starstream in to vega bearings.

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starstream in to vega bearings.

Post  boozee on Thu Dec 18, 2014 2:07 pm

hi, just wondering what bearings and seals to order,to fit the starstream internals in to vega case. are they the same as standard vega ones. cheers.

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Re: starstream in to vega bearings.

Post  trotsky on Fri Dec 19, 2014 11:06 am

Hi Bozee, yep bearings & seals should be the same, just need to be 4 speed, not 3 speed.
The only thing you need to identify is if your Crank & Mag are ball bearing or 3 piece bearing combinations, so you can replace with the correct bearing & inner Mag seal, as the inner Mag seals are different also.

3 piece bearing Mag - 20050014, 1 piece Ball bearing Mag - 20950045.

Hope this helps.....Steve         P.S. there is a post with pictures to help in tech Tips....


Last edited by trotsky on Sat Dec 20, 2014 2:08 am; edited 5 times in total
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Re: starstream in to vega bearings.

Post  mickey c on Fri Dec 19, 2014 1:18 pm

This is good to know as I hope to. I'm attempting the same modification over Xmas period. I'm hoping most of the original bearings will be ok, or am I just being tight?


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Re: starstream in to vega bearings.

Post  trotsky on Fri Dec 19, 2014 1:46 pm

Hi Mickey, as you will have the motor apart, to me it would be a good time to renew bearings & seals. Unless you plan on doing serious miles on it, you'll only ever change them the once.
Obviously 1st check the current bearings for play & if they run free & smooth with no side play, then maybe just consider changing seals? Also check big end play on the crank. If it is only going to be a stock 125, then you have some scope with tolerances but, if you are doing a 135/140 conversion then everything needs to be in good fettle.
My opinion is unless you know the history of the donor parts, then for the piece of mind & cost of a set of bearings, I would be inclined to change them.
Always change both sides if you are going to replace one bearing, that way going forward you know all is even ref mileage & wear on both sides.....Steve

P.S. On the 3 piece crank there is a spacer shim between the inner race & crank cheek, try to save it if you renew your Mag-side, as SR only have a thicker shim now. Hope this helps....


Last edited by trotsky on Sat Dec 20, 2014 2:11 am; edited 1 time in total
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vega bearings

Post  boozee on Fri Dec 19, 2014 3:45 pm

cheers steve, the engine im stripping has been rebuilt, but as im doin tzr conversion i think ill take no chances with using the starstream bearings and go for new ones.as you said to mikey i dont really want to build it a second time especially with the extra power of the 135. Very Happy

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Re: starstream in to vega bearings.

Post  mickey c on Sat Dec 20, 2014 4:34 pm

You are both right if course. I 'll only regret not changing them. Now if could only get the engine out of the frame (the engine bolt is seized solid) I can get cracking.

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Re: starstream in to vega bearings.

Post  Snails on Sun Dec 21, 2014 2:46 am

mickey c wrote:You are both right if course. I 'll only regret not changing them. Now if could only get the engine out of the frame (the engine bolt is seized solid) I can get cracking.

This fella cant be far away, eh Mike?

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Re: starstream in to vega bearings.

Post  Snails on Sun Dec 21, 2014 2:48 am

Mike, if you do start stripping your engine note whats been said in other posts about mag flange extraction. DONT try to use the method you'd use on a series 3 and push it out with some M8 bolts
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