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I have been fighting overheating issues with one of my 2 kdxs 220s. Both bikes setup the same except that the "problem" bike has flywheel weight and air striker carb. The other bike has no weight and OEM RBed carb. Jetting on both carbs are the same.

I rode the problem bike today without flywheel weight as well as switching the carbs. It did not loose a drop of fluid.

Is it possible that the weight and/or carb difference could cause the bike to overheat? Or is this just a stupid coincidence? It was cool today. Temps were around 55 degrees. The riding was pretty fast and only did one difficult hillclimb.

So what do you think? I plan on riding the other bike next weekend with the air striker carb to see if it starts having temp problems.

Thanks for your time, Steve

I'd check to see if the radiator cap is the culprit first, since it's the easiest thing to check out and is also a usual suspect. Swap 'em between the bikes and see what happens. Make sure the gasket seals well on a clean surface. I'm running a flywheel weight and it does not affect overheating.

ditto on the Rad cap. I annoyed the folks on this site for weeks with my overheating problem. I ended up switching to a 1.6 atmosphere cap, but I bet a good stock one would have worked fine.

If the cooling system can't pressurize, it makes steam. If it makes steam, hot spots develop in the head and it makes more steam. This makes more hot spots quickly, and you get a volcano.

The real reason for pressure is due to the fact it raises the boiling point of the coolant.

Both bikes have new OEM rad caps so dont think that is an issue.

I really like the flywheel weight so glad to hear that likely it has no effect on over heating.

Any other input?

check timing

Great idea. Did not even think of that. Awesome.