Question about 1989 Yamaha YX 600 Radian

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Cleaned carbs on 1989 Radian 600, now idles at 6-8K RPM. Please help.

We just cleaned the carbs and when the bike started, it idles to high.. between 6,000 and 8,000 RPM's.

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  • Expert
  • 58 Answers

Ok have you adjusted the throttle cable, i had a simular problem with my DTR125 track bike and it what had happened is the cable had become a little rusted inside the throttle and had stuck, i replaced it and everything was fine after that, disconnect everything from the carb cable wise and make sure everything is in the correct position then start the bike and throttle it manually on the carb and see if it revs up high and adjust accordingly until it settles to about 800 - 1k. 6k - 8k is extremely high for idle.

Also because the carb has been apart you have to make sure everything taken off goes back on in the right order and within the correct tollerances.

Posted on May 08, 2014

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  • Yamaha Master
  • 954 Answers

Please check the following:
- Throttle control cable adjustment.
- Foreign matter in throttle plate.
- Fuel line clogged.
- Water contamination in fuel.
- Vacuum leaks in the intake manifold or at the carburetor.
- Carburetor base gasket or seal.
- Air/ fuel mixture adjustment.
- PCV valve.
- Valve clearance.

Posted on May 08, 2014

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Posted on Jan 02, 2017

SOURCE: My FZR 600 is acting up and backfires

I have had several bikes in my time. and keeping the carbs syncranized is very important. Did you put aftermarket pipes on it? try rejeting the carbs up 2+mm that may help the fuel air ratio?

Posted on Feb 01, 2009

SOURCE: 2003 WR250 F - eng. won't idle down and carb starts to overflow

Hi Jwelden,
Have you checked the float level in the float chamber?
I guess you may have to reset the float pin adjustment, its allowing more gas to pass through thn required and thus the overflow!
Not bad too, when you are working on the float assembly take the opportunity to blow out the fuel line from petcock to the carburator via the seat for the float pin,any foreign particals there would stop the float pin to seal up and thus overflow.
Fit in an inline fuel filter , this will help keep out the dirt or whatever.
Hope this helps.

Knight (Yamaha Seca XJ750A 1981)


Posted on Feb 13, 2009

  • 9 Answers

SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Posted on Mar 12, 2009

cape cod bob
  • 292 Answers

SOURCE: bike runs at Idle but dies when given gas

have you changed the fuel filter? you are not getting enough gas, are jets squeaky clean? there is a good fuel system cleaner in the USA called Berrymans B12. put some in the tank warm up bike then let it stand overnight and see what happens. if still no luck repeat process. if you still have same problem then get new fuel filter

good luck

Posted on Apr 02, 2009

cape cod bob
  • 292 Answers

SOURCE: carbs were removed and cleaned. now starts hard and does not idle

sounds like carbs not cleaned right, oh try changing fuel filter, does fuel pump run constantly. if you cant hear it you can feel it, up behind the ignition. Berrymans B12 fuel additive works wonders. double dose add to gas run bike til hot then let stand overnight, pray a lot and try it again.
here is a free pdf service manual too http://www.carlsalter.com/aaman/Yamaha_VSTAR_650_MAIN_MAN.pdf

http://www.custom-choppers-guide.com/xvs650-bobber-build.html

thats mine

Posted on Apr 04, 2009

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