z1a poor compression, time for a rebore

[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

[chrisu]

I have NEVER had anything but great delivery service from Z1 Enterprises so I wouldn't let that part put you off.

[steve r1]

not z1 enterprises that worries me,it"s the postal, customs system,heard a few horror stories about slow delivery,

[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.

[GEZ635]

Have you actually measured your bores yet? Badly seated valves will also affect compression!

[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.

[chrisu]

Probably best to get the head done while it's apart