1075 wisco advice needed

[zed1015]

Re. Rebore. - I just had a rebore to 1075 and a head skim for my latest zed , I always go to R & E ARNETTS at KELHAM STREET, DONCASTER Tel- 01302 323931, they have been in business since jesus was a nipper and are proper engine reconditioners and general machinists, If you are only going one size up ( one pass of the boring bar) it will only cost ?66 for the rebore which includes cork (plateau) honing. I've just had mine taken out from std 70mm to 72mm and it cost just ?90.

[Steve R]

Thanks for all the input.
Have rung Arnetts, zed, is yours back together yet and did you notice much difference in power?
Will I need a ring compressor?
Going to strip the engine down tomorrow, bits on order, so with a bit of luck back on the road in time for the sunshine.

[RALPHARAMA]

Steve R

Yes you will need a ring compressor, but no you don't need to dip your hand in your pocket.

1) You butcher an old biscuit tin with the tin snips to make two strips just under an inch wide and just short or the circumference of pistons (approx 9")

2) Wrap the strips around the rings on the two inner pistons (2 & 3)and secure with cable ties. Ensure that 2 & 3 are at TDC and that you have plenty of oil around the surface of the bores.

3) Easier if you get a second pair of hands to lower the bores onto the pistons slowly and evenly whilst you ensure that you hold the pistons parallel with the barrels. As the pistons slide into the bores the tin strips will be forced down the piston and when you are sure all the rings are safely in the bore, you can snip off the cable ties and repeat the op on the outer two pistons.

Doubtless the proper Kawasaki service tool that does all four together would be easier, but not having one I'd sooner keep the brass in my pocket.

Wiseco rings are not two a penny so if I were you I would ignore the protests of "You can just poke 'em in with a screwdriver". In my youth I have fitted lots of pistons without a compressor and through sheer luck never broke one, but I know plenty that did!
Older and wiser I can't see the point in taking the risk :

Can be a fiddly operation, so just relax and take your time

[rafstopcarryon]

steve you have a p/m

[zed1015]

Hi. I don't use a ring compressor ( never have ), I do it by hand ,working across from 1 to 4 cylinder with the cylinder block at a very slight angle, It is easy to do but then i have been doing it for quite a few years. As for performance it all depends on what else you have in your motor. I have never just put a big bore kit on a std motor so i really couldn't comment , although my Wakisaki Z1R runs a 10.25 to 1 / 1075 wiseco kit with a proper race flowed head / 1mm o's stainless valves /std cams and 32mm 1000 katana carbs and 37 inch downpipes with a fruity can and i have seen a genuine 160mph ( to the disbelief of my pocket rocket owning mates) and still going with me flapping behind uncontrollably in the wind.