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04 500SS rebuild/upgrade


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#1 moresnow4skidoo

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Posted 20 February 2021 - 08:53 PM

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.

#2 mxzwild

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Posted 20 February 2021 - 09:07 PM

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.

#3 moresnow4skidoo

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Posted 20 February 2021 - 10:55 PM

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

#4 AKRideNMine

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Posted 20 February 2021 - 11:08 PM

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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#5 moresnow4skidoo

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Posted 21 February 2021 - 12:28 PM

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?

#6 moresnow4skidoo

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Posted 21 February 2021 - 12:32 PM

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

Here is the kit I found.

#7 smurfy71

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Posted 23 February 2021 - 11:43 AM

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.


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2016 1200 Renegade X

2005 MXZ 500ss

2004 600HO SDI (For Sale)
94 MX 470

 


#8 Mach189

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Posted 23 February 2021 - 03:42 PM

Talk to Big John @ Sled Head Racing in MN

#9 AKRideNMine

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Posted 23 February 2021 - 04:00 PM

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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#10 Mach189

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Posted 24 February 2021 - 11:02 AM

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






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