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Well I have discovered a couple of holes at the bottom of each of the two mufflers on the 350. The are each about 8mm in diameter, however they look like they belong there, not just like somebody took a screwdriver to them. Are the holes supposed to be there? Will this have an effect on carburation, and high rpm performance?

Thanks Once Again!!!

Mufflers sometimes come with drain holes, to get rid of condensation. Don't sweat it.

ya no sweat, it for letting water drain out, well as far as i know. i have holes too, but its oil thats draining right now.

The CL350's did have small drainage holes to allow water to drain out.

CL's where on off road bikes so water was eminent at some point in these bikes lives.

Now the SL's where marketed as mainly off-road and had low mufflers with no drainage.

Go figure the thought on that one?

your still carbon fouling plugs?

How are your air cleaners? dirty air cleaners causes carbon on the plugs.

So does excessive idling, plug heat range to low, weak ignition system, & fuel/ air mixture too rich

All things I'm sure you’ve checked over and over!

Stick with it I'm having some of the same problems with my 73.

Mike

Well actually I'm not fouling plugs anymore but I'm running the 60 and 105 jets, so the smaller main jet, and now runs quite well. So should I just not sweat it that I'm using a smaller jet?

I wouldn't sweet it!

If the bike is running good and your not fouling plugs any more then the smaller jet size might have done it for you.

Now are you still having the dead throttle spot and the slow pull through the RPMs?

If so you might want to synchronize your carbs. I notice on my 71 after taking the carbs apart and giving them a good cleaning that I had similar problems.

Used that trick carb sync set up that Skier posted in General Maintenance & Appearance worked out real well.

Good luck!!!

and post back!

Mike