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The engine has always lacked lower grunt. Best thing to do, is for the boy to start learning proper clutch control. Myself I would just leave the bike alone till you are ready for a 125. It`s always been a great starter bike. The new ones are supposed to have a new motor, interesting to see why.
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Hate to say on most OEM parts, you have to do it the old fashioned way. Pick up the phone, call a dealer and ask to talk to the parts dept. Actually it`s in your best interest. You might get the correct parts the first time.
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Maybe I should put a set on ebay.
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You are making this way too hard. Put it back together and ride it. If the clutch is slipping order new plates. Twenty minute job if you are slow. Just throw it down on it`s side no fluid needed. Also the springs will be fine. There is all kinds of specs on the Gassers because of all the problems.
PS if you check part #`s between the rev3 and Evo, I would bet there are the same. There engine really has not changed too much through the years.
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All above tips are good. I`ve had a few `tough` bikes through the years. Get the rear caliper above the master cylinder. ( hang it with straps or what ever. Just get it high.) Use a long clear line to bleed from caliper nipple. As stated pump without the pedal. If all else fails leave 24 hours to let the air bleed up.
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Spherical bearings usually require no maintenance other than replacement. Bolts could be removed and pivot points greased and bolts anti-seized.
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The `85 foot pegs mounts were weak. That was one of the improvements on the 1986. You might strengthen it if you put on large pegs. The TY handled well, just takes time to get used to the tall stance. There is really no room to drop the mounts. If you want it to work like a modern bike, take the weight off the flywheel. If you have a machinist friend it would be better to shave off half the weight, but it is fun to try it with out the weight!
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Chuck, the `84 250 vs `85 350 used the same crankcases. Do you really think Yamaha built a whole new bike just for the USA? Just a bigger cylinder and a few odds and ends. Most parts that started with 38v were interchangeable, the 46y were mainly 350 parts or later UK bikes.
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That was probably the answer spark arrestor model. Which has not been available for years.
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Did you try Rising Sun Imports? (The USA GASGAS parts importer) I cannot imagine Jim has no sprockets. I assume you are new to trials?
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I could have my insurance agent ask him this week. ( Since his daughter is riding the TDN) But maybe he has
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Only the cylinder and piston kit should be the only difference to the 350. Parts from the UK are not that hard to get. The TY mono was probably the best trials bike ever. But they were rode to death and Yamaha USA did not ever have much parts. Either buy a spare 350 or go modern would be my help for you. There has been quite a few almost new bikes on Ebay. The 1986 was a lot better ride, mainly the rear shock.
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Dan, I have always enjoyed your posts. Race gas is not a cure when jetting can fix the problem. Some trials bikes do benefit from a higher octane fuel, but I would jet it based on fuel that is widely available. Try the 35 pilot again.
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`For example, in my premix I only use full synthetic Belray H1R`
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First off the stock kill button/ light switch should just be changed to a kill button. That`s the first thing I do on any bike. Go back to the 35 it will help with the pinking. ( cleaning a carb and air box is the first thing you do on any used bike) I`d pull the water pump off and inspect the impeller. Once you know the cooling system is working , check the rest of the electronics. Used bikes require work first, then riding.
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Yeah, I did the manly thing and waited two months before going to the doctor. Two months of not doing much since I could not breath right. Twenty minutes of my doctor putting my ribs back in place and instantly I could breath again. Besides a bottle full of pain meds for the next crash that really hurts!
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No, the Beta`s always had a good pop just at idle. And more mas means slower response.
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Did you hit the ground funny? 2- 8 weeks.
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Actually your crank looks like the earlier rev3 models. The later ones had quite a bit of plastic. The 250 and 270 always had a good pop to the exhaust on a good running Beta. Have you messed with the timing?
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You are talking a 9 year span. Do you have a 2005 or older?
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That is a 2002 which is better. The rev3`s were great bikes. Will make a good starter bike. Looks good, except the skid plate has been pounded on and is that a nick on the right fork tube?
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Try,
RCS Racing
7204 Rt. 7
North Ferrisburgh, VT 05473
802-425-2081
They used to be the importer before, most knowledgeable on the old Betas.
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No go ride it for a half hour. If it still feels like its dragging burn it hard in fourth gear!
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That is why the `pro` transmission can be ordered complete.
MT280236010
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There is a small hole that feeds to the piston, sounds like it may be blocked. Maybe a small wire. I usually pull a wire from my wire brush.
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