No, I do not run an inline filter, and I have not investigated inside the tank to see how effective the stock filter is. If I find any crud in the float bowl when I pull the carb, an inline filter will be the next mod I make!

 

My stock filter (let's call it a screen, like on my window to keep flies out) was a little wedge/sock at the carb fuel inflow line. I could imagine it passing jet-plugging particles. But it would keep out gravel. Installed one of those clear in-line filters that I got from a local dirt bike shop.

 

I run a similar inline filter on my 1972 BMW 75/5 because I am not confident that a 40 year old tank is completely free of corrosion which might flake off and contaminate the fuel.

 

To bring closure to my high rpm misfire, I had the carb off and found a small scrap of aluminum clogging the main jet. It appeared too large to have fit through the mesh filter in the tank. It looks like a piece from the casting or machining process. Odd that I didnt spot it when rejetting and it was never a problem until now. I am always quite careful to keep my work bench clean as I sometimes open up Swiss watches there too!

 

I originally posted the "hesitation blues" question last fall. Its seems the problem is not uncommon, but there are several possible causes, yours being unique. I was about to attempt re-wiring the r/r when other obligations came up. I'm glad you got your problem solved. Happy riding. BTW, I was in a Kaw dealer yesterday eyeing the KLR650, and it looked big and heavy next to the KLX. I'd rather have light and nimble.

 

@jdm243: the KLR 650 was my first choice too before I stumbled upon the KLX. Having wrestled the 250 through some pretty gnarly stuff, I agree that the KLR is bigger than ideal if you plan to go single track and beyond.