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redrider05
09-13-2006, 06:53 PM
hey guys i was wondering how everyone was liking the cp pistons as far as quality,availibility and does anyone know what compression ratio's they come in?
GPracer2500
09-13-2006, 07:12 PM
CP has an excellent reputation. 04/05 450r stock bore shelf pistons come in 11:1, 12:1, 13:1, and 13.5:1.
cals400ex
09-14-2006, 12:08 AM
i have ran two somewhat custom CP's in my 450 and i have been really happy with them.
400exrider707
09-14-2006, 09:39 AM
Originally posted by cals400ex
i have ran two somewhat custom CP's in my 450 and i have been really happy with them.

define "somewhat custom"
cals400ex
09-14-2006, 02:25 PM
lol, i knew that was coming. the first piston was a 12.25:1 HH piston. the second one was a 12.25:1 BW piston. they have a few performance enhancing characteristics. the flow paths were modified, both have fit over sized valves, the HH had underdome milling and lighter piston pin, the BW had a moly coated piston skirt, low friction hardened rings, the HH had only one compression ring instead of two, lateral gas ports, custom squish, etc. heck i can't remember all the details on these pistons.
450r51
09-14-2006, 02:26 PM
do they have a website? ive been looking for a good quality piston that will last.
fandl450r
09-14-2006, 02:40 PM
They also make a 14.1 piston ;)
GPracer2500
09-14-2006, 03:29 PM
CP Pistons (http://www.cppistons.com/)
redrider05
09-14-2006, 04:07 PM
sweet...i was looking for a piston company selling a 12-1
stocktires
09-15-2006, 09:06 AM
13:1 seems like the best bet, a stock crf piston is a 12:1 (04' and up) and should bolt right in.
ghott
09-15-2006, 10:29 AM
I've heard of some poor machine tolerances from CP. I know a sponsor over at the .Org has used about 40 different CP Pistons, and he had stated that every single one was a problem child.

Jusy FYI.
chad502ex
09-15-2006, 01:13 PM
cp pistons are IMO very nice.

what makes a piston preferred is the forging process.

Personally, I'd take a forged piston over billet anyday.

Forged pistons are better at retaining oil....
tltcracing
09-15-2006, 03:41 PM
i see they offer a 13:1 and a 13.5:1. what would be the difference other than the obviouse* compression differences. is the 13:1 more reliable then the 13.5:1? what would you recomend for a MX only quad?
chad502ex
09-15-2006, 08:32 PM
Originally posted by tltcracing
i see they offer a 13:1 and a 13.5:1. what would be the difference other than the obviouse* compression differences. is the 13:1 more reliable then the 13.5:1? what would you recomend for a MX only quad?

the 13.5 is the race version with dual wrist pin oilers, lateral gas ports, anti detonation groves, coated skirts.
chad502ex
09-15-2006, 08:34 PM
from underneath..

observe the gusseting- shaweat!
czrider263
09-21-2006, 09:14 AM
Nice looking piston. Is that the one i saw at your house going into your next special drg build lol.
chad502ex
09-21-2006, 09:28 AM
shhh.. hehe...

nice avatar..
czrider263
09-21-2006, 11:33 AM
LOL THANKS

made sure it was one you wouldn't mind..

don't want to show off that amazing porting to much.