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Old 06-02-2014, 12:45 AM   #1
MikeGayner OP
Joined: Jan 2014
Oddometer: 30
Kawasaki A1/A7 - piston and rod options

Is anyone here experienced with these Kawasaki twins? I'm rebuilding the engine on my A7 and need help with piston and rod options. Connecting rods are virtually impossible to find for these bikes, so a lot of people seem to be going with JS440 jetski rods (or NOS H1 rods), which are 5mm taller than the stockers. Some people have worked around this with a spacer under the cylinder and longer studs.

Has anyone tried fitting F3 Bushwhacker pistons in this bike? From what I can gather they're virtually the same dimensions as the A7 pistons except 3mm too short. Combining these pistons with the jetski rods seems like you could get away with using two base gaskets and maintain very nearly the original crank case volume. Has anyone done this?

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Old 06-03-2014, 08:11 PM   #2
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Racer111v's Avatar
Joined: Aug 2011
Location: Hudson, NH
Oddometer: 817
This place may be able to help with rods. They will manufacture rods for a reasonable price. They got back to me right away when I emailed them. They didn't have spec.s on file, but if I supplied the needed dimensions they could make them for me. I was able to find what I needed, so I never had them make any for me.


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Old 06-03-2014, 08:35 PM   #3
MikeGayner OP
Joined: Jan 2014
Oddometer: 30
Cheers Race I'll take some measurements and give them an email.

I've since found that KX125 rods will fit with a narrowing at the big end, but requires custom crank pins and possibly piston pins too?? It's about 0.1mm too long, which is fine I think.
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