XR100 ring gap

  • mark1122
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XR100 ring gap

18 Oct 2023 12:48
#890623
Hi Guys. I am rebuilding a 1994 XR100 Honda trail bike. the manual says the ring end gap should be .020".
in the car world and Larger bikes i have done, the standard for setting end gap is .0035" per inch of bore. the piston in this bike is only 2 ". so it would be normal to set the gap at .007" for this . can anyone explain why honda would use such a large gap?
Thanks
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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  • Nessism
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Re: XR100 ring gap

18 Oct 2023 13:13
#890624
.020" sounds like a "service limit".  Do you have the real Honda manual, or a Clymers (or similar)?

As a datapoint, the Suzuki GS250 twin, 125cc/cylinder, lists the spec as .004-.012" for "new" rings, and .028" as the service limit.

 
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread

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  • mark1122
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Re: XR100 ring gap

18 Oct 2023 13:27
#890625
Nessism wrote:
.020" sounds like a "service limit".  Do you have the real Honda manual, or a Clymers (or similar)?

As a datapoint, the Suzuki GS250 twin, 125cc/cylinder, lists the spec as .004-.012" for "new" rings, and .028" as the service limit.


You R way Tooo SMART.  And sooo right. I just rechecked the Honda manual. It is indeed the service limit. It makes sence now.
Thanks

 
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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