951 top-end rebuild question

[Tom XP]

I am getting ready to start a top-end rebuild on my 2000XP. There’s some minor scoring on the PTO cyl wall due to an oil pump failure. MAG piston and cyl is fine.

My question is, should I go one over on the pistons because of the scoring? Or just hone the cylinders? In other words, when a cylinder has scoring damage, it an automatic to go one size up.

Thanks for any advise - Tom

[Technical Support]

If you had an oil siezure your crank is also damaged, and yes you'll need to go one over.

[Tom XP]

What does SBT's top-end kit come with?

[Technical Support]

Pistons, clips, wrist pins, rings, head and base gaskets.

[2001rotax800]

No wrist-pin bearings?

[Technical Support]

They are optional, if you request them. They are normally replaced with a crank, not top-end, so they come with our crank.

[Bill O'Neal]

They should come with a top end kit because I would NEVER rebuild a top end without replacing the wrist pin bearings. I never understood why they are not included with a top end kit.
IMO, they should be included in every top end kit.
Ever see how much damage a wrist pin bearing can cause?

[Technical Support]

Sales asks if they are needed when taking an order and are included free. The bearings come in with the rods, not the pistons, so they aren't repackaged for the top-end kits, since many people purchasing the top-end kit also orer a crank.

[Bill O'Neal2]

Still does not stop all the calls I get for them when they forget to order the upper bearings from WSM, Wiseco and all the other top end kit suppliers.

[Tom XP]

Thanks. I will be ordering SBT's top-end kit (w/ WP bearings [img]smile.gif[/img] )

[Tom XP]

Does SBT's wrist pin bearings work with the OEM rods?

[Technical Support]

Yes.

[Tom XP]

Thanks. I was told today by your sales dept that the SBT wp bearings will not work with the oem rods. Different size or something. Just want to be sure before I order.

[Technical Support]

This thread is about a 951, and they fit. There are differences in the 800 and 720 though. We use a caged bearing in all our applications, replacing the needle bearings in Sea-Doo.

[Tom XP]

No one ever mentioned a 800 or 720. This is simply what I was told (twice by SBT sales). I will relay this when I order.

Thanks for your help - Tom