Yeah, but that's what all the cool kids are doing. I don't like mullets or parachute pants. Chances are, if the bore is ok, I'll get a new set of rings and run it as is until it gives me problems then have something done to it. I don't know what that'll be yet. I do like the idea of the Nikasil plating even though the KK job is friggin expensive. I don't mind that as long as it's good. There's a few local guys who do it around here. I'll sniff around and see what I can find.

 

I would measure the ring end gap and check piston fit. If all is good like the ad says, you could just run it. Now you have a core if you decide to do something else.

Good find.

David

 

By the way, the 300cc piston must have the same weight as 250cc otherwise its gonna blowup the engine. I am wondering - making 350cc of the same weight would it reduce its strength and life?

 

I'm sure it's a little heavier. I wonder if it adds vibration? That's one nice thing about the 250 is it's smooth as a baby's ***.


Ok, what about compression ratios? What compression ratio do these different big bore kits have? I keep hearing people got the KK with the high compression and there's a guy out in NJ who can do a lower compression one for you if you like.

 

I dont think that it is good idea to run heavier piston. It wouldnt be slight vibration - few gramms at 50000 revs gonna be few kilos blowing up your engine....

 

The motor was a 300 at one time. Run the piston. I have the 351 and the piston IS heavier, but it still works fine. I have not blown it up at 10,500 rpm.

You could weigh the stock piston and weigh yours. Just run it! I suggest you DO NOT try to lighten the piston.

Think less, ride more.

David

 

Here's another one but it's a '99. I don't know what it can fit.

http://cgi.ebay.com/ebaymotors/Kawas...sQ5fLiterature

 

http://cgi.ebay.com/ebaymotors/ws/eB...m=300510652967

99 has the same part numbers as the 2000 and up according to the Motosport website. I was watching this one and hoping no one else saw it, was able to get it for just a few dollars more than the one you won.

With almost 13k on the bike I didn't want to invest the money for a BB kit. Now to wait for it to get here and see how it really looks and measures out.

Ken

 

I'm looking for one for my friend. It is a different part from the one I have. I can tell from the pics because there's cored-out recesses in the thick sections where the base gasket goes. Mine is a '03 or '04 and it doesn't have that.

 

I did see the small difference and believe they are minor and won't amount to much. It's not like they are water passages or anything like that. If there was that big of a difference between the 99 models and prior compared to the 2000 and newer I don't believe the parts would be listed as interchangeable.

Manufactures make changes in parts all the time for lots of reasons from cost savings, correction of problems, to changes in subcontractors. I don't believe or can find any information that the change was to correct a problem. It's not like when BMW changed the castings on the fork leg that was failing on the F650GS's, which BMW denies existed.

Ken