Free yamaha service manuals

SOURCE: yamaha tw200 service manual

here's one from ADV rider:

http://www.advrider.com/forums/showthread.php?t=325164

and ads somewhere:

http://www.tradebit.com/filedetail.php/6421300-yamaha-01-09-trailway-tw200-service-manual-pdf

SOURCE: I have a 2002 Yamaha YZ250. While riding the bike

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.