What piston do I have??? help!
What piston do I have??? help!
So I am about to do a top end on my 01, but I am not sure what piston to order. The bike currently has a wiseco. I took the piston down to my local shop to have them measure it (same shop that's doing the honing) and it measured out to 90.25. Wiseco doesn't make a 90.25, as far as I know. What do I have? Does a 90.5 piston actually measure 90.5, or is it smaller to account for thermal expansion? If that is the case, what would I order if i want a cast piston?
Thanks in advance for any help.
Thanks in advance for any help.
Probably a pro-x or some other cast piston.. wiseco's usually go in .5 increments so 90 then 90.5 then yer screwed for wiseco. You can get forged pistons up to 91 so you have a bit of room before a resleave. Also most pistons stamp/cast their model number and name and whatnot inside the piston under the dome.
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- Roostius_Maximus
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wiseco, vertex, prox and rocky cycle all made pistons that size
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- iggys-amsoil
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So Wiseco at one point did make a 90.25? I was questioning my shop's measurement, because I didn't see a 90.25 in Wiseco's lineup. The piston in it now, the 90.25, is definitely a Wiseco unless someone else made forged pistons at some point or my shop made a bad measurement. I will probably go ahead and confirm this with Wiseco anyway.
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k, they did, lets get this simplified
IF theres a # on the dome, post it, a 636 or 554 is a wiseco, if the number is 4 digits like 89.92 or something and has an arrow it probably a VERTEX, IF it has the name ART cast under it its probably stock or a rockey cycle, IF it says prox, its proX, If the piston has any machined look to the sides of it its a wiseco, measure the'rainbow shaped cuts width and post it either in mm or inches, if the ring is flat and not angled its a wiseco,
if you stil have trouble figuring out whats what, its you
IF theres a # on the dome, post it, a 636 or 554 is a wiseco, if the number is 4 digits like 89.92 or something and has an arrow it probably a VERTEX, IF it has the name ART cast under it its probably stock or a rockey cycle, IF it says prox, its proX, If the piston has any machined look to the sides of it its a wiseco, measure the'rainbow shaped cuts width and post it either in mm or inches, if the ring is flat and not angled its a wiseco,
if you stil have trouble figuring out whats what, its you
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- iggys-amsoil
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The last time I looked you could get a Wisco in 89.25 and 89.75. The 89.75 is whats in my bike now. Its when you get to 90.00 that it jumps to 90.50 then 91.00. So there is no 90.25 or 90.75 unless perhaps one goes back several years. At that point its a moot issue and turns into to trivea question.
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62 pilot, EGH needle, 172 main
03 Gen III CR250 frame
2013 Dodger Charger 5.7 Hemi
http://www.prisonplanet.com
Your Amsoil Customer # 350882
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sounds like a vertex, no name cast underneath it?
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Vertex says " Vertex" right on it....
The current Vertex in my bike is 5 years old....
http://cr500riders.com/cgi/yabb/YaBB.pl?num=1108665459
I'm putting a new one in next week.... I'll post up what a severly flogged, pinged, over-revved, and otherwise tourtured Vertex looks like.
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ok, ya, i'm an idiot, i meant to say pro-x. Had jr helping me
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