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Old November 17th, 2018, 07:18 AM   #3
Z1R rider
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Name: Roger
Location: Mitchell, South Dakota
Join Date: Apr 2014

Motorcycle(s): 1978 Z1R, 1999 EX250

Posts: A lot.
MOTY - 2018, MOTM - Oct '16
Quote:
Originally Posted by InvisiBill View Post
For whatever it's worth, Racetech's calculator breaks them down into '01-'03, '04-'05, and '06-'09. They're listed as having 450#, 425#, and 525# spring rates respectively. For comparison, the PreGen is 440# and the NewGen is 520#.

Just browsing some eBay pics, it looks like the '06-'07 ones have the reservoir sticking pretty much straight out, like the '08-'09 ones, as pictured in the first post. The '04-'05 and '01-'03 ones both have it angling up quite a bit.
this info came out of this post, https://www.ninjette.org/forums/showthread.php?t=214238, there may be other info in the post that will help you. Nice bike by the way!!
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