top end ?
- Thread starter nh603
- Start date
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blk9038
Well-known member
according to Big John (skidoo guru) wisco pistons have a lot of differances in size and recomends mcb pistons and i ran this by my mechanic that has been doing snowmobiles for 20 years as when my wisco piston caught a ring last year i was looking at same issue you might be just pull up last years threads on pistons and see what i am talking about , i have a 800 rev 2004 now with the mcb pistons in it. i usually do all my own mechanical work however i really wanted some expert at this as i didn't have tools and such for doing seals (just because) so i did the install and now have about 10 to 12 hrs on it and had to use back up sled for 1/4 of the season while i was getting engine done so i also recomend real good oil (redline or amsoil another issue) as power valve gumming/piston gumming and such lots of great reading on subject here. also go to page number #2 and see WHAT PISTONS FOR 05 800 DUAL OR SINGLE and see all reply's including mine hope this helps.
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Wisecos are good but hardly anyone sets up the cylinder for them. You need to set the correct piston to wall (P2W) for them. They are not a drop in like the stock or other cast pistons that are more forgiving when it comes to expansion.
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nh603
New member
how do you go about doing that? just get the cylinder honed?
honing may do it. Or you may need to bore it and then have it nikasiled.
I replaced many pistons in my 04 rev and always used OEM...no issues.
If its a stock (ish) motor, hard to beat just plugging a set of OEM slugs in it and being done.
For our wild motors I use nothing but Wiseco...when the engine is prepared for them (clearance, profiling, etc) they are just the toughest option available. A cast OEM or cast OEM type piston can not deal with any deto at all...and from time to time a full mod might see a bit of deto so I like the safety of forged pistons.
For our wild motors I use nothing but Wiseco...when the engine is prepared for them (clearance, profiling, etc) they are just the toughest option available. A cast OEM or cast OEM type piston can not deal with any deto at all...and from time to time a full mod might see a bit of deto so I like the safety of forged pistons.
OEM all the way!!!!
