blaster801

Hi Harry,
I have read with great attention your article abuot the BB kit for the Kawasaki SXR 800 that uses the OEM "stub" pipe.
My question is about the problem of engine vibrations associated to the big boring.
Unlike the Sea Doo big twins (880 and 951) that use a counterbalance shaft to cut vibrations the OEM Kawasaki engine is build without it
Attending that you use a very consistent boring (85mm) and conscious that in any case your kit is not a high rpm package I'm asking myself which could be the reliability problems associated to the lack of a balance shaft
Thank you
Michele

LisaLisa

I'm sure Harry will respond shortly, but in the meantime, I just wanted to let you know I've ridden the heck out of a ski with one of his big bore kits and not only does it really rock, but the ski has a couple of hard seasons on it and still rips like there's no tomorrow - with absolutely no problems whatsoever. If I had to do it all over again, I wouldn't have built my SXR to a Limited....I would have gone with Harry's Big Bore. It's pretty awesome.

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Group K

Michele,
We have done "alot" of 849s to date, and we have not encountered any level of vibration that is noticably worse than an 82mm (781cc) motor with the same mods. That said, the high rpm dry-pipe setups do have a wicked vibration at high rpms (7600-7800) ... but that is the case for both 781cc and 849cc SXRs.
We have done many stock piped 849cc Sleepers in-house, and they seem to run very smoothly at all speeds (they normally peak between 6900-7000 rpm).

Respectfully, Harry Klemm

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Unless otherwise stated, responses to all forum posts are based on my personal experiences working within the PWC industry, and developing high performance PWCs since 1987.

www.groupk.com