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4 Stroke Bicycle Engines & Kits 4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine

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  #11  
Old 03-04-2012, 04:39 PM
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Default Re: 4G T drive bearing conversion

Quote:
Originally Posted by cobrafreak View Post
There is always a work around.
I agree completely. And that's part of what makes these bikes so much fun. They are a great test of a person's shade tree engineering skills.

This idea sounds great, I'm gonna try it.

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  #12  
Old 03-04-2012, 05:11 PM
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Default Re: 4G T drive bearing conversion

Please keep us updated if you do try it Aleman. Cobrafreak may be onto something really good here.
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  #13  
Old 03-05-2012, 05:27 PM
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Default Re: 4G T drive bearing conversion

I've been thinking of adding a needle bearing and giving that a try.Either way I think most of us would feel better opening the clutch bell by a mm then dealing with the engine shaft.So maybe instead use a (6) 15x21x4 bearings or 16x21x4. I may try a sigle needle bearing which is 15x21x22mm.Just putting this out there.
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  #14  
Old 03-05-2012, 05:35 PM
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Default Re: 4G T drive bearing conversion

<removed out of protest to certain "staff" practices in this forum.>
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Last edited by The_Aleman; 03-14-2015 at 08:42 AM.
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  #15  
Old 03-05-2012, 06:25 PM
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Default Re: 4G T drive bearing conversion

To use needle bearings you need to weld up the woodruf key slot and grind or it will destroy the needle bearings. Unless you sleeve it, but it may be too large then.
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  #16  
Old 03-05-2012, 08:46 PM
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Default Re: 4G T drive bearing conversion

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Originally Posted by cobrafreak View Post
To use needle bearings you need to weld up the woodruf key slot and grind or it will destroy the needle bearings. Unless you sleeve it, but it may be too large then.
Thanx Cobra I'm not really sure how this will or will not work but here is the oneI was going to try http://www.ebay.com/itm/360216225850...84.m1438.l2649 I believe this is sleeved
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  #17  
Old 03-05-2012, 10:18 PM
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Default Re: 4G T drive bearing conversion

No, it's not sleeved. It has an outer race only, not an inner one. When the needle bearings spin around on the shaft they are going to get abused and the keyed shaft and fail unless you can fill the keyed groove for the woodruff key in solid with weld and grind it perfectly. The outside diameter of the bearing needs to be 20mm or you will need to make the hole larger in the clutch bell, and again, it will need to be precise. Personally I think needle bearings would be better in this application but they require perfect races, which is why I decided not to go this way. With the sealed cartridge bearings I chose they already have the inner and outer race. You just need to make a reasonable tight and strait fit and it will work a TON better than an oil-lite bushing. But alas, there are many ways to skin a pig. I just chose one way.
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  #18  
Old 03-05-2012, 10:57 PM
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Default Re: 4G T drive bearing conversion

<removed out of protest to certain "staff" practices in this forum.>
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Last edited by The_Aleman; 03-14-2015 at 08:42 AM.
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  #19  
Old 03-05-2012, 11:44 PM
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Default Re: 4G T drive bearing conversion

It's really quiet other than the engine idle. Not totally gone but 90% is.
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  #20  
Old 03-06-2012, 12:14 AM
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Last edited by The_Aleman; 03-14-2015 at 08:42 AM.
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