when riding in fifth gear and hold it open it worked fine sixth gear leisure speed to wide open it gets boggy. it did this for most of the ride but then it started to affect all the gears at differetn speeds untill it quit...has compression and good spark checked the fuel filter and it is clean...have no time to work on it untill this weekend so just wanted to see what you guys thought

 

Check jetting I guess, I find most problems are usually with carbs.