Needle bearings?

Do you guys think this looks good?:
70cc ACME Round Head Motorized Bicycle Engine Kit - eBay (item 320236483584 end time Apr-12-08 10:16:54 PDT)
I guess this engine kit has modified needle bearings, and a couple other mods, I don't quite understand enough to know what the benefit of these mods are. I'm looking for a new 70/80cc engine, and if this is better I might as well get it.
When I originally bought my first engine, it was called 80cc. Is it actually NOT 80cc's? I get the impression that it is 70cc, and I think I read somewhere that they are actually 65cc or something. Whats the deal?

Actually they are 67.5cc's.

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If it ain't broke, and you mess with it long enough, it will be.

I think all the engines come with needle bearings now. They are an improvement over the old brass inserts they used in the beginning. But I think they all have them now.

I'm not sure that tiny bit of difference in the cc's makes a huge amount of difference.

If I were looking for a new kit I would be looking at the clutch handle since it is the only real difference as far as I personally can see. I'm sure some of the sellers will point out my obvious errors in thinking. I also would not pay much more for the better handle since you can buy it after market for a few bucks.

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"I think all the engines come with needle bearings now. They are an improvement over the old brass inserts they used in the beginning. But I think they all have them now."


You can still buy the "old style" bushed engines from that's dax (ebay I.D. dacscommm), there are some on there right now.

Sometimes, a bushing is better in the long run....more surface area. We'll have to see how the new engines hold up in comparison to the old style.

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If it ain't broke, and you mess with it long enough, it will be.

from my understanding also the bearings will not fit the bicycle motor that has the old brass style

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You are correct sir!

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If it ain't broke, and you mess with it long enough, it will be.

I Too was curious about these Acme round head motors.I received a response from the sellerMotorized Bicycle Engine Kit Parts 2 stroke 4 cycle kits REVOLUTIONCYCLES.US
He says compared to the square head version they have a little less low end torque,a higher top end,and less vibration.Engine only with carb and cdi=$145.00
shipped.Not a bad price.Ron

Be advised that this seller has not been the best of experiences for several folks in the past.

I'll leave it at that.

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If it ain't broke, and you mess with it long enough, it will be.

Bikeguy
Thanks for the heads up.Ron