Skyway 66 keyway fail

Ok, so I tried to replace the front drive cog that came with my Skyhawk 66. The cog they sent me was had a larger diameter hole than the one that broke. I did find one that did work but the keyway was not the right size. So I made a keyway and I thought it was the right size.

After fifteen hours of runtime I pull up to a light close to my house and I think that my clutch pads were not engaging. Turns out that the keyway broke and then the cog unscrewed itself. I just got done making another one. I had to go to the hardware store and buy a keyway that was much bigger and then cut and grind it to size.(burnt my fingers grabbing the metal after I hacksawed it)

Has anybody else had this problem?

mike

 

Never broke any key in 5 engines...I have read that some had, very few tho. Not a common occurrence, at least it wasn't discussed.

 

I hear of a fair amount of woodruff keys getting chewed up. Seems that once a motor eats one, it will ALWAYS eat them. It's never a one time occurrence.

But, I'd just suggest to buy a replacement from a retailer online, and while you're at it get the right cog for your motor.

 

cogs in question

The main problem I have is that with this current lower end is that the main dive shaft is set up very well with a sealed bearing. I guess they changed the specks on the shaft, because the new ones have a larger diameter.

I am thinking that may be part of the reason it was on sale for a hundred bucks a year and a half ago. I was lucky that I kept my old dead lower end from a engine that ate its C clip.

I made a new key today and I put blue lock tight on the nut to hold it in place I am waiting till tomorrow to give it a try. I think that its packing more horsepower than the posted 2.75, tuned pipe and thinner head-gasket, hot spark plug with a shielded wire running super with 32 to one gas.

When its going its really going ,But when its not I am walking or pedaling VERY SLOWLY.

mike

 

Nope, in many dozens of builds over past 7 years, never had keyway fail.