1990 zx750-F4 Carberator questions
 

I have no manual for my bike and was wondering how to properly clean and sync the carbs.

Hmmm, without the manual it could be tougher, best thing I can suggest is to get the parts fiche to reference on the tear down.

Welcome to KF!

A carb is a carb, and welcome to KF.

Cleaning is all the same, it is the adjustments that may make one carb more picky than the other.

Keihin, CVK34
Main jet 112
needle N531
Pilot 2 turns out
float height 17mm
idle speed 950-1050 rpm
synch less than 2cm hg

Thanks for the welcome. I used to be on here a while back, but totaly forgot my password, and email and hard to start all over. That bites, but hey......I'm glad to be back. And thanks for the info.

Welcome back then!

I don't know if you just don't want to get a manual or what but clymer i believe is the company. I bought one for my 93 zx7 and its worth its weight in gold. with shipping and all it cost less then $40. Just google 1990 zx750-F4 manual and it should give you a few choices. took about a day for me to find the cheapest one. bike bandit i think is where i got mine from but anyways check it out it's deffinitely worth it though in my eyes.

Thanks much guys. Yup i was trying to get it without paying for it. Bad economy, laid-off, money's tight....lol. Any, i ordered one :) Waiting on it now. Maybe i'll tear the bike apart now. My 1990 zx750-F4 has 42,036 miles on it. It's time for a tune-up.

I have cleaned them twice and i am having issues. It's like as if #3 cylindar isn't getting gas. or else it's my timing chain skipped a tooth or two. IDK. serious issues now. bike barely idles and chokes out at 4000rpms

Are you getting good spark? Any of the plugs wet/fouled? sucks when the easy fix doesnt work :(

I have pulled plugs and they r dry. I have checked spark and it is strong. I have changed plugs. The bike runs like crap and misses really bad with the choke on. Once warm i can turn the choke off and it still runs like crap. Then when i try to give it gas...........if i do it slowly i can get it to about 4000rpms and then it dogs and bogs out. tries to die. If i try to snap the throttle......it chokes out.

Someone told me timing might have jumped. IDK because i took the valve cover off, put the 1 and 4 to TDC and the notches on the cam gears line right up.......unless they marks don't mean anything.

My rockers are adjustable and seem quite sloppy but i don't know the specs for the amout of valve lash i need. Loose crappy settings on that might cause the issue also. IDK. I just don't have the cash to afford to pay the shop to fix it. 120 dollars an hour and it's the only shop around here.