black magic 925
- Thread starter feetsbig
- Start date
There should be a number etched into the piston. If you have this I can see what I have or try to help. Otherwise a size (in mm) of the piston would help.
K
Here are a set for a Speedwerx 925 if they will work?
http://www.ebay.com/itm/Hot-Seat-Pe...12273&pt=Snowmobile_Parts_Accessories&vxp=mtr
http://www.ebay.com/itm/Hot-Seat-Pe...12273&pt=Snowmobile_Parts_Accessories&vxp=mtr
91.5 mm diameter pistons works out to about 999 cc by my math. ( pi x radius squared x stroke x 2 ) Your 925 should take an 88 mm piston if I figured it right.
The 90.3 mm M1000 piston I use makes 973 cc.
Hope this helps.
The 90.3 mm M1000 piston I use makes 973 cc.
Hope this helps.
K
Now that you say that your right. The 91.5mm pistons are for the Speedwerx 1000 kit so that ad is wrong... sorry about that
I would wish someone would come out with a 88mm piston for these older cats? It would be a low budget cc increase that I feel would work just great! Then once you wear that bore out you have an option to go to the cat pistons for the 975 set-up. Really how thin of a bore can you run "safely" in one of these engines? I bet you can get into distortion and cracking with the 91.5 bore? Mike
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