Three Not Of A Kind
Classic Dirt Bike|Autumn 2019
Three Not Of A Kind
There has been at least some progress in the workshop with our collection of machinery.
Tim Britton

Jerry’s Jumbo

Jerry’s rolled up his sleeves and is pushing on to reach rolling frame stage with the SWM and so far he’s more than pleased with the results. Over the last few weeks, as I have continued with the SWM restoration, my mood has swung from cripes what-have-I-done when I find yet another problem, to ridiculous optimism when I work out how to solve it.

Of most concern was the holed primary chain case and the fact that it was a thin casting was bad enough, but it being made of magnesium only made matters worse. I thought it was scrap but J&S Engineering of Colwyn Bay obviously thought differently. I sent them pictures and expected them to tell me the bad news, but no. They said send it up and they would sort it out and they did! Their chap is obviously a magician – just a couple of coats of paint and it looks great.

My initial wants list has grown slightly as I have realised the front mudguard stays and the handlebars are wrong. Otherwise I’ve been lucky as considering the machine had been in bits for 20 years, very little had been lost.

With part two of the wants list compiled, getting the SWM down to bare frame ready for colour proved to be laughably easy. First though, I test fitted a good second-hand bash plate and gave it a few tweaks for the perfect fit. This is best done before the frame is restored rather than repeatedly offering it up to a beautifully finished frame. That completed, I made a new rear mudguard mounting boss to replace a damaged one and sent the frame off to have it welded in, also asking the welder to layer some braze into scars where somebody had been heavy handed with a grinder while removing the brake lever bolt.

Having the frame repaired and ready for refinishing was a massive turning point and a huge psychological boost, but now the re-build proper starts.

In charge of the frame finishing were CJ Powder Coatings of Grimsby and fortunately shoddy paint stripping on the fork yokes had left enough of the original colour for them to make a good match. They chemically stripped the entire frame in a hot tank, gave it the lightest blast and then re-coated it, first in primer, then in the correct glorious metallic blue finish and finally with lacquer. Comparing it with my colour match parts afterwards showed the colour to be spot on too. They really seem to go the extra mile on this sort of job, it looks amazing and the lustrous candy finish really sparkles in the sunlight.

With the frame in the correct colour every part that goes back on now is there for keeps. This is a restoration but there will be one obvious deviation from standard, as the fork yokes will be polished alloy rather than painted blue – my apologies to the purists but I couldn’t deal with them in frame colour... far too 1980s for me.

An hour on the polishing machine has freshened up the yokes leaving them gleaming and I figure that should any future owner want to paint them it wouldn’t be a big task. The steering head bearings proved to be nasty but at £30 for a new pair it was not a bank-breaker to swap them out. Aside from that the front end rebuild has been a dream – when stripped to be cleaned internally, the hard chrome fork legs proved to be in perfect condition and the damper components inside were clean and undamaged.

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Autumn 2019