Hey Guys, been lurking for a while and soaking up as much as I can from all the helpful wrenches in here. Hopefully someone can aim me in the right direction with this problem.
Last summer my son comes home from school looking to build a cafe racer. He found a CB360 runner that needed some love (and a lot of chopping) and it came with a CL360 basket case for parts or... Since I like to turn a wrench for fun I thought it would be cool to give this a go, so we went at it. Things went along ok for a first project. Not quite the quality of the bike I see here, but the boy has to learn, and we can always tear it down and clean it up some winter.
On to the problem: The with a set of shorty pipes and Pods (I know what you are thinking, but the kid wants that look) the bike would start and run at 3-6k rpms ok for a while, but wouldn't idle. I saw someone went to a bigger main jet and it helped, so i have a 115 main and the stock 68 secondary. Now it will only start and run with the choke on. But the bigger problem is we have noticed the right cylinder is dead cold. It is pumping air like a champ, but not hot exhaust.
I have checked compression (135 left, 140 right, cold). There is spark when I pull the plug out and kick it. I checked the points and re-gapped. I have cleaned the carbs about 4 times in the last few days. There is plenty of fuel flowing from the tank to the bowls. Since I dump a shot of gas from each every time I take them off the bike.
New plugs installed: Left plug is black, right plug is dry with a touch of black on it.
One thing I noticed is when I took the air filters off, there isn't any suction on the right carb mouth, certainly not as much as the left. So i am thinking either timing or valves. There is some sign of life in the Right side when i shoot a little starter fluid in. One more thing... i have tried the air screws at 1/2 turn out, 1 full turn out and increments of 1/2 to 3 turns out. No luck.
So, gentlemen... what am I missing? And be gentle, this has been driving me nuts for a few weeks. Thanks.
Last summer my son comes home from school looking to build a cafe racer. He found a CB360 runner that needed some love (and a lot of chopping) and it came with a CL360 basket case for parts or... Since I like to turn a wrench for fun I thought it would be cool to give this a go, so we went at it. Things went along ok for a first project. Not quite the quality of the bike I see here, but the boy has to learn, and we can always tear it down and clean it up some winter.
On to the problem: The with a set of shorty pipes and Pods (I know what you are thinking, but the kid wants that look) the bike would start and run at 3-6k rpms ok for a while, but wouldn't idle. I saw someone went to a bigger main jet and it helped, so i have a 115 main and the stock 68 secondary. Now it will only start and run with the choke on. But the bigger problem is we have noticed the right cylinder is dead cold. It is pumping air like a champ, but not hot exhaust.
I have checked compression (135 left, 140 right, cold). There is spark when I pull the plug out and kick it. I checked the points and re-gapped. I have cleaned the carbs about 4 times in the last few days. There is plenty of fuel flowing from the tank to the bowls. Since I dump a shot of gas from each every time I take them off the bike.
New plugs installed: Left plug is black, right plug is dry with a touch of black on it.
One thing I noticed is when I took the air filters off, there isn't any suction on the right carb mouth, certainly not as much as the left. So i am thinking either timing or valves. There is some sign of life in the Right side when i shoot a little starter fluid in. One more thing... i have tried the air screws at 1/2 turn out, 1 full turn out and increments of 1/2 to 3 turns out. No luck.
So, gentlemen... what am I missing? And be gentle, this has been driving me nuts for a few weeks. Thanks.
