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Wow 55 mph... What is you tach saying at that speed? I have nearly the same mods and hitting 43 mph is about it at 8000 rpm. I have 8 g rollers to keep the top end.

I have them in two scooters and ended up putting 2oz in each 10 tire. For sure a big differance.
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Another update: while cleaning up the tools I found the two air box pieces I took out; one was inside at the the tube before going into the intake tube and the other was the cap with holes in it on the end of the tube going to the air box.

So far so good... I think now it is time to swap 1/2 the weights and get the RPM down closure to 6k... even at full on throttle it hovers at 7000-7100. The wife and I are on even bikes now. Although she weighs in at 160 to my 185 she most likely will win out anyway.

Will test and report results... I have a yellow contra spring with yellow clutch springs but I am not sure what that would yield other than take off at a higher rpm due to the strength of the springs. I also looked up the variator Alleyoop suggested and may order that too but I want to get the new carb on first and get that dialed in.

Great info, read it many times around different forums and trying follow that path already. The first thing was to unchoke this carb a bit as I felt it was restricted more than the standard known practices. Checked them all, drill out the screws and cap, no clip to adjust (will need washers) have washer and o-ring on the fuel/air needle. Slide moves all the way up. The backround is this we have two scoots of the same model bought 3 weeks apart from the same place. Her's runs at 7000 good take off and climbs the hills great and can get to 40 to 43 mph if needed. Mine runs at 5500 and goes up hill at about 25 while she is way ahead by now. If I get to 38 39 mph I am wearing lighter clothing that day...

Somewhere there is a differance between the two, I just cannot fiqure it out. Her throttle is way more snappier. So the intent is really not so much to purposly increase the RPM but to get the same running bike as hers.

Ok so here is the current state: stock 18 mm carb with a 88 main and what we think is a 30 pilot which was in it from factory. It reads H30 on the side. Due the main being increased I adjusted the air/fuel to compensate for the change and then made the idle adjustment. On the stand it does seem to have a slight hesitation when increasing the throttle steadily so I took the cap off the air box where the air first comes in and that seemed to lessen the hesitation. After the re-adjustment it seems to be better, idle is at 1800 Running down the road you cannot feel it to any real noticable degree. I think the sluggishness is in the stock parts of the variator and clutch assembly. The chinese carb is coming off and a 20 mm from Scrappy is going without any unkown restriction that none of us may know about. Peace of mind for me I guess. Of course I will have to go through this again but it is worth the learning curve to get better at this.

The book says max torque at 5500 is 3.0 N.m.

Ok so I am going to put the wieghts back in since I have the carb in a good state at this point with what I have right now and see what happens. Will go to the auto parts store and pick up some small washers and see what that does. Raising the needle will richen the throttle at 3/4 to WOT. I do not have a jet kit, I picked the 88 as it seemed the one people use on stock carbs accross the forums. Not sure if the pilot jet should be changed or run a uni filter. I was trying to stay with stock stuff until it became necessary to change. Also changing one thing at time make life easier for trial and error adjusting.

One more thing...Alley you are well appreciated, just reading the straightbanging posts to help her was amazing. I hope she gets going good soon.

Thanks will post results later