Battery charged enough? Alternator o.k.?
Bad idling should mean bad carburation -> is there a manual setting for the carburators? Look at the colour of the spark plug, inside the engine. Black=too rich engine. Mediumbrown=good. Light brown=too poor (in fuel) the mix. Oh, you should start with the idling screw, so the idling is a bit faster at first. Is the fuel flowing freely? fuel filters o.k.? Air filter too?
SOURCE: yamaha ybr 125 top speed
Hi les
Not much to start with here unfortunatly mate. A free flow muffler will help top end speed, change the factory airbox to a K&N style pod air filter, other than that, hugging the tank at top speed :) If you do change these parts, you may also need to increase the main jet size to richen up the mixture for better tuning of the motor with the better flowing parts. This bike has a top speed of 100kmp and produces 10 hp, so you may only expect to get at best less than 1 extra neddy, and perhaps another 5 km/hr.... I suggest upgrading to a bigger machine of you feel the need for speed :)
If its 125's you are into, test drive a Honda CBR 125R 6 speed fuel injected 13.4 horsepower, and good for 120km/hr
regards
robotek
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