Exactly, if you really want to run race gas, you can buy a cr250 gasket, then tear it apart so you only have ONE metal peice (you probably should call a motor builder like MP racing, FTZ, or similar and see what year of gasket to buy) This will raise your compression.. right now my neighbor is running 225lbs compresison on his 310 race motor, he Should be running 110 octane race gas, but he gets away with 92 with 108 octane boost. His 250 jug makes 215lbs compression which requires about 100 octane.

 

how is the reliability on that 310 with the 225lbs?

 

I have a question for HA2, did you steal that ID from the clutch of your 250r? I had one apart the other day and saw a HA2 on the clutch plate or basket and thought of you [img]i/expressions/face-icon-small-happy.gif[/img]

 

LOL. HA2 is the prefix in the majority of the parts numbers for my bike i believe. hence the birth of my name [img]i/expressions/face-icon-small-wink.gif[/img]

 

oh i didnt realize....u didnt have to take offense to it man!

 

Haha, none taken! And I wasn't in a very good mood when I replyed at that moment. My Bad for acting like a moron.

 

by the way,a cr250 head gasket is a one piece thin metal,the trx is 3 piece. im out[img]i/expressions/face-icon-small-happy.gif[/img]

 

At what compression is required for race gas or higher octane??

 

hey 86,

Is race gas REQUIRED with the CR one piece thin gasket?

Im cloudy on this issue, 185 psi and up needs race gas?????? or is it over 200psi

 

mine was at 188 when assembled with the cr250 gasket,no head machining.i ran 94 octane ....no problems,now its at 175 and getting close to rebuild time.machining the head this time or cool-head ,not sure which.i will be running 106 turbo blue unleaded after that.