motobecane av10 athena 39mm 50cc kit
motobecane av10 athena 39mm 50cc kit

alternate reality price $140.00


athena 39mm 50cc air cooled kit for motobecane AV10!

includes everything you see - cylinder, piston, rings, wrist pin, clips and gaskets (head, base and exhaust)

taco rating 2.5 of 5 Total Reviews: 2 give your taco rating here

  1 taco eaters like this review
Youre doing it wrong January 26, 2016
taco eater : The Train from United States  
If you buy this kit, it will take a little work, just like most kits.
In this case, youre going to want to space the cylinder up until the piston clears the exhaust floor at BDC. You dont want the ring exposed to that heat. Once this happens, your squish is now too thick. Your bottom end torque will suffer, your cylinder will struggle to scavenge and push the charge towards the center/spark plug and you wont have the performance you desire. In extreme cases it could cause detonation. Besides matching this kit with a head that has proper squish, youre going to want to mill some off the top of the cylinder to offset what you raised up by spacing the cylinder away from the cases. Like I said, you should be making these adjustments to almost any kit you are installing, for the best performance. Sometimes its just a thick base gasket, sometimes its a spacer and 2 gaskets. Bust out that micrometer and get to work.

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  1 taco eaters like this review
what the June 18, 2012
taco eater : cat teets from Albany, NY United States  
This must be some kind of stock drop in replacement kit.

I put it on a stock av10 case with a full cheek crank and had to raise the base up about 0.4mm  to keep the piston from slamming into the doppler head. Then more fine adjustment to account for squish... The piston doesn't clear exhaust at bdc by maybe 1.5mm after base gasket adjustments.

Otherwise the materials and finish are very high quality, just the actual design is shitty. The goal of this engine for me is to make a reliable and quiet daily driver / rally loaner, it should accomplish that.

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