zxr400 l piston differences

jackdim · Post by **jackdim** » Thu Jul 16, 2009 5:59 pm

Noticed a difference in the piston's I took out of my bike and the pistons that I bought from Kawasaki when I got them home, are they interchangable and what's the purpose of having two different types?

Old Pistons (marked 707 with a flat top):

New Pistons (marked 657 with a ridged top):

Comparison:

RedexRobB · Post by **RedexRobB** » Thu Jul 16, 2009 6:20 pm

No idea, but thats pretty damn interesting that they are different!!

Post by **masterofinsanity** » Thu Jul 16, 2009 8:09 pm

did you order the correct year piston?

jackdim · Post by **jackdim** » Thu Jul 16, 2009 8:59 pm

Yup, ordered them for the L3 which is the year of my chassis but not sure if the motor is from a different model zxr400?

RedexRobB · Post by **RedexRobB** » Thu Jul 16, 2009 9:08 pm

Wouldnt count that out.. May have been better to supply an engine number.

jackdim · Post by **jackdim** » Thu Jul 16, 2009 9:12 pm

RedexRobB wrote:Wouldnt count that out.. May have been better to supply an engine number.

Agreed, will chat to the suppliers tomorrow and see what they say.

jackdim · Post by **jackdim** » Fri Jul 17, 2009 3:23 pm

So then! I found both pistons are for an L3 but one is for a UK L3 and the other is for a Japanese L3, two different part no's. I didn't have time to check but my friend at the dealershop is going to check that the UK and Japanese L3's: Cylinders, Cylinder Head, Cams, Valves, Conrods, Crank etc are the same by comparing part no's and if so they're interchangable and I'll use them.

Post by **zimm** » Fri Jul 17, 2009 3:58 pm

looks like the UK spec ones would give a higher compression ratio ..

jackdim · Post by **jackdim** » Fri Jul 17, 2009 4:07 pm

Perhaps the 707's which came out the bike are designed for slightly lower comp for lower power to be line with Jap restrictions of bikes at the time?

Post by **zimm** » Fri Jul 17, 2009 4:14 pm

maybe ... they look the same as the ones in my H engines ... I'll check the part numbers later.

jackdim · Post by **jackdim** » Fri Jul 17, 2009 4:17 pm

spot on, thanks.

Unless I'm absolutely certain that there is no difference between the Jap and UK L3 motors (other than pistons) I think I'll most likley stick to the ones that came out of the bike, any difference in power between the two is probably so marginal I'd probably hardly notice it on the road.

tk400 · Post by **tk400** » Sun Jul 19, 2009 4:40 pm

If you don't use them. how much do you want for them..cheers.

Regrds TK400

jackdim · Post by **jackdim** » Sun Jul 19, 2009 5:26 pm

Not for sale, exchanged the 657s for 707s free of charge.

Post by **zimm** » Sun Jul 19, 2009 6:34 pm

sorry for the delay

checked my box of pistons ..

all are marked 657.. all came out of H model engines

I have heard about some import L's circa L3/L4 that had lower compression and milder cam profiles.. looks like yours is one

tbh, if you can.. i'd swap them back and fit the 657's to gain a touch of compression.

might be worth checking out any differences with your cam's aswell.

jackdim · Post by **jackdim** » Sun Jul 19, 2009 11:56 pm

I'll see if I can get the 657s back, they've got to be interchangable with the 707s eh?

I need to strip the motor out of my UK L1, might use the cams out of that for my L3....

www.zxrworld.co.uk

zxr400 l piston differences

zxr400 l piston differences

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