Is the cylinder block usable? It is bored +1 but..

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24 Mar 2016 09:27 #717107 by car5car
81 KZ1000J cylider block was bored 1mm over, but it is rusty and needs to get bored to next piston size. Can it be bored for +2mm pistons?
thanks. Are there +1.5mm pistons?

96 Yamaha Royal Star
82 Yamaha Virago 920

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24 Mar 2016 11:13 #717130 by zed1015

car5car wrote: 81 KZ1000J cylider block was bored 1mm over, but it is rusty and needs to get bored to next piston size. Can it be bored for +2mm pistons?
thanks. Are there +1.5mm pistons?

You will have to go 2mm O/S which is 1075cc.
These are readily available from Wiseco and MTC via Pitstop performance (Joe Hooper) or APE etc.
Kits come with correct gaskets, circlips and rings etc.
Make sure you get the correct kit with 17mm pins NOT 18mm.

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24 Mar 2016 14:54 #717160 by car5car
Thanks, Zed!
Just to make sure, so no sleeves necessary, right?

96 Yamaha Royal Star
82 Yamaha Virago 920

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24 Mar 2016 16:02 #717178 by zed1015
No sleeves. Just re-bore.

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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