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KR1 Con Rods
Posted: Sun Feb 09, 2014 8:39 pm
by Joe439
I have only seen it mentioned can't find the answer what year KX 125 rods fit the crank? I was thinking same era 87 thru 91 ? sure I've seen the ones on pjme site never heard of the brand name they sale Long before rather use KX rods.
Re: KR1 Con Rods
Posted: Sun Feb 09, 2014 10:05 pm
by jarno
the kx 125 rods you can use are from 1978-1987 1992-1993.
Re: KR1 Con Rods
Posted: Sun Feb 09, 2014 10:58 pm
by 500bernie
The rods for the 88 model are still available from Kawasaki, but I think the later ones are NLA.
Re: KR1 Con Rods
Posted: Mon Feb 10, 2014 1:39 am
by Joe439
Okay so the '78 thru 87 and the 92/93 why skip over the 88 Thru 91's? I
Re: KR1 Con Rods
Posted: Mon Feb 10, 2014 7:33 am
by Luders
They wouldn't have skipped anything and I know nothing on the subject, but it seems likely they decided to try something different, found it didn't work as well, so reverted to what they were doing before.
That's my logic anyway.
Re: KR1 Con Rods
Posted: Mon Feb 10, 2014 8:35 am
by 500bernie
Luders wrote:They wouldn't have skipped anything and I know nothing on the subject, but it seems likely they decided to try something different, found it didn't work as well, so reverted to what they were doing before.
That's my logic anyway.
That sounds like Mr K
Re: KR1 Con Rods
Posted: Mon Feb 10, 2014 1:44 pm
by jarno
check fleybay original kawasaki rods still on there for sale
Re: KR1 Con Rods
Posted: Fri Feb 21, 2014 10:47 am
by James P
I used genuine KX125J1 (1992, Part No. 13032-1189) conrods on the last crankshaft I had built. I bought them from:
http://www.nosparts.se/ - still showing 21 in stock!
From memory, I think they were about US$50 each (rod only - no bearings or thrust washers). The dimensions are identical to the original KR-1 rod but at 158g they are slightly heavier (originals are 133g) - I'm hoping that the lighter pistons will provide some offset!
Regards,
James
Re: KR1 Con Rods
Posted: Fri Feb 21, 2014 11:04 am
by James P
Joe439 wrote:I have only seen it mentioned can't find the answer what year KX 125 rods fit the crank? I was thinking same era 87 thru 91 ? sure I've seen the ones on pjme site never heard of the brand name they sale Long before rather use KX rods.
"Long" brand conrods are usually sold under the Pro-X banner. I've used several Long brand Yamaha rods before (although not in a KR-1) and never had trouble. They are made in Japan and seem to be good quality. The big end bearings supplied with the Long Yamaha RD400 rod kits were a bit basic (nothing really wrong with them though) and higher-spec ones with a greater number of rollers are available from the Pro-X catalogue. The Kawasaki big end bearing is a different size to the Yamaha one, but you could research these Pro-X bearings (from notes I made ages ago):
22.222917 (14 rollers?)
22.222917F (16 rollers?)
Regards,
James