What is wrong NOW?! Yamaha XS650 Bobber, Tuning problem?

M

Mitch

New member
When I give the throttle a quick twist my bike stalls - I quickly let off and it returns to normal idle. So, I very gradually increase the throttle, but it still sounds rough, with a little popping from the right exhaust.

I own a Yamaha XS650 that is now a 750. I'm learning how to work on it myself, but I must research every time there is a new problem.

The most recent problem was a lean condition, demonstrated by the bikes crackling noises and loss of power around 5k rpm, the high idle after warming up, and the appearance of the spark plugs. I discovered that there was fluid in both of the bowl floats and replaced them with new ones, ensuring that the tabs were bent identically to the old ones (albeit, I eyeballed it). I believe bad floats would also explain the overflowing of my vacuum petcocks. Anyway, the day after installing the new parts I gassed it up and didn't even make it out of my parking spot.

How do I fix this?
If my floats are the problem, then can I take them out and bring them to someone who can put adjust them to spec?
 
You need to pull the carbs, turn them upside down and use a caliper or float height tool to set the height. Or, take the carb bodies to a shop and let them set them to spec.

Your repair manual should give you the height and the exact proceedure for setting the floats. You can buy a small ruler at home improvement stores in the tool department that lists inches on one side and mm. on the other side with a sliding clip. You can use it for setting the float height yourself according to the procedure outlined in your manual
 
you eyeballed the float hight,the new ones usually come with the GAUGE! Or you can buy the gauge its cheap. Get a float hight gauge get the spec from your shop manual and set them proper.
 
sounds float like to me use A real float level,or bring in to A shop,don't give up so quick though ,you said your learning ,thats how I did trial and error,be glad you have the www net ,dont forget about "jets", exaust and air flow(filter) balance too,and syncing carbs is A bitch
 
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