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It has a two-stroke engine similar to newer models made by Homelite. The recommended fuel mixture is a 50-to-1 ratio of unleaded gasoline and two-cycle ...
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
hi buddy for the engine you use silkolene comp 2 premix and you mix it with a mixture bottle buy off ebay with a ratio off 40:1 or it goes into a bottle on the bike and for gearbox use light gear oil use 350mls hope this helped
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