New here! What up!?

[Scootshark]

Hey guys, new here. Probably going to have a few questions along the way. Lets start with this one!

So I bought a used scooter off of a guy who let it sit for 6 years. It's a 150cc JMStar "Tank" with a 157QMJ. I have fixed and replaced a lot.
- new plug
- new coil
- new CDI
- new battery
- new fuel filter
- new gear oil
- new oil
- drained tank and filled with 93 (old gas was brown)
- checked belt (all good)
Got the scooter running and ran great, now it seems sluggish up hills and is basically topping at 40ish mph. Any ideas as to what could be going wrong? I even put the ild CDI in and runs the same. Any help would be great!

[Admin]

Welcome to the forum! Enjoy!

[Roscoe]

I'm also new to scooters, the last cycle I had was a Harley and that was 20 years ago. I also got a very used JMStar 2008 150cc but it seems to run good enough now, it keeps up with city traffic easily enough. I guess the scooter bug bit me. I had to clean the carburetor and adjust the valves on mine and a few other things. Check the "choke" or cold fuel enrichment and make sure it's shutting down like it should and the petcock also also the fuel filter, they clog up fast if the tank was rusty or dirty. Make sure the tank is venting properly for make up air. I'm 68 years old and I've hit 50mph on the scooter, at my age and the condition of the roads around here, that's fast enough for me on a scooter. My project now is to get the scooter to keep starting as winter comes and the temperature drops. Not that I intend to ride it when it's very cold but more to see how well this cold enrichment device works.

[kz1000st]

Look for a vacuum leak from a cracked hose. They dry out and leak on older China Specials. Also how many miles on it? Maybe it's time to check valve clearances.