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Cynic

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Cynic last won the day on January 15

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About Cynic

  • Birthday 02/10/1971

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  • Current Bike(s)
    Yamaha Dt175mx (81) owned 32yrs TDR250 (88) CB175T (71) 1200Vmax (98)

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    Male
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    Middle of middle England
  • Interests
    Anything mechanical, from static steam engines to Rc helicopters......

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  1. I would think your looking at the wrong end, the heads will fit, with a reed block that size the transfer ports will be bigger. You can see that from the change in barrel mounting bolts as the old ones, (that strip) have been deleted. You need to see what is happening at the bottom, a base gasket would help. Deck height and such is prob the same. Piston crown and combustion chamber may be different. One of those things you just have to try but very likely will fit, i would get the matching piston and head tho.
  2. Cynic

    Dakar 2022

    I have watched some of this in the past, great racing, was it on terrestrial tv or will it be highlights in a week or so, like wsb.
  3. I think age has made the fluid spongy and that will increase the amount the fluid compresses which will in tern reduce the amount the clutch moves. That means more lever effort and lest movement within the clutch pack promoting clutch drag. My first step would be new fluid and maybe treat it to a braided hose.
  4. Going on this image from fowlers its somewhere behind the headlight. Yamaha SRX400 (1JL0, 1985) 010 B 1985 ELECTRICAL 2 supplied next day (UK only) by Fowlers Parts
  5. As far as the carb goes, those nasty Chinese copies (thats what they are) may work but are far more likely to cause endless headaches. Considering nothing drastic actually wears out in a carb, unless its physically damaged rebuilding is the answer.
  6. Yep. Just one of those things that disappeared in history. I used to maintain a generator when I was younger. Old 3 cyl raf thing used for shows and carnivals on an estate. That had de compressors on each cyl. You closed them in sequence as the cylinders warmed up. Do it wrong and she would stall, then you had to try and start it half warm. Not good. The clockwork starter was also an art. Got a good sweat on winding it up even in the winter.
  7. What you have is fine, i use the same thing. Just accept the bit of side bleed as a means to get the lines/system full of fluid. Then do the last little bit the old fashioned way. Don't forget your pulling vacuum at the bleed nipple so no air actually gets into the system its just going in the threads then out. Not up into the pipework.
  8. Decompressors can control engine braking on a decent to stop wheels locking, or a stall. As well as making an engine very docile. The twin plugs on small bikes comes from having 2 plugs in the head, they typically have different heat ratings so the engine can be used without switching plugs all the time. Some competitive vehicles have 2 plugs for reliability, my land rover i used to compete with had external condensers, (2 off) and 2 ignition coils (coils would fail often in off road overheating covered in shite)and associated wiring. Quick swap of the king lead and i would be running again.
  9. All the signs of a bad battery, possibly a dead cell so it has voltage but as soon as it comes under load, nothing.
  10. Have you checked for floaters in the fuel. They can randomly block pathways in the carb and then clear. Causing your symptoms.
  11. After 30 years... My worry will be the crank seals, costly to sort too if a rebuild on the crank is needed. Personally after 30 years, if the bike is good i would pull the motor and tear it down, the chances of it being reliable are slim at best and the cost of repairing after a massive mechanical failure on 2 strokes can be quite a surprise. At the moment its all good, set of seals and gaskets plus peace of mind when you ride it. Cheapest option by a long way.
  12. Standard questions. Colour of the plug. Bright blue spark at the plug. Is the plug wet after repeated kicking.
  13. Cynic

    Wr 125x

    Nah. Not the earth my money is battery failed internally or something close to it. Start at the battery at the very least. Losing all of the circuits which have various feeds and numerous earth paths (which the engine needs to run) says battery fault or a broken terminal/connection very close to it. The engine generates its own juice. If it was a honda you would be walking.
  14. It stings the wallet sometimes but if a part has to be right, the next best thing to ordering from yamaha is fowlers of Bristol. A lot of their parts for older bikes is bulk bought end of line manufacturer stuff they keep in various warehouses. Won't always be the cheapest but if its a specific part, (their website parts diagrams are ace) and you want it right. People on the phone are really helpful and have good knowlege too, not the "computer says no" types.
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