To Ring or Not To Ring

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Dear Motorhead,

I would like to know what you think about ringing a 2006 Ski-Doo 600 SDI.

The machine has 5200 miles on it, but runs great. I’ve been told they can get 7500 or better.

What do you think?

Thanks Bob


Thanks for your email!

Great question. Here’s how I would proceed. First, do a compression test on the engine. If you are within the recommended range for both cylinders (less than a five percent variance between the two cylinders as long as both are within OE recommended tolerance) and are satisfied with the engine’s performance I would be reluctant to tear the mill down and re-ring.

However, I can understand with the miles you obviously ride – you don’t want to be faced with a tear-down mid-season and miss some good riding.

Here’s my take. These engines are less likely to need rings than they are a crank. I would check the bottom end of the motor carefully by examining the PTO and mag end seals.

If there’s any weeping there, take it apart and re-bearing the crank. This would be the best place to apply your efforts.

A well maintained engine with the kind of klicks you’ve got is not likley to all-of-a-sudden break a ring or wear out at a rate any more quickly than it has thus far.

A catastrophic failure – like a bearing issue – has the potential to mess up your day in a way far greater than the rings.

While not a profound problem, we have had feedback from readers on high mileage SDI 600’s with a hunger for crank bearings.

Hope this helps.

Motorhead Mark

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