Sectioned

Hi chaps, I've been told the later twin shock TYs have lighter engines than the A model. I have read a thread about the crank assembly being lighter but balanced out with a heavier flywheel weight. The spec sheets I've seen state that overall weight is the same for all the twin shock TYs (93kg) so would lead me to believe the engines are exactly the same weight. Anyone had them on the scales?

Reeds?

Is there a similar mod for the 250 engine that anyone knows of?

My coccyx hasn't hit anything for a few weeks ; ) May cut the rear loop off if it causes problems.

Haha kurtas I don't know what happened but if I click on them they are right way up. Guy53 I just measured mine and they are the same as yours, inch and quarter both ways. I'm 6'2 so maybe I could stand on the rear axle lugs bmx style ?

Made some crude footrest hangers and mounted by the usual method, drill and tap upper hole and welded a nut inside frame on bottom rather than a threaded rod right through. These are temporary to experiment with position before I commit to weld on mounts. Yes I've put them well back and that may attract some critisism but I am tall and heavy with chicken legs so if I lean forward the front end won't be light. Footrests are from an enduro bike.

Thanks for that. I will consider trials basics very shortly as I have only just got my bike set to go.

Haha kimpybugalugs, yes it's me and front brake is working well now. Cleaned carb, fitted inline filter, reset float level and its running fantastic. Pulls strong all the way through revs. Ty175 airbox fitted with a mutton cloth filter ? and my oe midbox minus baffle with 1" tailpipe.

Thanks guys. I suspected as much.

Hi again, what is the front brake like when new/properly set up? I have scuffed drum with emery cloth, chalked and removed high spots on shoes all afternoon, centred brake before tightening wheel spindle etc, adjusted cam lever, adjusted cable bottom and top. Will this bike ever nose wheelie or am I expecting too much? It doesn't really feel like it would stop me on a steep downhill. Frustrated. I probably need a new cable? Should it have the same stopping power as my mate's mid 80s mono ty250?

Aha well there is my current problem then. Thank you for clarifying that. Will have to experiment with the current setup before I charge in making new. Upon reflection, I can see why I got the initial response. First post past intro I'm asking for details of a well respected product seemingly so I can copy. I may have come across as trying piracy on for size but really that wasn't my intention at all. Just needed a few hints so I can work out my own version of exhaust. Been absorbing knowledge here for a while and fixed many things on my TY because of that but this was the first thing that came up where I couldn't find much on the subject.

I have cut and removed all the baffle in the mid box to make the thing lighter and larger. Haven't welded a stinger on that and no rear silencer either but the bike is super strong from idle lifting the front wheel easily in third on throttle without any other input. I like the pep of the lighter flywheel weight I think. Does run out at higher revs but may be leaning out due to no air filter/box.

Thanks feetupfun, you say its sensitive to back pressure so is that to say there is a fine line to get right or it prefers more back pressure over less? I just want a nice low down torquey bike with a reasonable spread of power. you know want my cake and eat it too. Have been working on weight reduction (as it's free) just to keep me tinkering. So maybe I'll copy (not exactly for the legal eagles) the OEM but out of alloy.

Wow! I guess I could always open up my original Yammy part and fab something similar from that but that might upset some sensitive types that I'm doing Yamaha out of business too. If I had a livelihood I would just buy one but I am a solo dad so alas money is thin on the ground. Maybe I'll just tape some old coke cans together so as not to infringe on anyone's copyrights. Sorry I asked. I sure will be reluctant to ask anything in the future.

Hi all, have searched but no joy. Has anyone opened up a wes or sammy mid box and taken pics or measurements? I would quite like to fabricate something similar as I cant afford to buy fancy parts and also enjoy that sort of thing. Or some good info on what exhaust characteristics the ty250 ts enjoys. Have the '74 model but may change barrel and head to the c or d as I've read they had better porting etc. Thanks.

Hello fellow forum goers. Been looking and learning here for some time and what a great site it is, so thanks to everyone for sharing their knowledge and experience. I am new to trials and have yet to ride in one, but the time is drawing near as the TY250A that's been languishing in the shed is nearly ready for action. It's a roughy but will be a work in (modification) progress. Sorry I don't have a photo on my computer to post right now. It is good to be part of the trials central community at last.