The Compleat Yamaha TY80 Thread!!

Discussion in 'Trials' started by Brewtus, Apr 28, 2010.

  1. Brewtus

    Brewtus Buffoonery, Inc.

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    The acid test. Rode the 80 at SanYo yesterday. It would climb Dirt Hill! :clap

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    And of course go down it..:lol3

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    Bad thing is, it would not run above 1/2 throttle. It would just shut down. It actually stalled on the way back to the parking lot from Dirt Hill. To be honest, I was terrified that I had seized it already, although it had not detonated even once on the hill or on the trail. I rushed home from work today, pulled the cylinder head and....

    Nothing. It had not seized. :knary

    It had run very hot out at SanYo though. Hmmmm, could the exhaust pipe be as clogged as the exhaust port had been? I removed the pipe, and it was....heavy. Really heavy. Really, really heavy. "Good going, ya dork", I thought to meself. "Hot rod the engine and run it through a clogged pipe. Genius!" :bluduh

    Time to take care of that little problem! :evil

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    When the pipe got good and skin-melting hot, it smoked worse than a coal-burning locomotive. For a very long time in fact. Yeah, the pipe was full. I don't think I got it all, either. I can see this will be a week-long progress. If the neighbors don't call the Fire Department first... :huh


    More to come.... :D
  2. neilking

    neilking Been here awhile

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    Did you do a write up on the hydrolic clutch conversion?
  3. Lutz

    Lutz Killer Rabbit

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    :lol3
  4. Brewtus

    Brewtus Buffoonery, Inc.

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    I did not. It went on so easily, that I did not record it much beyond what was reported here. Or on "What I Did With My Trials Bike Today". One of 'em, I can't remember which.

    Day 2 of Smokin' the Pipe -

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    Notice the pipe burning cherry-red at the expansion chamber junction with the head pipe. It started burning like that halfway up the head pipe, and I kept it going with the oxygen until it reached the tail pipe. Really smoked today, and threw sparks occasionally! :evil I think we're clean.

    After the pipe cooled, I heard something rattling around inside the pipe. I finally worked the culprit out of the headpipe -

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    Oops! Whass' that??? :uhoh I shined a flashlight down the tailpipe, and it revealed a hole in the rearmost baffle in the chamber roughly the same shape as the slag. I guess it will be louder now. :lol3


    Bottom line, it is significantly lighter than it was before. It outweighed the spare pipe I had by quite a bit, but I did not weigh the pipe before I started. I did weigh it afterward, though. First off, the "calibration". The scale with no weight on it -

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    Hmm, 'bout a pound light. Now the Team pipe -

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    So that's what, 3lbs? Next up, the spare pipe -

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    Well then. Over 5lbs, and this was the "light" pipe of the two when I began. I regret not weighing the Team pipe before I started this nonsense Oh well....


    Coming up...paint the pipe, reinstall, test, tune, argue about the legality of the hydraulic clutch, buffoonery. In that order. Stay tuned! :deal
  5. Garthe

    Garthe ROCKS ARE YOUR FRIENDS...

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  6. Brewtus

    Brewtus Buffoonery, Inc.

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    Wow, time's running out. 2 weeks until the MWVTA opener in SanYo. Guess I'd better get busy on this pile. :lol3

    I removed the carb this morning, opened 'er up, and found....a bit of water in the bowl, and crud around the needle jet -

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    Hmm, maybe I should look at this carb more often than once every 5 years. :shog I checked the main jet size - 76. Yeeeah, a bit lean. I guess that when Lineaway jetted it for 10,000ft 7 years ago, the engine was already getting weak. I pulled out the carb for my personal TY since it was already cleaned and had a fresh gasket kit installed, checked the main jet - 84, much better since the OE jetting was 86. Installed the carb, and WOW!!!!! MUCH better!!!! :clap She runs very, VERY well now. :D

    MWVTA, here we come!!! :evil
  7. lineaway

    lineaway Long timer

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    Psst, Brewtus water is not a fuel source.
  8. Brewtus

    Brewtus Buffoonery, Inc.

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    Yeah, thanks. Got it. :bluduh :lol3
  9. Brewtus

    Brewtus Buffoonery, Inc.

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    Opening round of the 2014 Mountain West Vintage Trials Association season as told by The League -

    The weekend started off well. I dragged old OJ off the porch to act as a work mule this weekend -

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    Hmmm, I had not started, washed, nor even paid any attention to the old crock since Roswell last November. Some Haystack mud still clinged to the skidplate -

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    Loading up, rarin' to go!!!

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    Arrive, do some cleanup on the loop and sections, hang out with old friends, and...

    Campfire!!! :d

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    Got up Saturday morning to discover a flat tire on the Team bike. :huh

    I had noticed it the night before, and texted Hammer to save the day. He came through with a new tube, installed right before the horn sounded for Saturday's Trial. Not a good way to start the day -

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    Stupid cheap-assed Chen Shin tubes really ought to last more than 5 years anyway. I'm gonna fire off an angry e-mail.... :bluduh

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    The Team bike did get a new plate just for this season, courtesy of The Hammer -

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    The League. 'Nuff said! :evil

    Signup, with an old twist -

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    Yup, Hammer sportin' da dreads!! :lol3

    Day One. Some Carnage.


    We are not even to our first section when this happens to Yosemite's TY -

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    Yowza! A quickie fix, and we are on our way to our first section! Go get 'em!!!

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    Oh, this is gonna be a long day!!! :lol3



    Some random shots of day one -

    Boss Lady, who drew the short straw to ride with us Goofballs -

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    Yosemite -

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    Hammer -

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    Yours Truly -

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    Ah, young love between TY80's -

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    Hey baby! Remember when we did this on the way to Sturgis on our first TY80?

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    :lol3


    Day one ended with a killer feed put on by Old Geezer and his teenage bride :nono, with the storms moving in. Wind, rain, hail, sleet, locusts, plague, et al came in Saturday evening. After the worst part had moved on, it was an early night for the campfire kids.


    Sunday. More Carnage!!

    The wind had blown hard all night, but at least it rained too! :lol3 We're not afraid, it's time to go ride!!

    Oh wait, a flat on Yosemite's bike, and the pipe had come adrift on the Team TY!! :huh

    The Fred Flintstone tools did not work on the pipe -

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    So Yosemite Matt went back to camp for some slime and tools. I did not get a shot of Yosemite sliming the rear tire of his TY, but did get a shot of Hammer fixing the Team TY -

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    Gonna be a long day.... :huh :lol3

    We had an interloper join in on the TY festivities. JB Brown -

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    Hammer -

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    Yosemite -

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    Boss Lady -

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    Hey Yosemite! How well does that bike run again? -

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    :lol3


    We fought rain, hail, and snow all day long. This loomed on the horizon most of the day -

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    But we don't care, for we are...

    The League!!

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    :evil



    At the end of the day, I had a really bad get-off on the loop to section 8. Over the bars, bashed in the fuel tank, and broke a fin off of the new cylinder head -

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    :cry



    The nasty weather continued on the way home, but at least it was a tail wind!! :lol3

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    Battered, bruised, and scarred, The League will be back!

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    More to come... :evil
  10. GAwoody83

    GAwoody83 Been here awhile

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    How much fork oil do I use in this bike?
  11. Lutz

    Lutz Killer Rabbit

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    Good stuff! So, what's the final verdict on the TY engine freshening?
  12. Brewtus

    Brewtus Buffoonery, Inc.

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    Spec is 85cc's, we have been running 75cc's with Bel-Ray 30w fork oil and we still blow a couple of sets of seal per year. Specs here -

    http://ty80.weebly.com/ty80-specs.html



    Short answer is the engine is awesome! Pulls hard up hills and will do 3rd gear wheelies as far as you please. It's still runs rich right off idle even with the needle all the way down. I need to go to Yamaha and see if leaner needles are available, if not it will be time for some carb/timing tickleing. :D
  13. GAwoody83

    GAwoody83 Been here awhile

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    What air filter are you running? Not sure if there are any cheaper routes than a 20 dollar stock replacement.
  14. PSchrauber

    PSchrauber Been here awhile

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    To the blown fork seals you and the others in the pic's are in another weight class, with a Bultaco that wouldn't happen ;)

    To the carb I would look up smaller main and idle jets, the use of different needles will not satisfy you, you might switch to other diameter but then the idle jet has to be changed too.

    Another tipp try a colder plug
  15. Brewtus

    Brewtus Buffoonery, Inc.

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    The air filter we are running is the replacement one from B&J racing. I did however, modify the air inlet on the stock airbox -

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    That was done before the engine overhaul, in an effort to try to get the old girl running well enough to compete on. With the new top end, it really honks now! :lol3




    Bultaco?? Why would we want to compete on that? Those things are huge!! :lol3

    Trust me on this. Not my first rodeo. :evil
  16. Huzband

    Huzband Team Dirt

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    That doink in the windshield is going to migrate ya know.
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    Oh, big guys on a kids bike in sections? Priceless!!! :clap
  17. Qvarnis

    Qvarnis Adventurer

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    This brings back some memories:clap, my first bike was a TY80 Whitehawk. I will look for some photos of it.
  18. Brewtus

    Brewtus Buffoonery, Inc.

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    Please do! :thumb
  19. GAwoody83

    GAwoody83 Been here awhile

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    What is the shift pattern on these bikes? I have one that either has no first gear or its neutral on bottom
  20. Brewtus

    Brewtus Buffoonery, Inc.

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    Neutral is on the bottom. It's fine! :thumb