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Garden Tractors and Mowers Vintage lawn and garden tractors, mowers, snow blowers, snowmobiles and other old machinery that is driven by small air cooled engines.

Garden Tractors and Mowers

'79 Motobecane moped problems!


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  #1  
Old 09-21-2008, 09:30:10 PM
TheEngineGal TheEngineGal is offline
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Default '79 Motobecane moped problems!

A friend of mine was riding her 1979 Motobecane Mobylette moped and the chain slipped off and the engine revved for just a minute before she stopped it. Now it won't run, and mopeds aren't my area of expertise. She says it won't engage the engine when she tries to start it. There is no clutch to engage the engine, you just pedal or push it and it starts. It just coasts without turning over the engine. Can anyone give me some pointers before I go and look at it? I wouldn't think that would blow the engine out.
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  #2  
Old 09-22-2008, 09:51:56 AM
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David M. Lyon David M. Lyon is offline
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Default Re: '79 Motobecane moped problems!

If it's like the old Mobelettes we had back in the early sixties, (when I was slim & trim enough to ride them) there was a primary drive belt and a torque converter clutch sorta' hook up from the engine to the drive sproket that gave a good bit of trouble. I don't have any idea about your model, but it's worth a look!
Seems like the motor used to pivot to the rear as the bike picked up speed to take up the slack in the belt as the converter changed pulley size. But, HEY! ...that was LONG time ago.
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Old 09-22-2008, 10:19:49 AM
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Default Re: '79 Motobecane moped problems!

Here's a link to a breakdown of the clutch on one of their models http://www.themopedjunkyard.com/motobclutch.html,it looks like a pretty simple centrifugal clutch.I can't imagine that it would have blown the engine by over revving for a few seconds,but it could have broken a spring in the clutch or something like that.
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Old 09-22-2008, 10:23:22 AM
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Default Re: '79 Motobecane moped problems!

There is also a lever to disengage the engine on the big pulley for the belt. Maybe it got flipped to the neutral position.

Kinda wish I still had mine now.
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Old 09-22-2008, 06:14:17 PM
TheEngineGal TheEngineGal is offline
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Default Re: '79 Motobecane moped problems!

Ok, I'll probably get to looking at it saturday. These will defiently help! I'll let you know how it goes.

Thanks!
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Old 09-25-2008, 06:35:12 PM
Ed Radtke Ed Radtke is offline
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Default Re: '79 Motobecane moped problems!

running a variable pulley without a belt on it can cause the shoes to run out and jam.It can also turn into a hand grenade.
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Old 09-27-2008, 11:57:10 AM
TheEngineGal TheEngineGal is offline
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Default Re: '79 Motobecane moped problems!

Quote:
Originally Posted by krawlr View Post
There is also a lever to disengage the engine on the big pulley for the belt. Maybe it got flipped to the neutral position.

Kinda wish I still had mine now.
Krawlr, There is a lever on the belt pulley, is that what you are talking about? It seems to have a little hook placed in a sproket type thing. I cannot get the lever to move. I wanted to try to do this before i take the clutch apart. Do you remember how to move it? I think this is what you are talking about.
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Old 09-29-2008, 11:18:57 AM
TheEngineGal TheEngineGal is offline
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Default Re: '79 Motobecane moped problems!

Alas, the lever is in the correct position, so I must order a little puller for the clutch. A spring must have come off.
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Old 09-29-2008, 01:45:05 PM
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Default Re: '79 Motobecane moped problems!

Sorry I didn't see this sooner. Sounds like you have a plan though.

Going from memory my lever looked more like a wingnut and it would put a pawl into a gear and lock them together. You could see them on the back side of the big pulley. I think you had to fuss with it if the gear and pawl didn't line up.

I rarely used that disconnect since it was hell to pedal those things.
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Old 09-30-2008, 03:57:29 PM
TheEngineGal TheEngineGal is offline
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Default Re: '79 Motobecane moped problems!

Got it going again. Don't know what was wrong with it!
Oh well, one less thing I have to worry about!
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Old 09-30-2008, 04:21:52 PM
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Default Re: '79 Motobecane moped problems!

I always like having an engine heal itself,that is until the problem comes back again.Maybe you'll get lucky on this one.
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Old 09-30-2008, 07:46:50 PM
TheEngineGal TheEngineGal is offline
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Default Re: '79 Motobecane moped problems!

Ha! Hope I get lucky this time!
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Old 10-01-2008, 10:03:52 AM
rebelmoby rebelmoby is offline
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Default Re: '79 Motobecane moped problems!

For Motobecane moped problems you need to go here Mabecane Mobylette Forums for help or whatever.
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