At the 50,000 mile mark I decided it was a good time to change the fuel filter. The scoot had been hesitating when "on it" in the higher gears. Of course I changed both fuel lines while having the guts out. I found manipulating the unit out was more difficult than getting it back in. Couple of noteworthy findings: It took effort to blow through the old fuel filter compared to none at all for the new one, guess it was pretty dirty. The check valve fuel line had a hole wore through it. Both of these I'm sure contributed to the sluggish performance, and after I put gas in it and took it out, It felt like a new bike. It was also hard to start before, taking several cranks, now it fires up as soon as you press the start button. A couple hour effort that was well worth it. Worse part of the job was draining the last bit of fuel (before removing the check valve).....are there any easy ways to do this using the cross over line without spilling any gas?