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Happy happy, joy, joy..

Posted by Brickboy on March 9, 2025, 7:15 pm

I've fixed my stuck ATD problem and put everything back together with all carb and ignition settings to standard as per the book.

I now have a bike that rips off down the road, accelerates strongly in high gears under load and has the top end performance a 500cc single should have. I reckon I've solved a problem.

What a great day!

Re: Happy happy, joy, joy..

Posted by ChazzyB on March 9, 2025, 7:28 pm, in reply to "Happy happy, joy, joy.."

OK, how?

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Re: Happy happy, joy, joy..

Posted by Brickboy on March 9, 2025, 7:47 pm, in reply to "Re: Happy happy, joy, joy.."

Turns out ATDs do stick under load but once cleaned up and oiled if you kick the engine over there's a point where the load is reduced and it pings back to retarded. It is common to find they refuse to return when stationary - I never knew that.

Chatted to a mag expert and saved myself a lot of hassle and cash! It was properly stuck and I reckon I've unleashed double the power!

Re: Happy happy, joy, joy..

Posted by geoff the bonnie on March 9, 2025, 10:06 pm, in reply to "Re: Happy happy, joy, joy.."

Double the power is scary, i would loved to have that when i rode a Honda 50

Re: Happy happy, joy, joy..

Posted by ChazzyB on March 10, 2025, 10:44 am, in reply to "Re: Happy happy, joy, joy.."

Double not a lot still isn't a lot. I can confirm riding my own AJS fully retarded is very slow. A least I have a manual A/R lever.

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Re: Happy happy, joy, joy..

Posted by Will on March 9, 2025, 11:37 pm, in reply to "Re: Happy happy, joy, joy.."

I had anticipated your cure involved either WD40 or Thor King of Hammers. I was almost right!

Re: Happy happy, joy, joy..

Posted by Brickboy on March 10, 2025, 8:13 am, in reply to "Re: Happy happy, joy, joy.."

There was a third, match-based, option too!

I was really thinking it would have to be that £324 replacement but someone in the club put me onto Priory Magnetos whose owner let me into the secret about how apparently stuck ATDs will move if they are turned by the engine. I don't recall any issues with them on my two BSA A50s which are the only other ATD units I've had experience of - usually I have manual advance/retard levers. Mine was genuinely stuck but of course after rinsing it out with WD40, oiling it all up so that it worked in my hand and discovering the lateral movement, when I put it back on the bike and it appeared stuck I assumed it was just too knackered to work - but it isn't!

Once again, the value of an owners club is obvious. On that note the end of the BMRiders forum last year was such a huge loss to owners of BMW bikes of all older varieties. Very sad.

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