Yamaha

Hello all, I am a recent new member of this website and have been reading about the TY250 in particular since I bought a 1974 version in very sad condition. It was seized solid in the top end and sat for a few decades with the plug missing. It took every trick I knew to get the cylinder off and when l cleaned up the crankcase I found three or four of the stuffers had come free from the crank. I split the engine cases a few days ago to replace the mains and now I have a chance to replace those plugs. My question is, is it necessary to replace them? Can I use wine bottle corks with a few coats of varnish? Where do I even get these things? Does any of you even know what I’m …

Posting this here as i know i will want to refer to this again someday in the future. As im modifying my 175 with 350 mono stuff i needed to go up to a 520 chain but my counter shaft sprocket has been a PITA to get right... so here it goes. Dear future Biff, Hows it going? Wow yea i can see you haven't missed a meal. Well as you asked the counter shaft 520 sprocket from a 1980-1993 kx125 will work on the Ty175. Stay well bud! --Past Biff

I would appreciate some help as I am having trouble getting the clutch to disengage on a TY 250 I have just brought. I am on the final stages in completing the rebuild of my 1974 TY and upon splitting the crank to replace the Mains I have come across a really bodge repair of the gear change return pin in the RH crank case. Fortunately I won a Ebay purchase for a replacement engine which has already been rebuilt it runs well but the clutch will not disengage. I thought I found it when I realized that there was an additional clutch plate installed or that there was a washer missing behind the clutch basket but realize as this is a latter engine it did not have one. I mig…

Hi, first post, other than the introductory post in the other forum. I am in the process of getting my TY250 in good running order. In the process of checking the timing and the points gap, I notice that the points don't seem to open at all, no matter how they are adjusted. What am I missing? The bike starts on the first or second kick and runs fine up to half throttle. (I just installed a new carb and ditched the autolube pump, so I have some smoothing out to do. But I wanted to dial in the ignition before I go too far messing with jetting.) Mystified.

What do you guys think? Ever needed one on the trail? What kind of a problem did you have with the chain to begin with? I can't see even owning one for the shop much less taking it on the trail. Opinions/ experiences - please explain in detail.

Hi all. Has anyone fitted Boyesen reeds on their TY175? If so did it make much difference and what difference (bottom end, top end etc.)? Did you have to change anything else (jetting?)? I know guys with moto X bikes that reckon these are a must have. Cheers.

Guys- This is not really specific to the TY 250, but hopefully nobody will kick me off of here for asking a non- trials question? I started exploring the riding areas around here and realized very soon that I had no safety gear that would help anything if I (fill in the blank!) I went riding and the area was remote and getting remoter as each mile went by. But the road was just a bit boring for me and I took off on a path maybe 4 ft wide. It went on for miles and was slowly climbing the side of a 5000 foot mountain, so it got rockier and steeper as it progressed. I had gone thru several open gates and there was no one on this trail except yours trul…

l long time back I read on here that some guys were cutting away part of the left side chain cover to prevent the possibility of the chain getting jammed between the front sprocket and the cases. Has anyone done this mod to the TY 250 A and exactly where is the correct place to cut? Pics please if you can!

I need to order a socket to pull my front sprocket and can't seem to find what size the lock nut is... anyone know what size I need? Thanks!

Recently brought a ty 250 mono the silencer seems ok but can not find anything about them any where?

Ladies and Gents- has anyone recently bought a new rear sprocket for their TY250A - I mostly ride fire roads - bike is still not set up for trials- The sprockets and chain are all worn out-I can start over with either 428 or 520 chain but durability is important to me- I'll be miles and miles from the truck if something goes wrong. But getting back to the question- who is a good supplier in the USA? And part numbers if you have them please!

I have what I believe is a Majesty frame but wondered if anyone could verify the format to confirm what it is. The number is 81 11 01 B. The frame appears to have originally been painted yellow. I am assuming it’s a Godden version. Any help appreciated

Does anyone know which model and years of the 250 had the speedo on the left fork leg? I think it looks cool and my bike didn’t come with it but it has the drive with a plastic blank where the cable goes. It looks like some 1974 models did have it judging by photos. If I ever get my engine finished I’d like to have that feature

Probably well covered elsewhere but any quick recommendations for what tyres (tubed) I should put on my 1976 TY175 without breaking the bank? It’s got MT43s which are in good condition but quite hard (so I guess a bit old - on before I bought it) and have zero grip in anything slippery. I don’t want to spend too much as only ride it once a month up/down the drive and then maybe two or three times a year in easy comps. Thanks for any advice.

Hi all I am having trouble removing flywheel on 1974 TY250 , using the correct pullers time and patients but no budge. Any recommendations

New to me 74 TY 250 as of yesterday. Can anyone recommend the proper frame paint for this beauty? TIA

Does anyone know where I could get the speedo repaired/refurbished? Mine has a broken glass and only operates spasmodically!

Can somebody with an original TY 250 A tell me what the stock length of the dipstick is? I'm getting 133 mm for just the metal rod below the plastic handle???? The part number on CMSNL is 3221536300, but on there it looks like a plastic one. - I want to make sure I have the right quantity of gearbox oil in there. Thanks for your help!

Here we go again? What are your thoughts about mounting a tubeless Dunlop 803GP T tire on the rear (tube type) (twinshock DID rim??) When I ordered it- the web page said it was "tube type" but when it arrived, the words "tubeless" were moulded into the sidewall rubber. Here is the link to the website: https://www.chapmoto.com/dunlop-d803gp-trials-rear-tire.html I have not tried to mount it yet, and I'm still well within the 30 day returns limit from the vendor. I have a 21" 803GPF mounted on the front and it says "tube type" and I had no problems with it- it has a tube in it and works just fine. Did Dunlop stop making the 803 series rear …

Questions, angle grinder for port modifications. -I have modified several 2 stroke cylinders with Dremels with decent results, but never upper transfers because I don't have a small enough angle grinder. -I have a trials motorcycle engine TY250 Mono with 68 mm bore that I would like to work on the upper transfers. My 90 degree 1/4 inch angle grinder is too big. -I can't afford a Foredom cable operated with the assorted heads. -If I have to buy something, I'd like to be able to do saw cylinders as small as the 026 44 mm bore. -What is out there that could do a 44 mm bore? I can do electric or air. The low speed dental heads are cheap, but t…