0-Rings on bearings vs pins on Bearings

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speedjunkie_69
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0-Rings on bearings vs pins on Bearings

#1 Post by speedjunkie_69 » Thu Apr 30, 2015 10:08 am

Machine shop that rebuilt my crankshaft claims the O-rings are the better option 100%. I sent the crankshaft back to them because they rebuilt it non-oem. Now he's telling me I'd be better off leaving the O-rings and if I do decide to have the bearings replaced its going to be an extra $200+

They claim that they rebuild their banchee crankshafts with O-rings only and they are more durable and safer for the crankcases.

cheers

Norm

mkane
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Re: 0-Rings on bearings vs pins on Bearings

#2 Post by mkane » Thu Apr 30, 2015 10:25 am

Run with it.

speedjunkie_69
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Re: 0-Rings on bearings vs pins on Bearings

#3 Post by speedjunkie_69 » Thu Apr 30, 2015 10:43 am

mkane wrote:Run with it.
do you have any personal experience with these type of O-rings?

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2smoke
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Re: 0-Rings on bearings vs pins on Bearings

#4 Post by 2smoke » Thu Apr 30, 2015 11:38 am

The problem with the pins is that they don't always line up perfectly with the cutouts in the engine cases. (after a crankshaft rebuild)
The O-rings don't have that problem obviously.

I have never used the oring setup but I have never seen anyone post problems with it.
I would go with it.
Did you use CV-Tech?
Colin
79 RD400F Daytona Special
81 RD350LC
89 TDR250
75 Kawasaki H1 500
77 Can-am Tnt250

speedjunkie_69
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Re: 0-Rings on bearings vs pins on Bearings

#5 Post by speedjunkie_69 » Thu Apr 30, 2015 12:03 pm

Its happened the pins don't line up?

I'm really out of sorts here :( I had my friend pull out the crankshaft after reading on a forum the O-rings were so-so. He wasn't happy about it but agreed with me that it should had been OEM. Might have to wear body armor if I bring it back with the O-rings.....

yamasukiman
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Re: 0-Rings on bearings vs pins on Bearings

#6 Post by yamasukiman » Thu Apr 30, 2015 8:15 pm

It seems that a lot of the tz boys would pull a crank to bits and replace the oem pinned bearings with bearings like what you have been supplied.
Their reasoning was, when a main bearing seized it did not tear the crankcases to bits.
I would happily run with o ring'd bearings.

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L.B
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Re: 0-Rings on bearings vs pins on Bearings

#7 Post by L.B » Thu Apr 30, 2015 8:46 pm

O rings with some bearing retainer.

speedjunkie_69
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Re: 0-Rings on bearings vs pins on Bearings

#8 Post by speedjunkie_69 » Mon May 04, 2015 11:42 pm

2smoke wrote:The problem with the pins is that they don't always line up perfectly with the cutouts in the engine cases. (after a crankshaft rebuild)
The O-rings don't have that problem obviously.

I have never used the oring setup but I have never seen anyone post problems with it.
I would go with it.
Did you use CV-Tech?
CV-tech did the job. My only gripe with them is they installed the O-rings without contacting me first. Since I asked to rebuild the crankshaft that was an OEM Yamaha part I was surprised to see the O-rings instead of the pins. Not knowing much either way I took my brothers advice (he raced rd's in the 70-80's) and sent back the crankshaft to add bearings with pins. Its coming back instead with new O-rings after I had a long discussion with mike at cv-tech. This is such a learning experience and I'm finding this very frustrating (this restoration) when you don't do your homework first......

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2smoke
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Re: 0-Rings on bearings vs pins on Bearings

#9 Post by 2smoke » Tue May 05, 2015 1:56 am

I used CV-Tech before, they are good. Shipping from where I live is really expensive unfortunately.
They will do whatever you want, but they rely on you to supply the parts. If you don't supply the parts, they will do it their way.
Seriously, you are over-thinking it. The O-rings will be fine.
No worries. Use Yamaha OEM seals.
Colin
79 RD400F Daytona Special
81 RD350LC
89 TDR250
75 Kawasaki H1 500
77 Can-am Tnt250

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