CL360 running like the choke is always on, please advise.

MitchellHS

New Member
Hi all,

I have a 1975 CL360. It has a fresh top end rebuild, freshly adjusted valves, new plugs, common motor electronic ignition, stock carbs, stock airbox and filters, fresh battery, etc.

I am at 5000ft elevation, the jetting is:
35 idle
68 primary main
105 secondary main
Stock needle

I am having issues getting it to run consistently without fouling plugs in less than a mile. It starts first kick no matter what, but struggles to run and idle once it’s hot. It has very little power, and I can’t get it past 5000 or so RPM or 35 mph. It almost feels like riding a big scooter at this point. It did this before the top end rebuild.

I’ve gone through and fixed a ton of other issues on this bike, but this one has persisted through thick and thin. I’ve been through the carbs a few times already and didn’t see anything obviously wrong, but will have them off again shortly for another inspection and can post photos when I do that. The previous owner of this bike did a lot of “work” on it, and most of what I’ve done so far has been fixing his mistakes, but there are still a lot left. I’d like to have it running decently before I hunt down all the little things though, as not being able to ride it kills my motivation to work on it.

Other known issues it has:
-exhaust leak on the left cylinder
-ignition drops on one cylinder when you turn the bars to the right (throttle cables also get tight)
-some top end noise (not sure how much is normal on these bikes)


Has anyone experienced a similar issue? Is there anything obvious that I might have messed up to cause this?

Thanks!


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I FIXED IT!! If anyone’s having this issue, aftermarket carb diaphragms that were too floppy caused this issue. They were wide open from idle, dumping fuel the whole time. Swapped in some spares that I thought were bad because they were too stiff, and it runs alright now. Still a bit rich but it helped a ton.


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Never heard of that before and I've seen just about everything on 360's.
 
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