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APE or rebuild original?!?
- kztee
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- TeeRoy
1977 KZ 1000A - Currently rebuilding
1980 KZ 750 LTD - Mostly stock daily rider
1979 KZ 1000 LTD - Parts bike and/or future project
1979 KZ 1000 ST
1980 GS 750 L
2003 ZRX 1200 R
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- Duck
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- e vica na i sau na ga
Get it apart and see what you have to work with. If liners are too worn, you'll need oversize rings and pistons so you may as well go for more displacement. If still in spec, rings are cheap and you can keep eye out for a 2nd engine to build while you ride.
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- kztee
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- TeeRoy
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1977 KZ 1000A - Currently rebuilding
1980 KZ 750 LTD - Mostly stock daily rider
1979 KZ 1000 LTD - Parts bike and/or future project
1979 KZ 1000 ST
1980 GS 750 L
2003 ZRX 1200 R
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- 1045
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1045
1045
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- Duck
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- e vica na i sau na ga
-Duck
Post edited by: Duck, at: 2007/01/27 22:55
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- kztee
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- TeeRoy
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1977 KZ 1000A - Currently rebuilding
1980 KZ 750 LTD - Mostly stock daily rider
1979 KZ 1000 LTD - Parts bike and/or future project
1979 KZ 1000 ST
1980 GS 750 L
2003 ZRX 1200 R
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- steell
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He originally thought it was for the J, but when we checked it we found it was for the 1015 motor. I was going to buy it for a J, so I was a little disappointed.
KD9JUR
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- wireman
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- Duck
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if cylinder walls are scored or have any discernable ridge at the top you'll be going oversize.
if you want to measure bores you'll need a 3" micrometer and a transfer bore gage . i usually measure near the top and near the middle, front to back and side to side. specs are in the manual.
it takes a little practice to get used to handling and reading these tools. absent some precision gage blocks, take the reading of uncalibrated tools with a grain of salt. not a big deal because it's the variation that's of concern in measuring your bore and pistons.
You can get a decent 'made in china' set of micrometers 0-1", 1-2", 2-3" and a set of transfer guages for about $50 total. IMO, if you can get s Czech made set for not much more, grab it.
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- larrycavan
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the 1015 kit is gonna cost same as a 1075 kit except the boring.if you are going to do it id reccomend pulling the bottem end apart and checking everything and throwing in a cam chain while you are at it,that way you dont have to worry about it;)
I couldn't have said it better myself.
Dollar for dollar..all things considered....the 1075 motor with even a drop in cam makes a hell of a street motor...relatively cheap to build...power output is excellent....reliability is excellent and I've never known anyone who said..." I don't really see much difference over my stock 1015 motor" my all time favorite KZ street motor.
Post edited by: larrycavan, at: 2007/01/28 14:52
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- donthekawguy
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Rathdrum Idaho
1971 Kawasaki g3ss
1972 Yamaha R5 350
1965 Suzuki Hillbilly
1964 Yamaha 125
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- wiredgeorge
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ONCE you understand the condition of your cylinder bore, measure your OEM ART pistons. They are measured just below the piston pin holes on the sides. The DIFFERENCE between the cylinder bore measurement and piston diameter is the CLEARANCE.
If the clearance is within spec, you can install new rings after honing and expect to renew the original performance of the engine as far as the ring seat goes.
OK... IF the cylinder bores are consistent and within spec, you can also go with a set of aftermarket pistons/rings as well to raise compression a bit to increase performance and just hone the cylinders but if the bores are not within spec, you will need to rebore. Since aftermarket pistons don't come in rebore sizes, such as .020" over but only in OVERSIZE, you will need to go with a 1075cc set of pistons or a kit. You will need to buy the kit plus have the cylinder bored by a good machine shop and this will cost between $150 and $200 in most places. You will find that the small increase in displacement doesn't add much performance unless you go with 10.25:1 pistons AND add performance cams (and springs) which will now offer a noticeable performance bump. The 1075cc displacement at the original 8.25:1 compression with stock cams won't feel a whole lot different than a 1015cc engine with stock pistons and new rings.
wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!
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