thedog wrote:
Somewhere I read of drilling to small holes 3m down from the bottom ring on the intake port will help the piston oiling, has anyone heard of this, if so please share some thought.
only if the exhaustport is bridged.
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| Rebuilding 1976 Cr250m Cylinder question https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=4144 |
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| Author: | thedog [ Sat Aug 31, 2013 6:17 am ] |
| Post subject: | Rebuilding 1976 Cr250m Cylinder question |
Started rebuilding a Cr250m 1976 model engine, The piston that was thought to be stock 70.0m had a 50 stamped onto it, the bore is measuring around 70.5m, my problem is the bore is scratched. How much can this cylinder be bored out again since it is already .50m over, please respond need to know my options, don't think resleeve is a option |
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| Author: | rayivers [ Sat Aug 31, 2013 7:31 am ] |
| Post subject: | Re: Rebuilding 1976 Cr250m Cylinder question |
Wiseco makes 70mm to 72mm pistons in .5mm increments (338M07000, etc.). Ray |
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| Author: | thedog [ Sun Sep 01, 2013 6:22 am ] |
| Post subject: | Re: Rebuilding 1976 Cr250m Cylinder question |
I wanted to keep original bore of 70.0m but hard to find the jug, so I will take mine from 70.5m up to 71.m just to clean and true it up a bit. Somewhere I read of drilling to small holes 3m down from the bottom ring on the intake port will help the piston oiling, has anyone heard of this, if so please share some thought, I will be going Wiesco |
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| Author: | b-joe [ Sun Sep 01, 2013 7:52 am ] |
| Post subject: | Re: Rebuilding 1976 Cr250m Cylinder question |
thedog wrote: Somewhere I read of drilling to small holes 3m down from the bottom ring on the intake port will help the piston oiling, has anyone heard of this, if so please share some thought. only if the exhaustport is bridged.
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