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View Full Version : benefits to gas ported piston?


Batavia's450r
06-01-2007, 10:07 AM
do they make a gas ported piston? i have a sponser threw wiseco called them they said they didnt make one but they can do it to the 12.5 to 1 piston we ordered for the ex so thats whats theyre doing now...
i run a gas ported 13.5 to 1 in my R and it seems to run very nicely with it i also run gapless rings is it a good idea to do this on the ex? just with normal rings my builder said not a bad idea
zrpilot
06-01-2007, 01:51 PM
What? Are you thinking the 400EX is a two-stroke? I have never seen a gas ported piston in a 4 stroke... but then I could be wrong, after all thanks to GPracer2500 I would have never thought there would be reeds in a four stroke...
GPracer2500
06-01-2007, 07:33 PM
Most likely he's talking about lateral gas ports. They are a piston feature that improves ring seal.

http://www.racetep.com/carpics/jeoptions.jpg
Batavia's450r
06-01-2007, 07:36 PM
yes is this something that i can benefit from in the ex
Dill
06-01-2007, 08:46 PM
I have an aftermarket VR piston (CP custom cut) in my YFZ. The oil ports really help in oiling the wrist pin for longer life.

If given the option, I would have both done on any piston I installed.
j450rking
06-01-2007, 09:50 PM
4 strokes have reeds!?
TYayo420
06-01-2007, 09:52 PM
i never heard such a thing on 4 strokes either lol
procircuit406ex
06-01-2007, 10:27 PM
Yep.

http://www.exriders.com/vbb/showthread.php?s=&threadid=294025&highlight=trivia
Dill
06-01-2007, 10:59 PM
Originally posted by j450rking
4 strokes have reeds!?

who said that?
Sparky_20
06-02-2007, 12:08 AM
that seems like a pretty good idea if your racing only. I might just go with total seal rings tho...its your choice
flauge
06-02-2007, 07:36 AM
Ive seen something mentioned about gas ported pistons on chad502ex's website. maybe he might give us some info on it...:cool:
j450rking
06-02-2007, 07:56 AM
Originally posted by zrpilot
What? Are you thinking the 400EX is a two-stroke? I have never seen a gas ported piston in a 4 stroke... but then I could be wrong, after all thanks to GPracer2500 I would have never thought there would be reeds in a four stroke...


i don't think there is reeds in a 4 stroke
Sparky_20
06-02-2007, 09:13 AM
there are definately not reeds in a thumper
GPracer2500
06-02-2007, 10:20 AM
Honda built a thumper with reeds once. Weird huh?
procircuit406ex
06-02-2007, 10:56 AM
I posted this link last night but obviously noone cared to click on it...you might want to if you think a thumper dont have reeds.

http://www.exriders.com/vbb/showthread.php?s=&threadid=294025&highlight=trivia
REDRIDDER
06-02-2007, 11:25 AM
Originally posted by procircuit406ex
I posted this link last night but obviously noone cared to click on it...you might want to if you think thumpers do not have reeds.

http://www.exriders.com/vbb/showthread.php?s=&threadid=294025&highlight=trivia yeah 25 years ago and only in the xr500 lol...
Batavia's450r
06-04-2007, 10:17 AM
I think il just throw the piston in my bike and run it if not we'l throw something different on if it doesnt work out... i dont think wiseco would send us a product they wouldnt believe could help
300ex mxracer
06-04-2007, 07:40 PM
if i had a choice, id get a piston that is gas ported. all that it is, is when someone drills some small holes from the top of the piston into the ring land. some of the compressed gases go through the holes and push the rings outward, thus providing a better seal between ring and cylinder wall.