J
Check out the previous posting on this forum (currently about 5 pages back) titled "78-80 CR250 Interchangeablility".
Robert
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| 1980 CR250 Bottom End with 1979 CR250 Top End? https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=666 |
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| Author: | J [ Tue May 24, 2005 9:57 am ] |
| Post subject: | 1980 CR250 Bottom End with 1979 CR250 Top End? |
Has anyone used a 1980 CR250 Bottom End in their 78-79 CR250? Is it possible? J |
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| Author: | redrocket190 [ Tue May 24, 2005 10:58 am ] |
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The complete crank assembly, bearing and oil seals are common between the 1978, 1979 and 1980 models. The crankcases have different part # but I remember someone saying that the complete motor (without top-end) will drop right into any one of these frames. The crankcase differences are minor - like additional strenghtening webs in the casting. |
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| Author: | J [ Tue May 24, 2005 1:33 pm ] |
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Thanks Michael! J |
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| Author: | Rhawes [ Fri Jun 03, 2005 6:15 pm ] |
| Post subject: | '79 and '80 CR250R Bottom-Ends |
J Check out the previous posting on this forum (currently about 5 pages back) titled "78-80 CR250 Interchangeablility".
Robert |
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| Author: | J [ Fri Jun 03, 2005 9:10 pm ] |
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Robert, How the heck are ya? I should have searched before posting. "All parts for the '78 to '80 CR250 bottom ends are pretty much interchangeable; however, there are several parts that were upgraded from year to year; the most noticeable would be the cases. The '78 cases lacked a shield behind the clutch lifter area (in front of the counter shaft) to protect the lifter recess when the chain gets tossed. Both the '78 and '79 left case halves lacked the three vertical support webbings at the area of the left transfers; which provide support to the base gasket area. And of course, everyone knows about the kick start pinion, clutch basket and ignition." I guess I still want to clarify. The 1980 CR250 lower-end will work and has improvements to the areas you mentioned (webbing, pinion and basket). I have a chance to pick up an 80 lower-end, but I don't want to waste my money if it wont fit my 78. Thanks! J |
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