Lambretta mag housing nightmare, all help appreciated !

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Main scooter: Lambretta Li150 special

Mon Oct 06, 2014 2:19 pm

Just bought an Li125 special to restore and when trying to remove the mag housing by winding in some bolts the threads gave way so I had to resort to heating around the outside and tapping it from behind.... thats when it all went wrong ! The whole outside of the housing came off leaving the bit that fits into the casing still jammed in and flush with the casing. I wasnt even hitting it hard and was using a rubber mallet and some wood positioned on the thickest parts I could see.

Any help much appreciated

Thanks in advance

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Mon Oct 06, 2014 2:47 pm


if you are willing to sacrifice the crank, then you may get some movement by taping the crank and the remaining piece out from the drive side.
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Mon Oct 06, 2014 3:48 pm

I'I'd agree with bristolmod, I can't see how you can get it out without damaging the crank.

The only thing I could add is use loads of heat on the outside of the casing whilst tapping the cranks drive side.

Good luck!

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Mon Oct 06, 2014 4:23 pm

push the rod back so it dont catch wh n you hit y crank
C’est la vie

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wack 63
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Mon Oct 06, 2014 5:37 pm

I had the same on an old Indian motor, tried everything to shift the mag. In the end I drilled/ Dremelled a section of the mag spigot out which gave some free play to finally knock it out with the crank.

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Main scooter: Lambretta Li150 special

Mon Oct 06, 2014 6:58 pm

Thanks for the advice guys, it looks like it will be a pig to get out, I will update this thread to let you know how I got on.

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Mon Oct 06, 2014 8:36 pm

Same happened to me with my special and as suggested above, I knocked out with the crank. If you put a bolt in the end of the crank then you may not damage the crank in the process. I was going to use a GP crank so wasn't bothered.

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Mon Oct 06, 2014 8:47 pm

Saw down a piece of hard wood (not IKEA-'planking') so it fits snug between the crank halves and put a bolt in the driveside of the crank threads.
Boil a couple of liters of water and pour over the crank housing and immediatly beat the driveside crank end. You may be able to get it moving like this...
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Tue Oct 07, 2014 12:45 am

Now you knackered the mag housing you could try plug tap the original holes bigger size like m8, a lot of heat ...nothing to loose

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Tue Oct 07, 2014 2:34 am

What would I do? I would tap a few new M6 holes, or use M6 Time-Sert inserts in the old stripped holes, then use this tool to remove the mag flange: ... ts_id=1572

Heating the actual case around where the mag-flange fits would also be helpful.

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