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5 Jun 2017
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XT600 Engine rebuild questions (crank, bearings, valveseals etc)
Hi all,
New here with a XT600Z 3AJ from 89.
I'm currently in the progress of rebuilding the engine and have some general questions:
1) I've seen an excellent topic here from 8 years ago regarding bearings ( this one ) and was wondering if there is any update on this?
Is C3 sufficient for a lot of KMs or is it recommended to use C4?
I'm thinking about replacing all bearings with SKF/FAG ones. I can get C4 SKF for 25euros.
2) If I want to get the main bearing off of the crank, I will need to put it back in the same spot with a gap in between the crank and the bearing. Is this a fixed gap or do I just measure it and put it back approximately? It seems kinda vague to me.
3) I'm also replacing the valve seals. Are aftermarket ones any good? OEM ones will be €50 total...
4) I can also order everything aftermarket from Kedo.de (bearings, valveseals), but there's no info on these items. Are these any good?
Thanks!
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5 Jun 2017
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3: Regarding valve seals, theyre inkluded in the gasgetkit from Kedo, and work fine. Be carefull when you install them.
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5 Jun 2017
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Quote:
Originally Posted by Jens Eskildsen
3: Regarding valve seals, theyre inkluded in the gasgetkit from Kedo, and work fine. Be carefull when you install them.
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Really?
In this one?
KEDO - Product Details
edit:
"ventilshaftdichting" on the catalog, I guess that's it  . You just saved me 12 euros
I wish they would put more info on the products though, the kedo bearings don't have any info.
edit: just got word from kedo: the bearing they sell is a C3 bearing... makes me think, I guess C3 is fine too?
Last edited by Doubleyoupee; 6 Jun 2017 at 08:20.
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6 Jun 2017
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You can see the valveseals in the middle of the gasgetkit =)
I haven bought enginebearings for mine yet, but I would trust Kedo to provide the right parts.
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6 Jun 2017
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Quote:
Originally Posted by Jens Eskildsen
You can see the valveseals in the middle of the gasgetkit =)
I haven bought enginebearings for mine yet, but I would trust Kedo to provide the right parts.
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Well apparently they are C3 bearings. I can get those for very cheap.
I wonder why yamaha is using C4. I think these still have play when under operating temperature, while C3 do not. (or not as much).
I can't really find any decisive info. It's too bad the yamaha ones are so expensive.
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6 Jun 2017
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There is some instances where the wrong spec bearing will cause vibrations under certain rpms and may be more likely to have the balls skid in the races rather than roll smoothly (also a cause of vibration) . I do wonder why it would be the Yamaha had the special spec , but C4 is a (looser) tolerance than C3, IIRC ,Honda aircooled motors have the same spec.
Last edited by jjrider; 8 Jun 2017 at 22:42.
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