cool heads

[250R4Ever]

i'm thinking about running a cool head on my 85 250r, does anybody know what size dome to run? im running .010 over wiseco piston, sometimes change from race gas (108 octane) to pumped gas (93 octane)

[KASEY]

well the info you get when you buy it should tell you,, or the guy that sells it to you ,,,should know,,, i see mostly 20 and 19 cc domes on ebay too,,,,,,,

[bbechtel16]

Dumb question: What is the purpose of a cool head?

[TimSr]

It keeps you from making hasty decisions out of anger.

[MR ATC]

Dumb question: What is the purpose of a cool head?

it has better waterflow to circulate the water for better cooling. it also has differant internal head or dome shapes for more or less volume. you can interchange "sizes" or cc's

[bbechtel16]

Dumb question: What is the purpose of a cool head?

it has better waterflow to circulate the water for better cooling. it also has differant internal head or dome shapes for more or less volume. you can interchange "sizes" or cc's

So the as the volume size changes it changes the compression ratio right? Does it simply replace the stock head? How does it cool better, more colant capacity than the stock head has?

[85250Rfanatic]

How much doe cool heads cost and do they improve the performance :?: :?:

[CHAINSAW]

They improve performance to an extent. Im running a 21 now on around 108 octane. New ones run about $200 with 3 or 4 domes to choose from. I got mine of ebay real cheap (not sure why, must of just gotten lucky) they usually run about 120-150 on there. If you are a serious racer and want to get your motor dialed in perfect then they were built for you.
If your just a regular rider, do a little of everything, they really are not worth the money. Infact I might be looking to sell mine soon because Im re-porting n polishing and gonna have a factory head shaved and ported to match... (heheh factory look, but can keep up with powervalves)