1968 cb350 w/Mikuni vm32 jetting issues

S

shuggs

New Member
New to forum...recently acquired 1968 cb350 with Mikuni vm 32 carbs. Will not idle. Will die if not given gas. Bike jolts hard in first and second gear with minimal throttle... Played with jetting and mixture. Now, the Main is at 150, Pilot is 30, needle clip position second down from top. Air mixture screw is at 2 1/4 screws out. Pod filters, open mufflers. Runs best when cold outside. Throttle can stick at high rpms and has tendency to rev higher when front wheel turned from side to side. The throttle cable is not caught on the tank, yet it still does have this affect when bike is turned from side to side. As it is now, the plugs indicate that it is running rich.

Any help with jetting and getting this bike in good running condition would be of great help! Very much appreciated.
 
DrJ said:
28mm is plenty for stock street use.
Click to expand...

This.

You'll never get a stock 350 motor to run 100% "right" with 32s. You'll always be chasing power and delivery somewhere.
 
There right the cm32's are hard to get right on a stock or even a midly modded motor. get some parts for performance get to breath a little better maby a cam or pistons then u can run the 32's and get them running correct. The cm30's are designed to run on a stock motor but if u all ready have the cm32's put the aside for later and run stock carbs till you get some performance engine parts.
 
Fix the other issues before you get hurt.
Sounds like throttle cable isn't routed right or damaged, it's too rich plus god only knows what else is wrong?
32's are too much for anything but full on race motor, 26's will work to about 110~120mph (BTW, stock carbs are 26mm venturi CV, CB360 has 28mm venturi )
 
I always say this on CB350 carb threads: Unless it's a race bike stick with the stock carbs. They are very forgiving especially if your average riding is street. If you want a round slide carb, get a set off of an SL350. They were made to work with that motor. You'll have to tune them a bit to bring out the top end but they are at least a better match from the start then the VM's.
 
Problem with getting SL carbs, they cost about the same as VM and you may still have o re-build them.
It's unlikely you can find a pair for less than ~$125.00 and they often go for $200.00 plus (according to a friend who has some and checks it out frequently)
If JBM Industries don't do a $20.00 diaphragm, long term it's cheaper to fit VM
 
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