Bicycle Motor Refuses to start

Mopedamauter79 · #91 (**permalink**) 04-23-2008, 02:02 PM

Well it definitely doesn't have this key. However I can't tell u when or how it came off. I only opened the cover after I tried everything.

**CRUISER** · #92 (**permalink**) 04-23-2008, 02:08 PM

if the bicycle motor was runing before i would think the key was thier and probably broke or whatever and was lost. i do beleive the key must be thier for the motor to run

**Norman** · #93 (**permalink**) 04-23-2008, 02:37 PM

No key operations are possible but it requires a tapered shaft and a tapered hub and both need to be lapped together. You have neither so if you want it to run you will need a key to fit the shafts slot and the rotors slot and they should be fairly tight in the slot. The rotor requires a wood ruff key on all my engines it looks like a half moon. If this picture is of your engine it looks to be wallowed out there is a good possibility your engine is done for with the way the key way looks there is ways of fixing it but you talk like you do not have the abilities to do the repairs that will need to be done. I suggest you get someone else to do the required repairs and or purchase a new engine. the one you have will be a tough one for you to fix.
You will need to machine a new key slot you will at the least need a dremel with a metal cutting disc and more likely need to split the case to get enough room to get the tool on the shaft to cut the slot. I dought if you want to tackle that. you might be able to use the damaged key way and hand make a special key to fit snugly on the shaft and the rotor both will take some work and you will not be able to buy the item off the shelf. So its your choice to do what ever you want to it. I will still offer my help but I can't promise I'll be able to make it work.
Take a picture of the rotor and its keyway if you can I'd like to see if its ate up like the shaft.

**Bikeguy Joe** · #94 (**permalink**) 04-23-2008, 03:17 PM

Norm, he said that was just A picture, and not of his engine....or so I thought.

Still, he needs to put a key in there and go ride.

**Bikeguy Joe** · #95 (**permalink**) 04-23-2008, 03:20 PM

Quote:

Originally Posted by Mopedamauter79

Is it worth the hassle of fighting with this thing on a daily bases trying to figure out why it's not working.

I'd sh*tcan it and start from scratch or find a less demanding hobby.

Mopedamauter79 · #96 (**permalink**) 04-23-2008, 05:24 PM

I was sure I posted a picture of the key way ..Anyway I will post the pic again.

Here is the pic I took today with my roommate's digital cam. Oh and I FOUND the key! It was stuck to the magneto.

Pic without the key and a picture WITH the key.

deacon · #97 (**permalink**) 04-23-2008, 08:22 PM

Question from the villiage idiot... can you use jbweld to hold that key in place if it isn't wallowed out too badly.

Pablo · #98 (**permalink**) 04-23-2008, 08:35 PM

Quote:

Originally Posted by deacon

Question from the villiage idiot... can you use jbweld to hold that key in place if it isn't wallowed out too badly.

There is only one saying when it comes down to JB Weld. "Worth a shot!"

deacon · #99 (**permalink**) 04-23-2008, 08:56 PM

My thinking if there isn't too much movement it should help anyway. Maybe keep it from falling out again.

toytime · #**100** (**permalink**) 04-23-2008, 09:16 PM

My thinking is that sudden stops, like letting the clutch out to kill the engine is what does things like this to an engine. If it was my engine I would try the JB weld and drive with extra care. If that did not work my next step would be to make a custom key that would take care of the extra wide key way. after that I would weld 4 tiny welds with a mig welder to hold it in place and leave the nut off if needed. A weld at 12 o'clock,then 6,3 and 9 o'clock. Yes there is the possibility of screwing up the seal but one weld at a time may be OK. From looking at his pics, I don't think things are as bad as he makes out but it's hard to tell.