So I bought a UBR 900 top end. I need to get pistons, do I have any other options other then fastrax? Same with head orings, they want $125 for o-rings, anyone know the size of head orings needed? I'm sure I could find some viton orings somewhere for cheaper. Do they take a special base gasket or oem?
UBR 900 - pistons - orings
- Thread starter Twostroke
- Start date
I measured the o-rings a few years ago and found an exact fit viton o-ring in the Grainger catalog, I can't recall the size though. You can cut your own base gasket from proper thickness material, they are different than stock. You may be able to modify a stock gasket with an exacto knife, sorry I don't have better info. it'a been a while.
Hopefully someone will remember what size o-rings these take. I'm having a hard time stomaching the $125 for 4 orings and two base gaskets. Pistons are $210 each.
I'm trying to keep the rebuild around $300-400 idealy, nearly $600 for two pistons, and gaskets seems steep. Is this what I have to pay to play in the mod world?
This is a std 800 ves based UBR 900 kit.
I'm trying to keep the rebuild around $300-400 idealy, nearly $600 for two pistons, and gaskets seems steep. Is this what I have to pay to play in the mod world?
This is a std 800 ves based UBR 900 kit.
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oscar680
Well-known member
I used to own a Polaris based UBR 900, from my experience, it wasent a motor that liked to be messed with or cheaped out on. little things like the thickness of the cyl base gsk can make a pretty big difference in performance, depending on how it was set up. best bet is to get the history on the motor and talk to Curt at fastrax.
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paulharris
Well-known member
you should consider yourself lucky that they even have the pisons and gaskets in stock....Union bay has been closed and stopped making those kits many years ago. I remember paying a lot for pistons for one of my UBR big bores. If you try to save a buck here it will likely come back to bite you later
Fastrax has been carrying on the torch for UBR and I think they will continue to do so, well at least I hope so..
I was just inquiring because for all I know the pistons used in these kits could have been a OEM piston from another model or make of machine. I had a bigger bore one off UBR motor before and it used sea doo pistons...
I'm still riding UBR's 850 kit on an 800 case. I used the stock base gaskets and just cut them. The pistons for my kit were alson from a sea-doo. The piston pins had to be relocated so I had to get them from Fastrax, as well as special wrist pin bearings. I was able to find the o-rings at a local auto parts store by measuring them. Have had good luck.
My truck needs a new transfercase so I'll selling the kit.
