- Apr 11, 2010
Any lucky contributors here have a street legal Manx? If so I'd love to see it and tell us how you got around the "legalities"
I talked to Patrick Walker of Works Racing ( vg replica engines) about this last year. He said that a standard AMC box is fine, and he can supply an electric button decompressor for kick starting, and a small alternator for LED lights. Engine runs on modern semi or synthetic oil.Hi
Yes 1955 short stroke, back in 1971, biggest issue I had was vibrations at road legal speeds, no problems with getting past for roadworthy back then.
Fitted a Lucas alternator and dominator primary case.
Other issue was the standard Manx gearbox not much fun starting off on hills or starting and stopping in traffic.
I fitted a 99 gearbox with a kick starter to get around this, also used the kick starter, that was a lot better than pushing.
Fitted an Amal Concentric carby, on one trip to Easter Bathurst races the float bowl screws came out and the float went flying.
Since then I have restored the bike back to original spec.
If I was doing it again I would balance the engine so it was smoother at legal road speeds, and run total loss on electrical side.
Forgot oil leaks from valve push rods, spong was good for a short trip but longer trips not much fun.
I gotta dig out that issue to read more. The Price quoted was around £33,000. Engine and carb alone is £13K. No wonder they are rare!There is a thing called the Tonkin Tornado: https://www.motorcycleclassics.com/classic-british-motorcycles/street-legal-norton-manx
I was talking to Steve Tonkin a couple of years ago and he gets the motors from Molnar, possibly the complete bikes and then makes them road worthy, I seem to remember he said most went to Australia.There is a thing called the Tonkin Tornado: https://www.motorcycleclassics.com/classic-british-motorcycles/street-legal-norton-manx
I suspect it was fitted with detuneing mods, the same way Norton did to their Internationals. Softer cams and a plate between c/ cases and barrel to lower c. r. No way could you turn a standard Manx engine over compression by hand.Not me, but I do recall a mechanic of almost 45 years ago who regularly rode his Manx to work. It was great watching him start it up in the evening. Sat back on the rear stand He would put it in gear, rotate the wheel backwards to compression, then he’d spin the back wheel by hand to start it up. Never failed, started every time. Open megaphone, no lights. Wonderful.
Is that the same law that allows race bikes on the street occasionally?
No, there is a ‘daytime’ version of the MOT ( roadworthyness) test, so no lights are OK, but then only daytime use.
Road racing is not allowed on mainland Britain, hence the Isle of Man races, where it wasn’t banned way back when.
Lugs? What lugs? Didn't the centre stand bolt to the engine plates?We usually started the JAP and JAWA speedway bikes that way, c.r. between 14 and 16. So I can't see why it couldn't be done on a Manx.
A properly setup Manx c.r 10.5 starts with max. 4 strides run and bump. Only question is how he fitted the stand, Manx frames have no lugs for it.
No that's completely different, road closures allow races on otherwise open public roads, to ride a racer on open public roads without the need to have the roads closed you can get an Daytime MOT. The Daytime MOT allows you to ride on the open public roads only when the sun is up and visibility good, plus you have other requirements such as a working horn. The pre 65 trial bikes use it mainly, not much call for racing bikes with daytime MOT.Is that the same law that allows race bikes on the street occasionally?