92 crank vs 93 crank? - ZX Forums
 
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post #1 of 6 (permalink) Old 11-03-2013, 07:06 AM Thread Starter
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92 crank vs 93 crank?

So a friend of mine is trying to build a stroker motor for his ZX7. He says he needs a 93-95 crank but I only have an extra 92 motor. The lobes and everything are the right size but we're wondering if the 92 is as strong as the 93-95?

Any input?
Thanks!

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post #2 of 6 (permalink) Old 11-03-2013, 07:50 AM
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Originally Posted by Baggey22 View Post
So a friend of mine is trying to build a stroker motor for his ZX7. He says he needs a 93-95 crank but I only have an extra 92 motor. The lobes and everything are the right size but we're wondering if the 92 is as strong as the 93-95?

Any input?
Thanks!
The ZX9R' s (94-97) used common crankcases with the ZX7's so when they came out the cases were redesigned for strength and there is a visual difference. I have never heard of any difference between the 91-95 ZX7 cranks. Or any strength (or weakness) issues with the cranks.

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post #3 of 6 (permalink) Old 11-03-2013, 08:49 AM Thread Starter
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I asked at the local Kawi dealer and he said the part numbers between 92 and 93 are different but that's all he knows.

2008 ZZR600 - street
1995 ZX6r - track
2006 KLX250s - woods
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post #4 of 6 (permalink) Old 11-03-2013, 09:57 AM
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I'm pretty positive it's been done with a 91-92 crank with no issues.

Spending too much time to make a bike faster than it really needs to be.

https://www.zxforums.com/forums/zx-7r...thread-23.html
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post #5 of 6 (permalink) Old 11-03-2013, 10:06 AM
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I have a 93-95 crank that was intended for that kind of build for a 96+, and I am NOT going to use it, if you want it...let me know.

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post #6 of 6 (permalink) Old 11-03-2013, 10:43 AM
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As 2fat said, it was 94 when things changed. The superbike teams told Kawasaki that the cases were failing above 135hp and there were a few series where bigger displacement could be used. They made the cases from a common casting in 94.

I have not heard of crank failures often in the ZX7 for much of any year. More of an issue was pulling and cases causing bottom end problems.

I am not sure what the difference would have been in 93 causing a new part number, but if anything it would have been in 94 if it was a strength issue. I personally would run any 91-95 crank for this mod.
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