teamdewalt
New member
Anybody got a recomendation on pistons for
a 1981 exciter 440, and 1979 srx 440??? Wanted
to know if wiesco was the way to go????
Thanks,Shawn
a 1981 exciter 440, and 1979 srx 440??? Wanted
to know if wiesco was the way to go????
Thanks,Shawn
YAMMIEGOD3:16
Active member
TRY, AND I MEAN TRY TO RUN YAMAHA ONLY. 3:16 (yammie tony)
i agree with yammiegod ,stick with yamaha pistons only.
hman
Member
Can you still get stock 78-80 srx pistons? hman.
YAMMIEGOD3:16
Active member
MIGHT BE TUFF NOW IF YOU TRY AND ORDER THEM, BUT ALOT OF OLD DEALERS I BET STILL MIGHT HAVE THEM. FOR SOME REASON, I NEVER WAS COMFORTABLE WITH WIESCO IN THESE SLEDS. 3:16 (yammie tony)
Not Helping
You guy's are not making me feel real good here. I just put .50 over Wiseco's in my 78.
You guy's are not making me feel real good here. I just put .50 over Wiseco's in my 78.
YAMMIEGOD3:16
Active member
GP396, NO YOUR FINE BECAUSE WIESCO ONLY PLACE TO FINE OVERSIZE. SO YOU HAVE NO CHOICE. BUT IF ITS STANDARD, YAMAHA ALL THE WAY. 3:16 (yammie tony)
Xtremepowersports lists oversize, but always on backorder.
http://www.yamahaaccy.com/parts.aspx
Local dealers only had 1 .50 piston and no rings. With some hunting I probably could have come up with OEM.
I was able to find locally OEM weights and every other bushing, pin, roller, etc., needed to rebuild the stock clutch. Not to hijack, but is there any benefits of changing the rivet positons in those weights. On the toasted ones there in the outer two holes, nothing in the inner most. Just looking for a little more than the stock 3300rpm engagement. Was thinking of sanding the ridge (created by being washed out on both sides near the middle) out of the originals and seeing how they worked.
Yammigod, I know you're looking for a 78 SRX. My vintage bud bought one in boxes last fall for $250. Surprisingly it was all there and the fresh engine just went back in. He just located one o-ring he needed for the power jet on one of the carbs. Hopefully the snow comes Thu and we can be testing both sleds Sat.
http://www.yamahaaccy.com/parts.aspx
Local dealers only had 1 .50 piston and no rings. With some hunting I probably could have come up with OEM.
I was able to find locally OEM weights and every other bushing, pin, roller, etc., needed to rebuild the stock clutch. Not to hijack, but is there any benefits of changing the rivet positons in those weights. On the toasted ones there in the outer two holes, nothing in the inner most. Just looking for a little more than the stock 3300rpm engagement. Was thinking of sanding the ridge (created by being washed out on both sides near the middle) out of the originals and seeing how they worked.
Yammigod, I know you're looking for a 78 SRX. My vintage bud bought one in boxes last fall for $250. Surprisingly it was all there and the fresh engine just went back in. He just located one o-ring he needed for the power jet on one of the carbs. Hopefully the snow comes Thu and we can be testing both sleds Sat.
YAMMIEGOD3:16 said:
The way my engine builder friend explained it to me, is that forged pistons (Wiseco) expand slightly more than cast piston (OEM). Therefore if you use forged piston they have to be clearanced more than cast pistons. But they are clearanced on the piston not the bore. He says you have to sand the piston ABOVE the wrist pin to 14 thousands clearance and leave the skirt alone.
He has been doing this for 30 years and seems to know what he is talking about.
Can anyone confirm this? or has anyone tried this themselves?
YAMMIEGOD3:16
Active member
I WOULD SAY YOUR ENGINE BUILDER IE RIGHT. 3:16 (yammie tony)