Heat Issues

I don't hear much about this being an issue for people, but my engine seems to have far more power when it is cool compared to when it has warmed up.

Especially after making a hard top speed run or going up a long hill I notice that my engine has very little torque, I'd say almost half. If I coast down a long hill with the bike out of gear, my power returns once I open it up again.

I would think that the problem is that the engine gets too hot so the air inside expands and makes the engine run rich. However, going to a smaller jet lowers my performance all around.

So I may decide to build some sort of cowling to get more air past the engine but what are some other ways to keep my engine running cooler?

Running richer will help to run cooler.
What gas to oil mix are you using?
You should be able to run your engine pretty hard without a power loss.

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If it ain't broke, and you mess with it long enough, it will be.

around 30:1 using amsoil interceptor. Running richer will help to run cooler but if it runs cooler it doesn't get rid of heat as efficiently, right? I would think that if your engine is made to run hotter (leaner) then it will cool faster.

When it has the bigger jet in it the power loss is more noticeable. With the smaller jet there is less power loss when it is running hot but there is also less power all around.

Btw would water injection into the carb help with cooling?

I think Joe is on the right track... Try going a little heavier on the oil mix & see if that helps.

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Prasinos , that theory may hold true for making ice cubes out of hot water , but if you wanna melt your motor by all means , the hotter the better .

Its always better to run too rich ( cooler ) than too lean ( hot ) , You want your motor to stay as cool as possible , and the cooler your motor is the higher your compression will be . If the air going into your motor gets expanded by the motor heat , then you get less expansion in the chamber after detonation also , resulting in less power

on my motorcycle , as opposed to hot humid days , on cold crisp days my bike feels like it has 10 extra hp , because the air going into the motor is cold

go with Joe and Venice on this one

I realize that it is better to run to rich rather than too lean, but if I am having a problem with over heating running leaner would allow the engine to put off more heat energy and would make the equilibrium temperature more constant.

First of all its not like i plan on burning hole in my piston, I check my spark plug often and even with the leaner jet it is still brown.

Second, the main issue is that my engine goes through a broad range of temperatures. The problem arises when the engine gets hot and starts running too rich, once it gets to this point it cant produce enough power to get a sufficient amount of air past the engine, so it just keeps heating up.

The bigger jet puts out more power when the engine is heating up, but once it is at temperature the power is less than the leaner jet running at temperature.

you cant deny there are diminishing returns with this, otherwise. If you want your motor to stay as cool as possible why would you ever go leaner?

let me know if anyone has any info on the water injection, also, I know increasing compression increases heat, but would removing my head gasket help with power anyway?

Running the engine lean will cause the engine to run hotter!! Thats just the way it works..

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For engine kits & bike service in Los Angeles, visit us at- www.VeniceMotorBikes.com

i never denied this fact venice boy i was just saying that running the engine lean also makes it run most efficiently at a higher temperature.

Just try adding more oil to the gas & tell us if that solves the problem... OK?
It's a real easy thing to try first.

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For engine kits & bike service in Los Angeles, visit us at- www.VeniceMotorBikes.com