Yamaha

Hi All, I have been picking up useful information from the forum for years but this is my first post. I bought a rough looking bike on Ebay a few years ago knowing that there was a majesty under all the alterations and rust. I took the head of to check if the bike was a 250 or a 320, the bore measurement was 70mm so i assumed that it was a 250. On further investigation the left side crankcase was broken so i managed to find a new replacement on Ebay. Yesterday was the first time i have been able to put the old and new crankcases together, and i noticed the opening on the old case for the cylinder sleeve is larger than the new case. Am i right in thinking that th…

Hello My 74ty 250 starts fine and will run for 10 minutes or so ok then when the throttle is opened it stalls like getting no fuel. Carb out and cleaned several times. Today it seemed to recover for a few moments when I pressed the choke. Vent pipe is not blocked New points and condensers, new crank seal on that one side only, must do clutch side next. Whats left ,carb rubbers or gaskets, reeds Had anyone this issue before.

Very quick one, is the RD350 inlet mod the carb rubber as well as the reed block? If so does any material need to be taken out of the inlet. Thanks, new to all this

Guys, What is the standard break in proceedure for a new piston, rings, and a bore that has seen another piston? I honed after the first piston with a 280 grit ball hone, but after 3 hours- the rings are still not seated with about 50% contact right now. What oil and ratio should I use or should I re- hone the bore and try again? I have .012" ring gaps at the top of the bore right now. My oil was synthetic Amsoil at 30:1. There are several contact areas disbursed around the inside of the bore about 1" wide. What am I doing wrong or what would you change to get the rings to seat fully? Thanks in advance!

Took all the lights off- need a good way to cut off the power to the coil- The switches I have are both momentary two wire switches that mount on the handlebars. I think they are meant to ground out the pulses to the primary side of the high tension coil. What has worked for you? Details please!

At the risk of kicking this subject to death- If I put in a full liter of gearcase oil after draining it all out, the dipstick shows an overfull condition- even after running the bike for hours. The oil is about an inch above the top mark on the dipstick even with my modified drain plug which allows oil to level between both sides of the clutch wall. So I am wondering - this is probably soaking up horsepower that could be useful at the back wheel, engine responsiveness and easier engine starts if the clutch was not half immersed in oil. So to me- I've got conflicting information- the book and the marks on the case say to put in 1 liter, but the dipstick says that's…

Guys- I took off all the lights and fitted a set of Domino grips and throttle assembly on the bars- for those of you who have gone this route- what is a good replacement for the kill switch assembly? I don't want a lanyard situation as I don't think it's necessary for my riding style. Any ideas?

Was wondering how much oil and what wt oil should I use in the TY 80. Also does anyone know where to get factory manual also ?

Guys- I have most of the torque settings in a shop manual for a B model, but I don't have the torque setting for the 4 aluminum cylinder hold down female bolts. Anybody? these are soft aluminum with a hex shaped top (4 each) if that helps- Thanks in advance!

So, I very very stupidly managed to knacker a ty250 twin shock clutch basket. Basically trying to lock it up to take the nut off, snapped a finger off the basket. Kicking myself so much over this stupid mistake, and also as the fingers look almost new, with no noticeable ridges ..... Regret selling my compressor and rattle gun....... Anyway the bike is a Colin Appleyard special, so one of the last produced. We are looking for a basket for this model. I have got it in my head there are 3 variations of clutch used over the years for this bike.... Cannot find anything on ebay using `TY250 clutch` as the search that looks similar. ..>...... However, some photos of a D…

Does anyone out there have a TY250Z two stroke aluminum frame Yamaha trials bike? What do you think of it. Is the engine the same as the Yamaha 4 GG - AxC = 74x58 on the new Scorpa? Does anyone know why it was discontinued, or where it was available?

Hi there, i'm new to this forum malarky, so if I've posted this in the wrong place, I apologise now. I have bought my son a TY80 Whitehawk that needs a few bits and bobs done before we go out and learn gears on his first ride. I have been trying to locate a 250-20 front tyre, but no one seem to be selling them. Any ideas where I can get them from? Everything seems to be 19 inch, or 21. My searching for 20 inch throws up mountain bike tyres! Also, how do I date the bike? The engine number is 451-107284, but I cant find the frame number as yet. Its not stamped on the headstock, so hope to find it once I get the tank off? Cheers, Dan

Any answers/ suggestions are appreciated. I'm knee deep in a 1977 TY-250 build and I'm wondering ... Has anyone decided to remove the factory head and tail/stop light? The bike will never be road legal and I don't plan on taking it out at night so I'm thinking I remove the lighting coil from behind the flywheel and delete the other bulbs and harness. Any thoughts or tips?

J'ai sandblasté et peinturé mon cadre, maintenant l'assemblage commence. J'ai aussi affiché des factures pour votre info. I have sandblasted and painted my frame, now reassembly begins. I have also posted some receipts for your info.

Can anyone recommend a restoration company - preferably in Yorkshire - 1983 TY125 owned for 30 years - little use - but now want to put back on the road

Hi does anyone know where to get the progressive springs from. Also people's best upgrades for the 175 that they have done and it's worked well Any info greatly appreciated Neil

Hi everyone, I have the opportunity to purchase a very original full size Godden chrome framed Majesty in Australia I have been waiting a long time to get a Majesty 250 or 320 but the chances of finding one of those in Aus is nil so a good clean 200 might be my only choice. I have had many TY's in the past and find both the 250 and 175's have their virtues and their faults, although i'm 100kgs I can ride both competitively and we don't ride many hill climbs here in Aus so the little 175 is not to underpowered. Questions for the brains trust: was the 200 just a bored out 175 or did Shirty do any porting and jetting etc:? Is there any real changes in power between…

Both of my TY175 side covers are patched so I'm wondering what else might fit. I have not seen any TY specific ones on ebay.

Hi al Got a TY175 recently and nice looking bike. Starts OK but will only run for a few minutes then bogs down after riding for a few minutes. When you let the clutch out when pulling away, doesn't want to go, bogs down and have to give it a lot of revs, but then eventually it dies and won't start again then. Any ideas? I think carb related as repalced spark plug and air filter is clean. Many thanks!

Hi all can anyone tell me what these shocks are??