David, I had a '' different similar problem '' I explain. When I took the cylinder of my B model to clean the ports I took the reed bloc off and check the petal ( original one ) they where not sitting thght, I check them, they where straight, so I turn my attention to the block, a thin layer of carbon had form close to where they are screwed to the bloc, a careful cleaning did the job for me.
I went in the shed with the caliper and the measuring tape this morning. The IRC mounted on the 1.85 rim is a little more than 1/4 inch narrower than the Michelin mounted on the 2.15, both tire at about 4.5 p.s.i.
Maybe the difference come from the tire themself . On the 1.85 rim I mounted a 400/18 TT IRC and on the 2.15 a 400/18 TT Michelin. I will take the old measuring tape and confirm .
I don't know about rules for those bike but I notice on my TY that there is a big difference between a tire mounted on a 1.85 rim than one mounted on a 2.15 rim so my question is
Can't you use a narrow rim to have more clearence ? Mick told me they tried very narrow rim back in the days with succes.
I think bestrcpilot comment is probably the one that is the most important, in it he mentioned '' flow bench '' now we are talking. Every time I make a change on my TY 250, WOW what an improvement !! But when I ride a stock one after a few hour on mine often I have to confess that my WOW was for the gallery.. A flow bench for the development and a dyno to confirm that it change the power band is the only way to go. And yes when you alter the intake, the carb as to be adjusted and you have to make sure your exhaust can take the increase flow.
Wheater is also a concern over here ( Quebec ) our first trial is suppose to be held on the 31st, but 30cm of snow fell in the last 2 days, so patience and hope is what's left for the moment,
I don't know about the 175 but on my 250 A or B I replace the head gasket ( very thick copper ) by a thin aluminium ( about .005 '' ) to increase the compression.
I do agree that it change the way the bike handle and I like the lower and back mod. The first setup I made was not in the right position for me so I made a second one that is at the right position http://s1065.beta.ph...907578292812924
I cut the lug, drilled and taped where the lug was, on an A model I decided to weld a threaded '' washer '' and voila home made bracket that is cheap enough to trow away if it's not to your liking.
I modified last year a TY TS ( raised the motor and inclined the shock ) . When I took it apart to stoire it I noticed that the chain now sometime drag on the swingarm, so I looked at some pictures of Majesty and they seem to have some sort of guizmo to prevent that. Does anybody have a pictrue of thing.
Thank's B40rt, I sure like to ride the Mono, but don't intend to use it in competition, there is no Aircooled Mono class in Quebec, and I not up to ride with the Modern guys.
After I finish the reassembly of the TS, and mount the IRC on the 215 rim and the on the 185, I will '' attack '' the Mono, I want to lower the pegs, rebuld the motor ( main bearing, sea,l new rod, rings ) and beleave it or not if needed a new 3rd o/s ''genuine'' Yamaha piston and rings set. I'm happy to know that both tire and rims and tires are '' mixable '' , the word around here was that I would not be able to set any of them on the 185 rim.
Since a starter is in the '' conversation '' one guy who come to some of our competitions in Quebec used a 125 ( I think ) 4 stroke Yam in a frame he made himself and it sure look like it's a good ride.
I have done the same putting the two rims together, as I wrote, I never tried a 185 rim. If you mounted the tire yourself, was the 185 harder to set the tire in, as I mentionned my plan is to mount one rim with a Michelin and the other with an IRC both 400/18 tube type to go on my modified 250 TS and another IRC on my Mono.
I asked this question a few years ago with no answer, but maybe this time I will get lucky. I bought a few basket case TY ( A, B anc C model ) with different rear rim width: 185 and 215. I ride the 215 rim with a Michelin X11 and bought an IRC tr11 as a spare, I would like your input on this : should I mount the IRC on the narrower rim or change the Michelin to the narrow rim, or is it a bad idea to mount a tire on the 185 rim?
I hope someone who tried this can give me is input
I burn mine : I put a little gas in and light up with a torch, once the fire is started, I leave a bit of oxigene whit a bit of air from the compressor and let burn. If the combustion is right, you can '' follow '' the the red patch all along the exhaust. I have to tell you that it's not the thing to do when a neighbor is out on the patio whith friends, it make a lot of smoke. Another way to do the job is to put the exhaust in a fire and let burn.
Good for you, I don't think you will be sorry mov to go ing to the 250, the 350, from what I heard is hard to '' jet '' properly in different wheater and altitude.For the brake plate, maybe this can help if you don't find a plate http://www.trialscentral.com/forums/topic/44335-ty-yz-brake-shoes/
:hyper:
Ty250 Twinshock Reed Petals Not Resting On Seats
in Yamaha
Posted
David, I had a '' different similar problem '' I explain. When I took the cylinder of my B model to clean the ports I took the reed bloc off and check the petal ( original one ) they where not sitting thght, I check them, they where straight, so I turn my attention to the block, a thin layer of carbon had form close to where they are screwed to the bloc, a careful cleaning did the job for me.
Guy