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Anonymous Posted on Apr 11, 2009

Does anyone know what sparkplug I should be using in a 1981 yamaha YZ250 dirtbike? Thanks.

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  • Expert 292 Answers
  • Posted on Apr 11, 2009
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Related Questions:

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How do you drain rain water out of the head of a yz250 dirtbike

If you mean water has got into the plug hole, then crank the engine over with the plug removed. The compression will force the water out. Keep out of the way or you will get covered.
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I have a yamaha pw50, it runs slow when cold &

Most likely a combination of sparkplug heat range (type of plug) and jetting, needle or air mixture settings in the carburetor. Assuming good condition of air filter and operation of the choke plunger. Are you using the correct octane fuel and fuel/oil ratio? Give the plug a clean and emery the spark contacts, set gap at 0.7mm., ideally take the plug to a Yammy dealer and check for correct range for your bike in the area where you ride.
Best to have a range of spare clean plugs handy for wet or hot days etc.
The jetting maybe dirty or wrong size too. In the meantime move the throttle needle clip down one notch. Refer to the site below for a diagram of the carburetor parts. Cheers.
http://www.cmsnl.com/yamaha-pw50r-2003_model11163/partslist/A-09.html
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How do you change the sparkplug?

I have a suzuki 2005 dirtbike 250 4 stroke I can't find my manual anyone have that i can download or do you know where the spark plug is? it won't start
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I have a 2002 Yamaha YZ250. While riding the bike engine died, could not start it since. Already changed sparkplug, cleaned carburator and airfilter. Does anyone have a solution or know where i can...

i think i can surely tell you that you need to replace your CDI.The CDI is an electronic system of your motorcycle to triger the sparkplug to burn the gasoline.but,due to it is an electronic device which composed of integrated circuit,there is a risk that this CDI will perform an unpredicted work becoz every electronic part have the risk of burning &malfunctioning when it heat.
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