Search found 488 matches

by FM350
Thu Aug 30, 2012 4:39 pm
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

Hi I have just purchased a 1984 ty250 trials bike as a project then to enter in clubman. I am looking to do some improvements and was wondering about what sort of improvements are doable to improve the bike. I have heard about moving foot pegs, increasing rear shock length, some throttle mods to ch...
by FM350
Thu Aug 30, 2012 4:01 am
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

OKO Aus should be able to help with a TY carb kit, with remote pilot adjuster and air intake hose adapter. Moving the footrests is a good idea, and I would suggest steepening the head angle by 2 degrees at the same time.
by FM350
Wed Aug 29, 2012 9:22 pm
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

Like it or not if you try making a very tight turn on a slippery surface, or want more precise control in more difficult conditions, the increased front wheel grip provided by more modern machine lay out, will work far better than the older style bike set up, which was designed to work with rear tyr...
by FM350
Wed Aug 29, 2012 7:12 pm
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

FM350, have you ever ridden a trials bike in a trials section? I have been riding since the early 70s, and always find first hand experience counts for quite a lot. On very easy sections though I wouldnt expect old style weight distribution, and steering geometry are going to make much difference t...
by FM350
Wed Aug 29, 2012 5:14 pm
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

Good lord. I do not want to start a war but for the second time this friday I attended a class on how to ride a TS and the first point was the riding position to make sure NOT to load the fornt wheel. I certanely won't go to a trial with section made by you FM. Guy Try riding a tight and very slipp...
by FM350
Wed Aug 29, 2012 5:07 pm
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

I just did some calcs using that table that FM350 provided a link for. I'm guessing that FM350 is looking at the unladen weight balance in that table for his theory about front end loading but bikes are not able to ride themselves so I worked out the load on the front wheel with a 180 pound rider a...
by FM350
Wed Aug 29, 2012 7:29 am
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

Things have moved on a great deal since the 80's, and the main reason for altering an old style bike to have more weight on the front is to provide more front end grip (and much improved steering), and this is now feasible due to modern rear tyres which grip far better than those available back in t...
by FM350
Tue Aug 28, 2012 11:41 pm
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

The purpose of steepening the steering angle, is to reduce the distance from the front wheel spindle to the crankshaft centre line, thereby altering the front/rear weight distribution putting more weight on the front. Fitting longer rear shocks wont help with this, and in some cases longer shocks wi...
by FM350
Tue Aug 28, 2012 8:11 pm
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

You will need to modify the Tri-Z piston slightly to fit. Steering angle steeper by 2.5 degrees will improve handling, and rebuilding the rear shock will make for much better suspension performance.
by FM350
Tue Aug 28, 2012 6:51 am
Forum: Technical help
Topic: ty 250 improvements
Replies: 39
Views: 16163

Re: ty 250 improvements

Lowering the rests is a good idea, as is a 28mm OKO or Keihin carb. Best piston to use is Wiseco intended for the Yamaha Tri-Z 3 wheeler. Stock exhaust is very poor, but its not that difficult to modify to work much better, and use a modified MX back box.

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