I would re-jet the bike - it will run cooler -
you really don't need no stinking kit - just a 150 or a 152.5 main jet, a little less spacer, pull the plug over the idle mixture screw and gently close it (clockwise) and bring it back out 1.5-1.75 turns and your good to go

Paula71 wrote on 12/31/69 at 16:00:07:


First, why is your denim touching the engine?  Is it REALLY scorched is that just figurative?  Usually you can feel heat radiating off the engine in hot summer traffic, but you are still a long way from spontaneous combustion.

Second, "lean" is not a condition that developes with miles.  You can change the jetting if you want to modify the performance of the engine, but it isn't mandatory for any stock bike.  Also, if you consider that various parts of an engine are running at temps of several hundred degrees, you will understand that you will get burned even if you change the jetting....what is a just few degrees to an engine will still inflict a 2nd - 3rd degree burn on you.

Okay, back to "jeans on fire"....all our bikes are essentially the same and the only way that I have been burned is by direct contact with the wrong part.  Let me ask, do you ride with your legs tightly clamped on the gas tank?

Paula71 wrote on 12/31/69 at 16:00:07:


Paula, you need to understand that I don't know how this can happen.  I understand that you scorched your jeans, but I don't understand how.  Not by just riding normally (the same as I do)  

Jetting will not appreciably change engine temperature to the point that you can not scorch your jeans, because you still have internal combustion going on regardless.

So, what is different, missing, wrong, or changed on your bike?  Do you have an exhaust leak, a missing heat shield, a different muffler or head pipe?....That is what I am saying.

Anyone else with any ideas?

This is truely curious.

Very recently, like yesterday, I experienced a hotter than usual right lower leg while riding. However, did not burn the jeans.  My problem was caused by a loose muffler clamp and was solved by tightening the clamp.

It seems to me that it would be possible to burn your jeans if the inside lower leg part of the jeans rested against the crankcase for a period of time.  You could test this by simply securing a small bungee cord around the bottom of your jeans so as to keep them away from the crankcase.  I think I would also check to see that there is the adequate amount of oil in the engine.

Wow, this all just sounds freaky to me.  I've never noticed that much heat coming from the engine or exhaust on mine.

WD wrote on 12/31/69 at 16:00:07:


First, if you were wearing rain pants, was it raining?

If it was raining then why didn't the water prevent the fire?

Savage_Greg wrote on 12/31/69 at 16:00:07:


No loose muffler clamp , no obvious problem, other than extreme heat radiating away from the bike. The place on my jeans that has been scorched 2 times is directly across from the cylinder head, And I can not make my leg touch it .  Lucky you for never experiencing this before, I know several others that have not experienced this either. I am not imagining this , and yes I too think it is very Freaky

I rode a dirtbike before street bike and never had this come up then either.