Question about Motorcycles
Ive got a 1973 yamaha rt 360 new topend .50 over basseni pipe starts on first kick runs smooth for two minutes the surges wide open
Sounds like a fuel regulation problem. If a carburator is involved check it for the float valve being stuck. If fuel injected, check the pressure regulator. Also check for possible air leaks in tubes leading to the engine...an air leak will cause abrupt revving.
Posted on Jan 11, 2013
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Posted on Jan 02, 2017
SOURCE: throtle open wide
It has been 35 years since I worked on a 360 as a mechanic at Lynn's Yamaha in D.M. Iowa. You have one of the few left alive. Pull the air cleaner off and look at the slide in the throat of the carb. Does it move all the way up and down freely when you twist the throttle? Is there play at the top of the adjuster on top of the carb? I think your bike has an oil pump for the 2 stroke oil. Remove the front right cover plate, (I think it had a right casing cover separate from the pump cover), and look at the operation of the cable wire on the pump. Both the slide and the oil pump cables should have some free play.
Are there reeds on your carb? The reeds will be between the carb and the cylinder if you have them. Are any of the reeds cracked or broken? Are all reeds fully closing? What condition is the rubber between carb and manifold? Get back to me with the information and we can go from there.
Posted on Jun 14, 2009
hi m8,, first try this, take the handle bar start button switch gear appart,,and clean the starter button terminals that connect wen u push button in,,spray some wd40 inside the switch gear wen u put it back together,,,,,often after off roading ,,connections that the eye cant see corrode wen the bike is washed down,, any probs still ,, shout and il anserw m8,,,,,cheers
Posted on Jan 11, 2009
SOURCE: my 2002 yamaha ttr 225
well it is normal for a four strokes exhuast to turn red your not suppose to let them idle for long periods of time. and the running problem is probably the carb i would take it off and clean it before doing anything else could save you money i had the same problem on a yz450f i took the carb off and cleaned it and problem was solved and also run 93 octane gas if your not already
Posted on Mar 30, 2011
Have you been using 2 stroke oil in the oil tank? A lot of new riders haven't had this explained. A neighbour used engine oil and has now got to strip and refurbish the engine. A 2 stroke engine mixes oil with the petrol to lubricate the crank and con rod on the induction cycle. If you use engine oil, it carbonises in the engine due to the extremely high temperatures on the underside of the piston and aroud the bearing surfaces of the crank. It will run "ok" for a short while on this oil, but will eventually kill your engine. Also on 2 strokes the exhaust system needs regular cleaning to remove "coke" which is burnt oil in the form of a sludge. 2 strokes use exhaust tuning to improve performance and efficiency, so it may need a clean. This is the best advise I can offer with the information supplied, and also the most obvious. Just one other thing - when you turn the engine over do you get a spark? It could be the coil, if the rest is good. Sorry I can't be of more assistance, I hope this give you an idea of where to go from here.
Posted on Nov 23, 2011
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