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| H2 Cylinder ID http://kawi2strokes.com/forum/viewtopic.php?f=14&t=5644 |
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| Author: | Ja-Moo [ Mon Feb 18, 2013 11:22 pm ] |
| Post subject: | Re: H2 Cylinder ID |
I heard the liners start cracking at .080" with hard use. One reason kawi went with the lower cut outs. |
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| Author: | RODH2 [ Tue Feb 19, 2013 12:40 am ] |
| Post subject: | Re: H2 Cylinder ID |
^ Hmmm........ 17t front sprocket, and 7,000rpm redline maybe, 800cc would pull that easy! |
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| Author: | chazyH2 [ Tue Feb 19, 2013 5:49 pm ] |
| Post subject: | Re: H2 Cylinder ID |
Ja-Moo wrote: Must be the pic angle, the left cylinder liner sure looks thin, like it was .060 or .080 over. The "left" cylnder actually had a piston marked 0.5 which I think means 1/2mm oversize. The other one had 1.0 pistons (1mm over). I guess it boils down to the question of whether the cleanup on that set of cylinders won't affect the next overbore. Or bore the other set to 3rd oversize. |
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| Author: | RODH2 [ Tue Feb 19, 2013 6:50 pm ] |
| Post subject: | Re: H2 Cylinder ID |
If the porting is the same, I would bore the .5 cylinder. Some people have successfully run odd bores in a set!! |
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| Author: | chazyH2 [ Wed Feb 20, 2013 6:19 am ] |
| Post subject: | Re: H2 Cylinder ID |
RODH2 wrote: If the porting is the same, I would bore the .5 cylinder. Some people have successfully run odd bores in a set!! Rod, won't need to mix & match bores since I've got one set currently @ 0.5 (ported set) and the other set @ 1.0. I would be leaning towards boring the 0.5 set as long as the porting work done doesn't hurt anything. |
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| Author: | RODH2 [ Wed Feb 20, 2013 6:49 am ] |
| Post subject: | Re: H2 Cylinder ID |
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| Author: | chazyH2 [ Wed Feb 20, 2013 6:54 am ] |
| Post subject: | Re: H2 Cylinder ID |
| thanks .
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| Author: | Jim [ Wed Feb 20, 2013 9:00 am ] |
| Post subject: | Re: H2 Cylinder ID |
chazyH2 wrote: The "left" cylnder actually had a piston marked 0.5 which I think means 1/2mm oversize. The other one had 1.0 pistons (1mm over). Right. It gets confusing when .5mm over is called "20 over", referring to thousandths of an inch, because the pistons are accurately sized to mm, not inches. New pistons, at least Wossners, are made so if you were to machine the bores to the exact size in mm, for example 1mm over for 2nd overbore pistons, the clearance would be what they specify. |
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| Author: | don k [ Wed Feb 20, 2013 10:11 am ] |
| Post subject: | Re: H2 Cylinder ID |
Jim wrote: chazyH2 wrote: The "left" cylnder actually had a piston marked 0.5 which I think means 1/2mm oversize. The other one had 1.0 pistons (1mm over). Right. It gets confusing when .5mm over is called "20 over", referring to thousandths of an inch, because the pistons are accurately sized to mm, not inches. New pistons, at least Wossners, are made so if you were to machine the bores to the exact size in mm, for example 1mm over for 2nd overbore pistons, the clearance would be what they specify. All quality piston mfg. size piston like that... Some are closer than others though. Don |
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| Author: | Jim [ Wed Feb 20, 2013 10:50 am ] |
| Post subject: | Re: H2 Cylinder ID |
Thanks Don, I thought that was the case these days, but I've only had the chance to verify it with Wössners. They were accurate to the nearest "tenth" (0.0001"), which is the best I can measure here. |
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