Head Job For A 250R

[PYF]

I recently tore apart my R to rebuild my main bearings and seals but since it's already tore, I will change the piston/rings and some others bearings. I will as well give a little ''treat'' to my cylinder/cyl. head... A porting/milling job

My question is about that. I was wondering about something...The 250r Compression ratio is 7.7:1... Would bringing it to about 10:1 (If it's doable)(Like a 250 mx bike) + a mild porting job bring the HP to a realistic mid-40 hp's?

Seems realistic since a 250 MX bike have about 50 hp. Don't know if it even have sense since I'm not an engine builder myself so I'm not sure if everything I stated is doable...

I'm still asking since there are a lot of knowledgeable people around here....


Thanks a lot in advance

[Zedicus]

take the stock 250R headgasket and seperate the 3 pieces and just use one of the outer pieces as yur head gasket. a good port matching/ more power everywhere port job helps a lot too... you can mill the head along witht he gasket trick just watch yur compression, get much over 180lbs and u need to go race gas. i dunno bout actuall hp but i would imagine u could get over 40.

[PYF]

Originally Posted by Zedicus

take the stock 250R headgasket and seperate the 3 pieces and just use one of the outer pieces as yur head gasket. a good port matching/ more power everywhere port job helps a lot too... you can mill the head along witht he gasket trick just watch yur compression, get much over 180lbs and u need to go race gas. i dunno bout actuall hp but i would imagine u could get over 40.

Thanks a lot

Though I could get as high as 190lbs before using race gas...Oh well

[Zedicus]

its possible...depends on the quality of the pump gas, if u can get 93 oct it would prolly be fine on the low side of 200...

[PYF]

Originally Posted by Zedicus

its possible...depends on the quality of the pump gas, if u can get 93 oct it would prolly be fine on the low side of 200...

Thanks again