Yamaha PW50 does not run clean after half throttle, how do fix

3 Related Answers

Anonymous

2050 Answers
Posted on Jan 06, 2010

SOURCE: i have a Yamaha PW50 which seems to be in good

First, see what you dont have.
You need good compression
Does it have a good fat blue spark at the plug.
Are you getting fuel to the spark plug.
Any bike that sits for half a year could have bad fuel, and the carburator should be cleaned, as it might be gummed up. Changing the fuel in the tank will also help.

Anonymous

149 Answers
Posted on Mar 16, 2010

SOURCE: i have a yamaha pw50, it runs slow when cold &

every mechanical equipment runs slow wen cold. check the plugs

Anonymous

267 Answers
Posted on May 11, 2010

SOURCE: 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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