Question about 1981 Yamaha XJ 650
I have a yamaha pw50 it runs slow when cold & takes about half an hour to warm up & get up to speed. Does anyone know why it would run slow when cold? thanks
Posted by Anonymous on
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.
Posted on May 11, 2010
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Posted on Jan 02, 2017
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