Thanks for the replies everyone.

I have fully stripped and cleaned the carbs and they don't appear to have any wear that would be out of spec. I will be replacing seals, o rings, needle and seat, drain screw and air mixture screw. Will check all adjustment is in spec and reassemble.

One other ...

Thanks guys,

They do appear similar to my other Yamaha 600cc carbs.

Will have to learn how to upload images.

Hi, new here and looking for some advise. I have a 99 XTZ660 Australian version twin headlight and was wondering if there are is any variation in the carbs and carb parts, or compatibility between this model and earlier models, say back to the 1996 or earlier year model. Just finding that many ...