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View Full Version : yz Piston in a 250R ??


spliffy
09-03-2003, 06:33 AM
Anybody ever heard of putting a YZ piston in a 250R?? If you have, any idea what the benefits of this might be? weight? strength? :confused2 :scary:
nakomis0
09-03-2003, 06:36 AM
:huh
spliffy
09-03-2003, 06:48 AM
Heres one better yet for you Nokomis... I just bought a MX Ported LRD cylinder thats currently running a YZ piston..... Thats where this question is coming from heh :confused2 :confused2 I will be putting a 250r piston back into it, I just wanted the ported cylinder... but I am wondering why a YZ piston?
MIKE400EX
09-03-2003, 08:28 AM
Probably for better port timing for the intended application.
nacs400ex
09-03-2003, 09:08 AM
I have heard of people putting phazer sled pistons in their 310 R's. There has got to be a reason... maybe its just cheaper?
TGW_400ex
09-03-2003, 09:16 AM
why could u put a yamaha piston in a honda:huh
Chanman420q
09-03-2003, 09:18 AM
ive heard this before, there was a thread on it too... lemme see if i can find it


http://www.exriders.com/vbb/showthread.php?s=&threadid=54524&highlight=YZ250+Piston+250R

;)
Juggalo
09-03-2003, 09:55 AM
i know it was a hot setup people did on their suzuki LT's back in the day.
spliffy
09-03-2003, 10:13 AM
Thanks
spliffy
09-03-2003, 10:49 AM
Ok I found out a little more on this setup.... you have to have the long rod to run a yz piston cuz of the stroke you need, but its supposed to have wicked fast revving much like the 86's have with the shorter rods. You can also use a 250r 69mm piston which wiseco makes & it is the same size as the yz piston & you can bore it one more time & they make a 69.5 says mac dizzy but I didn't find it.... so I will be putting the 69mm wiseco in it & see how she scoots cuz I have a short rod & don't plan on changing it.
spliffy
09-03-2003, 10:58 AM
Wiseco does make a 69.5mm I just found it :scary:
F-16Guy
09-03-2003, 11:21 AM
Originally posted by MIKE400EX
Probably for better port timing for the intended application.
I agree, it probably changes the port timing a little.
09-03-2003, 11:34 AM
my freinds did it on theres when they went to 10 over
holeshot19
09-03-2003, 11:50 AM
people usually do it because a 87-89 cly can only be bored out to 68mm.u can use a 86-89 yz piston thats 68.50 with a 2mm spacer plate. now a 85-86 r cly can be bored out to .140 thousands over.the engine i put one in had lots of midrange up power and has a wicked hit.