9 replies to this topic

[moresnow4skidoo]

Hi guys, I'm looking to rebuild the motor on my 04 500SS. Im handy but not a gearhead and I have a buddy who works on 2 stroke dirt bikes that is willing to help me out. He is also a machinist. The motor still runs great but has about 9,000 miles on it and has some other small issues that requires taking alot of stuff apart to fix so I might as well rebuild. The sled is also bone stock. When we rebuild it, I'd like to put in larger pistons (if possible), racing camshaft, valves etc. I'm planning on going through the entire sled replacing worn out parts and upgrading things where it makes sense. If you guys have any recommendations to do this up right I'd really appreciate it. I'd rather do this instead of getting a different sled seeing as I don't get out that much. I've got two young kids that keep me pretty busy. Thank you in advance.

[mxzwild]

I suggest you study up on two strokes. No valves or camshafts. 9000 miles probably good idea to replace bearings on crankshaft or get a rebuilt one. They do make big bore kits for the 500ss. Up to 660cc I believe. You need to decide your goals and budget. I just did a top end rebuild on mine for a little over $200.

[moresnow4skidoo]

Mxzwild, good to know. The crankshaft functions very similar to a camshaft correct? And I believe there are reed valves correct?

[AKRideNMine]

The crankshaft is not like the camshaft. The rod arms that hold the pistons connect to the crankshaft which turns the primary clutch. If you are upgrading, you can do a big bore, upgrade clutches, and aftermarket reed valves

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[moresnow4skidoo]

AKridenmine thanks for the input. Makes sense. Camshaft lifts the valves in a 4 stroke motor. I found a bore kit that I can share a link to. Is there such a thing as a racing crankshaft? Besides superior materials, can they be any better than a stock crankshaft?

[moresnow4skidoo]

Ski Doo: SKI-DOO 500SS and TNT Engine
https://www.2strokeh...e-kit-500ss-tnt

Here is the kit I found.

[smurfy71]

Waste of money in my opinion.  The 500ss is a strong pulling sled to begin with.  Do the top end, bore the cylinders and go up a size or 2 in piston and enjoy the sled.  Upgrade the clutch if needed, change the gearing.

[Mach189]

Talk to Big John @ Sled Head Racing in MN

[AKRideNMine]

AKridenmine thanks for the input. Makes sense. Camshaft lifts the valves in a 4 stroke motor. I found a bore kit that I can share a link to. Is there such a thing as a racing crankshaft? Besides superior materials, can they be any better than a stock crankshaft?

I wouldn't pay for a racing crank, just big bore it and get a clutch kit.

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[Mach189]

Ive read that they respond really well to porting, like a trail port.