[kbittle2]

I am interested in getting a 12:5 to 1 high compression piston and a stage 3 hot cam installed on my 700!! Just looking for feedback or thoughts (good or bad) before i pull the trigger. Example: Gas, other motor work or other parts I would need to install. From looking at all the posts I think I'm in the right spot to get good advice. Thanks!!!!!!!!

 

[boost addict]

With a 12.5:1 piston you are going to need run race gas(cam2 or C10).The hc 3 is a very mild cam, so no need for springs or hardwelded rockers. You will also need a pc3 or pc5 for tuning IMO.

 

[EHSRACING]

rockingham, ?

 

[Britalican]

the 12.5:1 piston wont get u much extra unless u do a lot of other mods. just going to make u have to run race fuel. go with an 11:1 piston unless u have plans to do some port work and better cam, springs, rockers in the near future to get the full potential of the piston.

 

[08700xx]

What mods do you have right now? I was told with 12 5 1 you can get away with 100 octane but they recommended 110. I'm at 12 1 and I run VP C12 with my build. Like Britalican said it just depends on what you want out of it and how much you are willing to spend on fuel. I heard the HC3 works pretty good for the price with stock heads but Web cams work a lot better in ported heads, I would get a +3 throttle body with the cam and piston.

 

[kbittle2]

My current mods are are only fmf exhaust and programmer and K&N air filter. Not really worried about how much i spend on gas. Just looking to get a little more power overall but I dont want to pour 2000 dollars or more into. I was told i could get the HC piston and a cam for for about 350 and get it installed for about 250. havent priced the springs or rockers. looking to keep the price parts and labor under 1000. Yes I am from rockingham, nc

 

[700Xxrida]

how can the stock high performance dirt bikes run such a high compression ratio on pump gas
13.2 to 1? http://powersports.honda.com/2011/crf250r/specifications.aspx

 

[crisco]

all depends on cam profile, head design, true compression ratio, etc.