much searching, no synching!

have been pouring through the info I can find on here aboutcarb synching. have found some usefull stuff, but nothing thats jumping out at me.

have stock motor, pods, 4-1, VM28's

have moved the mains to 115's, air 2 turns out

trying to get it synched, but its not workin out very good for me. I have 2 books, and one says 12-16 inHg and the other says 20-22 cmHg. at either level, things just ain't right. the bike runs, but its kinda dog like. slow, but smooth acceleration up to about 5000rpm. and then it tries to pick up fairly decent after that. still not as it should be though. begining to feel like a small hammer to my big head.

should I go bigger on the mains?

also, the 2 hoses that come off the carbs just above the carbs, should they be blocked -off(plugged) or looped to each other, or just left open?

Help!!!:blink:

Can't begin to help without knowing what type carbs are being asked about. You might put your bike year/model in your sig as well.

74 Z1 with a 76 KZ900 motor. VM28 carbs. they had 112.5 mains in em, went up to 115's

MadKaw500,
Conservative = CHOICE to be made by the individual(gun ownership, school vouchers, etc.)

Liberal = CHOICE as long as the liberal in charge decides what choice will be made (no guns for anyone, no competition for tax dollars to improve public schools, etc.) Perhaps we should refrain from putting our political opinions in this forum, but I'll let you make that choice for yourself.

Ed

Ditto!!! Thanks, Ed.

"also, the 2 hoses that come off the carbs just above the carbs, should they be blocked -off(plugged) or looped to each other, or just left open?"

Not sure which hoses you're referring to but they are not to be left open.

Loop em or plug em. And what George says!

KZCSI

You need to compression test that bike. If it has worn or broken rings and low comp, it's going to be a dog. The air screws should make the motor run good starting at 1 turn out to 1 and a half. Two turns out is too much. You need to know the comp, in combination with wether it's running lean or rich before you go to the carbs,if comp. is low check and set valve clearance first. Then check ignition timing. Take it from there

KZCSI wrote: ""also, the 2 hoses that come off the carbs just above the carbs, should they be blocked -off(plugged) or looped to each other, or just left open?"

Not sure which hoses you're referring to but they are not to be left open.""

There are no smog stuff on a either a 74 or 76. The only hoses on the top might be the vents which should NEVER be plugged. See our website for VM carb connection pics/directions under wg's Tech Stuff Index.

There are various types of VM28s. Are these 74 VM28SC? I can't really help unless you get more specific. There were 28s on the Z1 73-75, Z1R 78, VM28 w/pump on KZ1000 (various models) 79-80. The jetting on all types of VM28 were different.

MadKaw500 wrote:

have stock motor, pods, 4-1, VM28's

have moved the mains to 115's, air 2 turns out

the bike runs, but its kinda dog like. slow, but smooth acceleration up to about 5000rpm. and then it tries to pick up fairly decent after that.

also, the 2 hoses that come off the carbs just above the carbs, should they be blocked -off(plugged) or looped to each other, or just left open?

Have you tried it without the pods? Some pods block off the small ports at the mouth of the carb. Two turns sounds a bit rich but you might try moving your clips up a notch first though.

Does the bike pop back any? (Exhaust backfire or carb spit?)

Try rolling up on the throttle several times but stay below 5k on the tach then hit the kill switch and dump the throttle. Check the plugs and see what you find.

The above is assuming you have checked the valves and done a compression check, if not do those first as the rest means nothing unless the bike is in good shape in those areas. Might not hurt to check your coils too for weak supply voltage or other issues.

Best of luck to you!

I'll try the chop test and the compression tests, butit ran really good above 500rpm's.


and I love stirring up the political pot...why is that such a taboo along with religion? I could have just as easily wrote my sig. the other way, I think both labels are wrong thinking. its like deciding your answer before you even know the question.