before are the std sizes and service limits for the cylinder and piston listed.
take a calculator and you will know what is new or worn clearence size.
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| CR-250M Cyl. to Piston Clearance https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2933 |
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| Author: | VICMC [ Tue Jan 18, 2011 5:18 pm ] |
| Post subject: | CR-250M Cyl. to Piston Clearance |
Hi, I have a CR250M I'm rebuilding and possibly thinking of doing some Vintage Racing. I managed to get a new 1st over piston, and thats what i took out but it has pre-ign damage. But I'm starting to rethink how much clearance there was supposed to be. The Clymers manual I have isn't specific enough about the piston to cylinder clearance measurement. I'm hoping that someone may have the factory specs. Does someone have the piston to cylinder clearance for a rebore, and also for the service limit. Does someone have the specs out of the factory manual? Or have a link or file of the factory manual. Thanks for your assistance |
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| Author: | rayivers [ Wed Jan 19, 2011 11:28 am ] |
| Post subject: | Re: CR-250M Cyl. to Piston Clearance |
The '73 CR250 manual indicates about .002" minimum piston clearance. The manual is available here, for the other specs: http://www.alp-sys.com/honda-elsinore/m ... cr250m.pdf Ray |
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| Author: | b-joe [ Wed Jan 19, 2011 2:21 pm ] |
| Post subject: | Re: CR-250M Cyl. to Piston Clearance |
don´t know what kind of clymer you have, mine says 0,06-0,07mm (0.0024-0.0028 in.) |
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| Author: | VICMC [ Thu Jan 20, 2011 11:51 am ] |
| Post subject: | Re: CR-250M Cyl. to Piston Clearance |
The Clymer manual does state the piston to cylinder clearance as you noted, but it does not indicate if .0024-.0028 is the clearance from new(or when re-boring), or the service limit(wear limit). To me those specs are not clear enough. |
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| Author: | b-joe [ Fri Jan 21, 2011 9:50 am ] |
| Post subject: | Re: CR-250M Cyl. to Piston Clearance |
before are the std sizes and service limits for the cylinder and piston listed. take a calculator and you will know what is new or worn clearence size.
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