Question about 1994 Yamaha XJ 600 Diversion S

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Problem when cold

My wife has a R Reg 600 Diversion, when the bike is started from cold it runs up OK but sounds as though it is running on three, the engine will not accelerate, it has a very bad flat spot, the engine will die if the throttle is twisted after starting, if you are riding the machine it holds back when you twist the throttle.

When it is warm this problem disappears, could it be plugs? the bike has been to a dealer but came back worse, they said the carbs were out of balance, don't think so or it would not disappear when hot.

any help would be great, don't want to pull it to bits if I don't have to and I dont want to give it back to a dealer to cost us fortunes, this is quite improtant to my wife as she has just passed her test and needs to get into the swing of it for the summer, but she is worried that the engine will cut out when she is turning right or doing U-turns etc.

Thanks

Posted by on

  • cofford Feb 27, 2009

    Thanks mate, will give it a go today, any idea how long it will take to work if it is a jet problem, the bike has been standing for quite a few years, I bought it last year and it only had 3,000 on the clock, so you can guess how long it has been garaged. I reckon you are right though.

    When she is running normally it goes not bad.



    Cheers mate



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  • 22 Answers

Sounds more like a problem with the carburetor's enrichment circuits (1 for each carb; linked by a shaft across the tops of the carbs). These carbs have a separate "well" in the float bowls that fill up via a very small jet pressed into the bottom of the bowls. A brass tube goes down into the "well" to syphon fuel. This circuit easily gets gummed up if not used too often. Try putting some Seafoam, Yamaha CARB-CLEA-N-ER or Techron in the fuel and see if this cleans things up.

Posted on Feb 26, 2009

  • dc-eakin Feb 27, 2009

    It might clear up in a matter of hours, or it may take longer. Best bet would be to remove the tank, drain the carbs, refill the carbs with a strong additive-gas mix (from an auxiliary tank), turn the engine over to get the mix into the carb internals, leave for a couple of hours, drain carbs, reconnect/install OEM tank and see.

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