Z1OwnersClub GB

I am having to bore my Z1000J to the first oversize. Our ocal New Zealand Kawa dealers are unable to source 0.5MM (first oversize) pistons or rings locally or from Japan. I have managed to track some down over your way but they are soooh expensive, running out about 80 pds for a piston plus ring set.

I have noticed Wiseco offer a big bore kit for about two thirds the price and "for free" I get all the extras that I need such as circlips gaskets and wrist pins but my concern is how much meat I have to remove to fit them. The first OEM over size has a piston diameter of about 70MM but the smallest Wiseco is 72MM. Boring to this size leaves only about 1.75MM wall thickness in the liner which seems to be very thin.

Has anyone had any adverse experiences fitting these kits and would they recommended them as against paying the premium for OEM hardware and only boring out by 0.5MM?

I have been told that the minimum wall thickness has to be 2MM but this may be an urban myth?

Wiseco kits are much more cost effective option when re-boring a ZED motor compared to using KGP (Kawasaki genuine parts).
I've got a Z1000J cylinder block that has been bored to 73mm(1105cc)running a Wiseco kit and i think this is with the standard Kawasaki liners but i'm not 100% sure.Wiseco may have made a 71mm kit for the 1000J back in the 80's but some of the piston kits are now un-available due to lack of demand.
If you speak to GREMLIN aka Steve Wells at Gremlin Racetech he should be able to tell you what Wiseco kits are available for 1000J.His contact details are as follows:
www.gremlinracing.co.uk
TEL:07950 876368
If you go to his website you can email him via the link,if you have any probs let me know and i'll contact him for you.
Gremlin supplies Wiseco kits at the best prices available in the U.K. so he will be able to do you and anyone else a good deal.
Wiseco did a 70mm kit for the 1000J but it was race kit with a 12:1 compression ratio.

Hi Kiwiz,
I've had a Z1A with 1015 & my current Z1000A2 with 1075 Wiseco. They are forged pistons (ie: tougher than original) and great bits of kit. I would rather spend me dosh on a Wiseco than a standard setup!

Guys, many thanks for your comments!