... ?

Exhaust, stock or 4-1 header with pods....?

see sig for mods on my bike.

And we did put on a new filter. Wire guy sent a new fuel line and filter with the new carbs.

I say shoot it, but please post a video...

For a 750/4 with pods, a 4->1 pipe and Keihin CV34 carbs your jetting should be between
Primary Main 62, Secondary Main 135
and
Primary main 70, Secondary main 140

If your jetting is either of these or in between then it should run ok and you should'nt have the problem you describe. Otherwise I would think there is some internal blockage. Those carbs have some tiny passages that I've had to poke out with fine wire or nylon line.

Eldiablo wrote:

Ok I bought my bike from a close friend. He had wire guy build him this set of cv34's for the motor and mods on the bike. But here is my problem

it will idle with the choke pulled and then slowly pushed in. But if
you go half way it act like it leans out. I pulled them off and all the floats are set just below the seal tops. About 1/4 to 1/8 inch. I have balanced the carbs and the timing is set
spot on. I took apart the pit cock and cleaned it out. And also I have tried running a direct line from the tank to the carbs.

Realy I have a 9mm pointed at it as I type. Help is needed.

i think you mean wiredgeorge,wireguy is my alter ego! :laugh:

sounds like your problem is in the enrichner circuit. bad o-ring or just worn pistons who knows without seeing them personally

"it will idle with the choke pulled and then slowly pushed in. But if you go half way it act like it leans out"

I don't understand. If the engine is cold you start it with the choke on then move it to what ever position it idles without overrevving. Then when it warms up you turn the choke off. Why would you need to operate the bike at half choke if it idles ok with the choke off?

Am less suspicious of the carbs, because they were professionally rebuilt by WG specifically for this particular bike, and installed with a new inlne filter.

Assuming there's an ample supply of good fresh fuel in the tank.

If not already done, would now also consider battery, spark quality and compression testing.

Would next check battery fluid levels, re-charge it, and check specific gravity. Assure terminal connections are clean and snug, including negative cable attachment to ground at rear of engine.

Ignition spark quality --- would remove spark plugs and visibly inspect spark quality on each cylinder.

While spark plugs are out, would perform compression test. Remember to hold throttle full open during testing.

And install four brand new spark plugs. Guessing NGKB8ES but might be B7ES.

Given properly-timed quality spark and acceptable compression (with correct cam timing), plus ample clean fresh fuel flow into carbs, and clear free-flowing air supply, diagnosis might thereafter point to carb internals. However, I would remain exceedingly reluctant to disturb the rebuild settings as provided by WG.

Good Luck!