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Old 11-10-2010, 01:26 AM   #1 (permalink)
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Default 440 big bore?

Does anybody make a big bore for the ski doo 440??
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Old 11-10-2010, 05:44 PM   #2 (permalink)
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513cc kit for a 440 engine can be made by:

- DNE Performance
- Dmax.ca
- Engine Tech
- Anyone who knows how to bore cylinders to accept Mach 809 pistons

Crank shop makes a 740 bb making ~150 HP @8500 rpm's but its $3500!!

A cheap alternative if you can find used parts is to take 600 non H.O cylinders and 583 pistons 500 ss Y pipe and pipe. Takes 4 new bolts to mount it to the case and some other tuning.

Your best bet, if you want more out of the sled, is to find a donor sled with a 600 H.O or 800 motor and do a complete swap. Countless threads on this on dootalk. Common mod.
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Old 11-10-2010, 06:22 PM   #3 (permalink)
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if you decide to go the 600 route, I have cylinders with rave and a head if your're interested
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Old 11-11-2010, 12:16 PM   #4 (permalink)
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I would do a full 600 or 800 swap but i dont want the extra weight. Would i have any overheating problems with the 600/583 with the stock heat exchangers? What displacement would it be at with the 600 cylinders and 583 pistons? Thanks, bill804
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Old 11-15-2010, 01:42 PM   #5 (permalink)
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Wouldn't have overheating problems just by doing the topend. Displacement would be 597 same as the non ho.
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Old 11-15-2010, 09:29 PM   #6 (permalink)
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There are people that are running an 800 with just the short coolers (trail riding) and having NO overheating issues. IMO I'd add the long cooler though, just to be safe and what it's worth
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