WOW............... WELL THE BIKE RAN MUCH BETTER.. BUT STILL CUT OUT ALITTLE AT THE TOP END WHEN IT GOT WARM ......WHAT ADITIVES WOULD BE GOOD TO ADD TO A TANK OF GAS ???????????????THANKS EVERYONE FOR ALL THE INFO .......

if you are not running a power commander on a fuel injected bike, and you are doing all the things you said you did, you are running lean, sorry to say. think about it, would you expect a carbed bike to run the same, doing what you just did without rejetting it? i think not.

you need a power commander, a nice dyno tune from somebody like high deset dyno, and your bike will run so much better, you will not believe. if you think that you can remove the air box lid, (increase air flow) and remove the silencer (sparky, increase exhaust flow) and not think you are affecting the tune, well, its your bike.

the leaner you run a motor, the harder it runs. there comes a point in time where its too lean, and you are doing engine damage. such as melting away your piston dome, scorcing valves, etc.

dont be a tight wad, spend the money. get the power commander, get a dyno tune for what you have done, and your bikes engine will thank you.

ummmm..........

The LT-R was designed to be run exacly how he has it. The Cherry Bomb was designed to work with the stock pipe (silencer removed) and the air box lid removed. The CB richens the mixture and bumps the rev limiter. It should run perfect like this, I know mine does, as long as you use premium fuel.

Devin, if your bike is not running right, a PC will not fix it. You need to find out what's going on, before you start making matters worse! New fuel filter would be a good place to start, along with cleaning your air filter. If its still not right after doing these thing, put a new spark plug in it. MAKE SURE your always using top grade premium fuel! (Chevron or Mobil are best).

Let me know where you go from here...

I'm curious what kind of load it's under when running hot

if it runs fine till it gets hot, it's prolly run'n ok mixture wise.

never seen a 4 stroke bike overheat from being lean, have you? they usually just melt something!!!

In different air densities my YFZ is VERY tempermental and runs significantly warmer, generally there is a temperature difference to compensate so nothing goes kaboom. I'd imagine this tempermental nature would be overlooked on a FI bike because it adjusts a little here and there. If some part of this failed, we may be back to the same quirks of a carbed bike. I can't say this as a statement of fact, but I don't think it's an unreasonable thought.

EFI compensates for all of those things. If something is wrong, (failed sensor) he should have a check/warning light on. but mixture probs dont usually cause overheating.

since the fan blows hot air, im think'n the t-stat is stuck open. but i wanna know what the fan does...