Multi-use Tri­umph

Classic Dirtbike - - Dirttalk -

My Tri­umph started life as a bath­tub T100A from 1961, poly­chro­matic blue. I know the colour as I chipped a bit of paint off the other day and the orig­i­nal colour is still un­der there. I bought it in 1988 as I wanted to do a Pre-65 trial. Reg May had lent me his AJS to ride a cou­ple of tri­als but good as his Ajay was, as an ex-en­duro man, a 500 Tri­umph was the way to go for me.

Also, John May had one, we rode quite a lot to­gether – well, we rode in the same field. He looked good – me, not so much! Reg had the bike to sort out and it reap­peared with many mods such as a nar­row sub­frame, an oil tank un­der the petrol tank – frame is a swan neck, same as yours, where the petrol tank forms part of the struc­ture, Reg made an oil tank to do the same. There was a tucked in ex­haust with a si­lencer un­der the gear­box which meant run­ning oil pipes up and over the gear­box. Suzuki RL damp­ing rods re­placed orig­i­nals in­side Tri­umph forks, although I have now re­placed the forks with some later Bsa/tri­umph ones, much bet­ter as the wheel now goes the same way the han­dle­bars are point­ing.

Reg also put a chain roller over swing­ing arm so the chain pulls from there rather than com­press­ing sus­pen­sion and moved the footrests back. In­side the engine mods in­cluded chang­ing valve tim­ing to soften down T100, geared down on pri­mary by fash­ion­ing du­plex engine sprocket from Tri­umph cen­tre and Mini/land Rover tim­ing sprocket. He also al­tered the clutch lever­age so it is a two fin­ger op­er­a­tion.

I rode it in a Pre-65 for a few years, then picked up a 250 Bul­taco, model 91 and still have it. So the Tri­umph went out of use and I de­cided to turn it into a green­laner. I geared it back up a bit, big­ger seat, lights, elec­tronic ig­ni­tion, MX shock­ers, I’ve been im­prov­ing it ever since. Along with a mate, we re­built the engine last year, it was ac­tu­ally in good nick. In an­swer to some­thing you men­tioned in your ar­ti­cle, one part that didn’t need chang­ing was the tim­ing side main bear­ing bush. Colin Beasley Email Hmmm seems my Tri­umph is caus­ing in­ter­est, thanks for the ex­tra in­spi­ra­tion Colin, your bike looks good too and even bet­ter as it’s used. Tim

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