1000 pistons.......do I need to sleeve?

Found some aftermarket 1000cc pistons not 1015cc.......do I need to resleeve the 900 block? These are for a z1 or kz900.

just bore and hone.easy!

Yeah?!? NICE! I wasn't sure if that was too big for the 903cc block.........thanks!

you can go to 1045cc in 900 sleeves before re-sleeving.


leon holmes

Really?? 1045? I know 1015 block can go to 1105 and thats only 100cc more. Are the 900 sleeve that much thicker?

running 1015 pistons in stock 903 sleeves leaves very little sleeve .i always figured if you have to replace sleeves you might as well build an 1197 for about same money.

i have bored and honed sleeves out so thin i was afraid to let them roll over in the carpeted floorboard of my truck on my way to deliver them to the customer.you will be fine with the 1000cc pistons in your 900 sleeves.as plummen said thin yes,do-able definately.so now you get to figure out if you are comfortable with the sleeve thickness after bore and hone or not.i wouldn't hesitate,but then again i do my own machine work.

leon holmes
p.s. i copied and pasted this from wiseco's website.they are not clear on the 1045 as they don't say that you have to sleeve for those,but they offer a sleeve at the bottom.for the 1075 they clearly state re-sleeve for 900's.hth

Base gaskets and sleeves are supplied as noted
1015cc 2.756" or 70.00mm K1015 10.25:1 Cylinder boring only for KZ900 Drop in kit for KZ1000
Standard for KZ1000 $678.37 Piston: 4020M07000 $152.00 Rings: 2756XC Piston Pins: S523
4mm oversize for KZ900 Retainer Clips: CW17 CFM20 Head Gasket: W3917 $56.05
Stroke - 65.93mm Fiber Base Gasket: W5380 $14.32 Optional: Sleeve: KA627SL, 3099FA


1045cc 2.795" or 71.00mm K1045 10.25:1 Cylinder boring only
1mm oversize for KZ1000 $678.37 Piston: 4022M07100 $152.00 Rings: 2795XC Piston Pins: S523
5mm oversize for KZ900 Retainer Clips: CW17 CFM20 Head Gasket: W3917 $56.05
Stroke - 65.93mm Fiber Base Gasket: W5380 $14.32 Optional: Sleeve: KA627SL, 3099FA


1075cc 2.835" or 72.00mm K10741 9:1 Cylinder boring only Resleeving required for KZ900
2mm oversize for $638.53 Piston: 4379M07200 $142.04 Rings: 2835XC Piston Pins: S523
KZ1000 Retainer Clips: CW17 CFM20 Head Gasket: W3918 $56.05
Stroke - 65.93mm Fiber Base Gasket: W5380 $14.32 Optional: Sleeve: KA627SL, 3099FA

70 mm pistons in a 900 work very well

1045cc 2.795" or 71.00mm.... Cylinder boring only

In researching this very same issue in my project, pretty much everyone (known engine builders) I spoke to replied the same... 1045 in a 1000cc cylinder, bore & hone only...

In a 903cc cylinder, sleeves required but you will be on the thin side... In Arizona summer heat, thin not a good option...

Here's another thing to think about as in my case, I had broken cylinder fins so instead of paying over priced fin repairs, obtain one of the over stocked parts galore kit (cylinder, Wiseco pistons, rings, pins, clips included)... 1015, 1045, 1075...

Now this was an interesting option.... 1045, hmmm.... Here's the thing though, I would need to enlarge my top lower case cover for the bottom of the cylinder sleeves
to fit into, just like I would need to do with the 1075 cylinder...

At which point I figured, what was it worth to me like 1015cc with my CAM & carb selections wasn't enough.... Naw, didn't want to go there, especially after what I went through with MRE who does the machining for overstock... No thanks, 1015cc was more than enough power....

Just my 2 cents worth....

OMR

I have used 900 cylinders bored to 1015 many times with no problems. I know that this boring, process equals about a "one pound coffee can" full of metal shavings when completed. I live where it is about 110* or so in the summer time. I have never had a problem or nor has anyone that I know. This is a very good set up for most people. I also like the 900 bottom end with a 1015 cylinder bored first over. These set ups can run a .388" lift cam with no problems. Orient Express claims that they have a .400" cam that will bolt in. All you need is the stock pistons, boltin cams,HD valve springs, 29's and some clutch work and you will be on your way to some simple fun. Yes I am saying "stock kawasaki pistons" perform very well and last a long time. Every one of these engines that I have had, will lay down about 100' of rubber with a third gear hole shot. No brag just fact. I am building another right now out of the motor I got from eddiem. Even at my age I would run one of these agaist most 1075's on the road. I may sound bold but I've been there, done that and got a bumper sticker. I do not exspect most people to believe what I am saying, that makes it better for me. People never believe me when I say it's stock pistons, I am always willing to tear them down to prove it, for a fee.....Once again only my 2 cents.

yeah theres plenty of hard running small motors out there,it comes down to whether or not you know how to put it to the ground.

there's plenty of hard running small motors out there,it comes down to whether or not you know how to put it to the ground.

Quote from Larry C when doing my research into what performance I was looking for.... I guy in his area had a 1045cc motor, forget which cam & carb setup but said the guy was untouchable for many seasons...

Basically was kickin the crap out of everyone with that little motor setup... Big 1075's & huge CAM/carb guys just couldn't figure it out on how this little motor was cleaning their clocks.... :laugh: :laugh:

Outside of our wives/GF's, bigger is not always better!

OMR