400 restoration project

These posts document restoration experiences of our members

Re: 400 restoration project

Postby Barrie2777 » Tue Feb 07, 2017 10:05 pm

I didn't do a complete description of rebuilding the recoil because I had done it and posted the details somewhere on this site. I think a little searching will find it. I found it...go to the home page under Bolens Husski information
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Barrie2777
 
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Re: 400 restoration project

Postby Barrie2777 » Thu Mar 02, 2017 5:23 pm

With less than one winter's riding my recoil was not returning. Mystified by this since all the interior parts were new, I took off the cover plate to discover a common problem for jlo recoil had struck. When the pawls release the starter hub, they bump against a cast aluminum ridge. After many years of use the ridge can break away. Why this happened after such little use I'll never know but a recoil rebuild is in order. Three day val des bois ride starts tomorrow!!
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Re: 400 restoration project

Postby Barrie2777 » Fri Mar 03, 2017 12:13 am

Further inspection finds that one of the pawl return springs was unhooked. Operating like this, a bump would cause it to try to engage the starter hub. Of coarse this cannot happen at operating revs so it is bounced back hard against that ridge causing the breakage. This is my best answer for this break.
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Re: 400 restoration project

Postby Jano » Sun Aug 13, 2017 11:05 am

Bruce,
In regards to your post on the mechanical advance on JLO, I now think I know what you mean.I just took apart two JLO 292 engines to find that they have a similar mechanism in the flywheel. No cam or spring on the shaft like the 252 but the cam is attached to the flywheel with that spring mechanism moving it slightly via centrifugal force. I am no expert at this but now I have to figure out how to make the 292 rotate in the opposite direction. As Barrie once said, 252 parts are probably required, like cam spring and flywheel.

Jeannot
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Re: 400 restoration project

Postby Jano » Sun Aug 13, 2017 11:09 am

Oh yeah Barrie,
The stop switch at Canadian Tire UN 28770 is 12 volts and is too big for the JLO, the stem being well over the required half inch needed. Maybe good for a Diablo.
Jeannot
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