davig3220 Posted June 13, 2016 Report Share Posted June 13, 2016 Hi,New to this site done twin shock trials (badly) withTY175 but I recently bought a otter frame and wheels and a set of C15F cases and crank with alpha big end got a set of wide ratio gears from a b40 wd which I believe will fit in.considering putting a big bore barrel ie.triumph 500 piston any other suggestions or comments,will fit electics world ignition. Quote Link to comment Share on other sites More sharing options...
totalshell Posted June 13, 2016 Report Share Posted June 13, 2016 keep it simple.. ask yourself one question.. will doing this or that mean i will put my foot down less? you can save a lot of time and money.. 3 Quote Link to comment Share on other sites More sharing options...
furse Posted June 13, 2016 Report Share Posted June 13, 2016 Are you mistaken by a 500 twin triumph piston? If so 1 of them is 250cc, used regularly in the bsa unit single. As above keep it simple, and speak to Charlie Prescott. It will save you a lot of time and money 3 Quote Link to comment Share on other sites More sharing options...
laird387 Posted June 13, 2016 Report Share Posted June 13, 2016 To find Charlie Prescott look on the bsa-otter.com site 1 Quote Link to comment Share on other sites More sharing options...
andy m Posted June 13, 2016 Report Share Posted June 13, 2016 Loads on Charlies site..... http://www.bsaotter.com/ 1 Quote Link to comment Share on other sites More sharing options...
japes1275 Posted June 13, 2016 Report Share Posted June 13, 2016 (edited) Mine has a Triumph piston in it I think, gives it about 270cc. It came from a guy who advertises on eBay with unit single rebuilds etc. Good service from him and the rebored barrel and piston worked out almost the same as buying a piston and having mine bored. I've got the Electrex World ignition, expensive and needs a bit of tweaking to fit but works well and is a neat solution if you don't need lights. Edited June 13, 2016 by japes1275 2 Quote Link to comment Share on other sites More sharing options...
davig3220 Posted June 15, 2016 Author Report Share Posted June 15, 2016 Hi,Thanks for all your suggestions.I do wasn't to keep it simple and CHEAP but I want to build and forget with reasonable and manageable performance so what cametc.long stroke or bigger bore. Quote Link to comment Share on other sites More sharing options...
laird387 Posted June 15, 2016 Report Share Posted June 15, 2016 One very interesting factor with the C15T came to light when discussing the performance with the Lampkins and Johnny Draper when they were first issued with their works bikes. They all agreed that they had found they got best results on hills by setting the throttle to give steady mid-range revs, then limiting the speed of the climb by leaning forwards or backwards to vary the amount of grip and keep the revs up by spinning the rear wheel slightly. They all agreed that if you throttled back to get grip the motor usually just died......... They were universal in agreeing that the works were far more interested in promoting the scrambles variants - because success on the tracks definitely sold more road bikes............. 1 Quote Link to comment Share on other sites More sharing options...
davetom Posted June 15, 2016 Report Share Posted June 15, 2016 (edited) I would keep it standard and see how you like it. I have a +40 Triumph 5TA unit piston in mine (70 mm I think), and it doesn't make a lot of difference to be honest. I always go for as low compression as I can, I usually skim a mil or two off the piston too. It depends on your skill level I suppose, but some pretty good riders ( not me !) find that that standard is enough. Edit to ad, I use Electrex too, works fine for me Edited June 15, 2016 by davetom 1 Quote Link to comment Share on other sites More sharing options...
davig3220 Posted June 29, 2016 Author Report Share Posted June 29, 2016 hi,i want to keep it simple and CHEAP but if you have to buy parts it must be cheaper to buy right part rather than fit later,i.e. cams, gears,sprockets etc.looked on otter sight very good.i like to put together and be happy and forget (never am) 1 Quote Link to comment Share on other sites More sharing options...
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