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z1a poor compression, time for a rebore

Posted: Sat Apr 07, 2012 11:11 am
Author: steve r1
hi guys,trying to find nos pistons & rings for my z1a, z1 enterprises have them not overly keen on buying from us,import taxes vat,and iffy delivery service is a worry anywhere else i can try?What"s opinion on repros from zpower,cheers

Posted: Sat Apr 07, 2012 12:04 pm
Author: chrisu
I have NEVER had anything but great delivery service from Z1 Enterprises so I wouldn't let that part put you off.

Posted: Sat Apr 07, 2012 3:34 pm
Author: steve r1
not z1 enterprises that worries me,it"s the postal, customs system,heard a few horror stories about slow delivery,

Posted: Sat Apr 07, 2012 4:49 pm
Author: rogz1a
I guess from your title you want oversize pistons/rings. If not I have a complete set of standard rings that have only done 100 miles. I found that my bores were at maximum tollerance so needed a rebore. There's some used pistons which I was told by S.E.P were close to minimum tollerance so I replaced these as well. Any good to you ?
I got new pistons and rings from z1 enterprises. They arrived within 7 days and no problems with customs etc. :wink:

Posted: Sun Apr 08, 2012 10:37 am
Author: GEZ635
Have you actually measured your bores yet? Badly seated valves will also affect compression!

Posted: Sun Apr 08, 2012 3:51 pm
Author: steve r1
yes bores checked by zlbman,they were out of tolerance,also confirmed by leakdown test,valves checked too,they were ok.bike has done 43000 on original standard size pistons.Been f---n about for last 6months thinking erratic tickover was carb problem.even with low compression on 2&3 bike seemed okayish at speed,can"t wait to see difference after rebore.

Posted: Sun Apr 08, 2012 5:25 pm
Author: chrisu
Probably best to get the head done while it's apart