Triumph twin trials motorcycles

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Essential Website Cookies. Check to enable permanent hiding of message bar and refuse all cookies if you do not opt in. We need 2 cookies to store this setting. Otherwise you will be prompted again when opening a new browser window or new a tab. Other external services. In the Manx Classic Photo Lee Prescott.

Joe Owen. In or 5,. I along with the other guy's at North Bar Garage in Banbury, built up two Triumph Twin based bikes, one was a solo to be ridden by owners son. Dan Shorey, and the other a sidecar plot to join the Revolution that was at that time "Sidecar trials".

The sidecar fraternity were big into anything with the right power then, and the Triumph motor fitted the bill very well. Both bikes were built out of customers crashed bikes, well you could ride anything if you had a provisional licence then. Dan's bike got sold to George Greenland as a solo. ABW A was a nice machine, I loved it. George Greenland Photo. The sidecar plot was also good, we tried every which way with that machine.

I built the sidecar with any tube that was available, most of it from sawn up push-bike frames. I was into "Glass-fibre" in a big way by then, the new wonder material that you could build any shape from. And I was not wrong, just look at what the Carbon variety as done for the motor-sport industry and others now. We had Fun with that Groowwling Triumph.

And I wish I still owned that machine. But it looks like others are now doing the same and that makes me Happy. James Harland once again a Winner in Here is Rob's same machine, in the very wet, Saturday at the Manx Classic. Mark Stokes's Trifield. Martin's Cana dian built Triumph twin. Photo Martin Dervaise. I ride a Triumph twin in Canadian vintage trials, but since nobody else around here rides one, I have had to fumble through design mods and improvements myself, which in turn has usually meant doing it myself at next to no cost.

Also since our trials have fairly tight sections, the engine has to have really good low speed running performance. As far as the engine is concerned, I have found that using standard cams E inlet and rotating the inlet cam gear relative to the idler gear such that the valve opens around 30 deg BTDC I think it was 2 teeth, but easy to check , the low speed running and pick up was better, and it was less prone to stalling.

I left the exhaust valve timing as standard. Quick response from idle comes from an old Keihin carb with accelerator pump, it no longer coughs and stalls when quickly opening the throttle after a long descent. My electronic ignition system using an ignition box from a Yamaha twin and a pick up coil that I have made to fit where the contact breakers are normally mounted.

I use just a 12v battery without charging system since our trials are multiple laps and long distance rides are not an issue and this has left space for an external flywheel to be put on the end of the crankshaft where the alternator normally is.

This gives a marginal improvement in bottom end power and seems to give more grip in the mud. I made the frame myself and found that handling was very sensitive to the fork angle and trail. I probably cut the steering head off at least 5 times before getting it right.

Instead of buying expensive rear shocks I have found that for slow sections over rocks and trees it rides well with no damping, the weight of the bike probably provides sufficient damping effect. Worn out shocks are not collector's items so you should be able to get them fairly cheap. It probably wouldn't be so good for a flat out in third hill climb over rough ground but then unfortunately we don't have any sections like that. Hi, An historical image, Roy Peplow riding his unit-twin Triumph, one of only three models using the unit construction motors at the time.

They are riding in our trial championship in Leicestershire. Here is Pete Monk on his 50 ish cc trophy. This broke its frame a couple of trials ago and had to have major welding under the front of the engine area here is Roger Gagg on his on his CC.

With a generator engine fitted here is Micky Allen who occasionally rides in our events on his cc Triumph All these bikes look and sound great.

Great photos and great bikes too. Posted January 6, edited. Edited January 6, by laird Posted January 11, Hi, To add potential spice to the discussions, here is an image from my offroadarchive showing Tony Smith on his Triumph twin in the Yeo Vale's Crown Trial, where he claimed the Cup with a score of 32 lost. Posted January 13, Hi, Another of those Triumph twins from the offroadarchive, seen at the Old Codgers trial in is Roy Groves with his very interesting Wasp special - a very tidy looking bike that was going well.

Posted January 23, Posted January 24, Posted January 26, Hi, A couple of days ago 'metisse' asked whether I had any photographs of John Kendall, well, in the format of the TV chefs, here is one I took earlier!!

Great photo.. Should have both been at the Talmag today