atc 250r head gasket

[william16339]

i am doing a complete rebuild top and bottom on my 85 atc 250r. i am getting the CYL ported, getting a 38 mm carb, boyesen power reeds, has a pipe and silencer on it, should i run a cr 250 (1989) head gasket on it? thankyou i know after 200 psi i need to run race fuel, and i dont want to lol...so help me out please thanks

[RIDE-RED 250r]

If you don't want to run race fuel, then skip the high comp head gasket mod. It WILL get you into race fuel territory, at least 50/50 mix anyway...

BTW, what kind of porting are you looking at?? Low-mid, mid-top, drag??? The power curve you desire will dictate what porting and supporting mods to go for...

[william16339]

i got a deal for 150$ at flowtek and its a midrange kinda porting...i thought everything midrange, and a topend carb

[william16339]

i do alot of trail riding..but i do drag with my friends....i am alot faster than my friends 250r and his has more mods...idk whats wrong with my trike lol like i said..but i want to really hang with this guy on his banshee..never raced him though

[william16339]

should i do a comp test befor cr 250 gasket, see ware its at, and if its below 200 put the cr 250 one on, do a comp test and see if its under 200? or no? i really want to run it...but dont wana run race fuel, even if its 50/50

[RIDE-RED 250r]

If you don't want to run race fuel, skip the CR gasket. Generally speaking, yes, 200psi and up is race fuel time...

And your buds 250r with "more mods"... Just piling on mods doesn't necessarily mean it is going to work. You have to decide how you want your engine to run and build it to do just that. If you want top end, bigger carb, no reed spacer, mid-top porting and a rev pipe.

If you want low-mid, go high compression, reed spacer, low-mid porting, midrange pipe, and a bit smaller on the carb.

It's not about how many mods are thrown at an engine. It's about the right combination of mods and porting.

And I have to add, having a slightly bigger carb than what is considered ideal isn't going to hurt you that bad. But it will have some effect. I ran a 38mm A/S on my engine that was stock porting, but had other bolt-on type mods for low-end and midrange. And if you think that old setup was slow in up top I have news for ya. You could just tell the meat of the powercurve was in midrange

[william16339]

i here ya. you have to set it up one way or the other