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Post by kostas on Nov 5, 2013 16:59:57 GMT 1
Hi,
Took my engine apart last week (350 31K) and the crankshaft is a bit gone.
The bearings are shot the lab seal has a fair bit of play, don't know if that's normal, but the worse is that two of the bearings have the inner race spinning on the crankshaft journal and the seal has made a fairly deep groove on the journal.
So what's the verdict?? I guess the loose inner races have damaged the journals beyond repair.. Is that right?
Thanks
Kostas
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Post by bare on Nov 5, 2013 18:26:17 GMT 1
Needs dismantling and careful inspection by a decent crank rebuilder...before deciding.
Do remember that an OEM crank, rebuilt (competently) using ONLY! Yama oem bits is a Leagues better/stronger unit than ANY SE Asian imitation.
I wouldn't discard it without serious evaluation.
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Post by billy on Nov 12, 2013 3:52:03 GMT 1
No don't bin it!!! Take it apart and keep the spares that are still OK, if there are any ufcourse. Or, heck, if you cant bother, just give it away to someone that wants to take it apart to see if there are any salvagable parts left on it. I think genuine Yamaha parts like this should be salvaged, not just thrown away. I actually recently scrapped a 125 LC crank. The only part worth saving was the r/h crank web as rust had been eating away at the crank quite severely. But yeah, now at least there is an extra r/h crank web available in the world that are perfectly fine except some cosmetic rust (too bad it usually is the l/h web that goes). Most people would have thrown the entire crank away which is a bloody shame.  |
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Post by kostas on Nov 12, 2013 18:43:10 GMT 1
I had a look at Norbo's parts shop and calculated the cost of parts needed to rebuild this crank and the price is exactly the same as the exchange cranks.
Anybody knows what qualtity the bearings are when it comes to Norbo's cranks?
Are those as good as the Yam ones or maybe even better?
Not going to actualy bin the crank, as you said Billy, even the last usuable part is worth holding on to.
Kostas
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Post by marsbar350 on Nov 12, 2013 18:49:50 GMT 1
think he uses koyo bearings
small upgrade fee for TZ bearings
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Post by kostas on Nov 12, 2013 20:51:24 GMT 1
Koyo is what yam fits, isnt it?
Is there a need for TZ ones for a standard street ride?
Kostas
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Post by marsbar350 on Nov 12, 2013 20:56:58 GMT 1
TZs think they have an extra roller in them
you best ask norbo he is more informed than me
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Post by ngordoncrosby on Nov 13, 2013 7:26:54 GMT 1
Norbo is all over the crank as I am doing mine at the moment,and know nothing about them,so I have been bugging him everyday about what I need
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Post by Norbo on Nov 16, 2013 9:47:11 GMT 1
TZ ones are tapered and you need to mashean out the casings to fit them . and you need to fit straight cut gears on the primary drive with them . Normal Jap bearings are good enough for most people .
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Post by carioca656 on Nov 16, 2013 10:26:57 GMT 1
TZ ones are tapered and you need to mashean out the casings to fit them . and you need to fit straight cut gears on the primary drive with them . Normal Jap bearings are good enough for most people . hi norbo why do you need to fit straight cut primarys with tz bearings? |
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