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Mikuni carbs on Honda CL350

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cl350 carbs
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8.4K views 28 replies 6 participants last post by  XB33BSA  
G
#1 ·
I know this subject has been beat to death but I need help with 30mm Mikuni carbs on my cl350. I know basically how the jetting should be done. Short history: got the carbs jetted like this: needle jet 159P5, jet needle 6F5 clip in center slot, slide 2.5, main jet 135, secondary jet 27.5, air jet 2.0. Bike is stock bore, electronic ign, cl pipes with shorty open mufflers, pod filters. When I put the carbs on, the bike would not run on main jet. Jetted up in steps to 180 mains and now is a little rich on top end but running pretty well, however it is missing and running lousy right off idle to about 1/3 throttle. I have raised the needle and changed the secondary jets in steps all the way up to 40's and still runs lousy (cutting out and spitting). I don't know what else to do except changing the needle jet and needle, but I don't have cubic dollars to throw at this project and would appreciate any advice.
 
Discussion starter · #3 ·
Yea, I put new rings in to start with along with a new timing chain set up. The compression is about 180 on right side and 175 on left side but I am about ready to believe the trouble is somewhere else but don 't know where it could be.
 
Discussion starter · #6 ·
Mikuni carbs on CL350

The carbs are Mikuni 30mm and ignition is electronic. What baffles me is the trouble is only in the lower throttle position. Most mechanical troubles would not occur only in this range. Bike runs very well at high RPM's.
 
Discussion starter · #22 ·
Well finally got my new jets and jet needles and stuff in to try the new set up on the Mikuni VM carbs. This setup is almost perfect! Runs great all the way thru the mid range and idles perfect. Feels a little rich on the top end but no spitting or missing just feels a little slow to accelerate. I will try a 195 main and see how it feels. I really appreciate all the help from you guys getting this bike straightened out. On another note, I have ordered some first over pistons and rings for the 1969 Yamaha R3 and will let you know how that project goes. Again, many thanks.
 
Discussion starter · #27 ·
Well after doing a plug chop, it looks like it is too lean so I am going to go to 210 mains. (yes I know I should try the 205's but I don't have them so I will try what I have and go from there.) The needles are in the highest position so bigger jets are the next option. If the 210's are too rich I can send for the 205's and play with them and the jet needle and get it just right.
 
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