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Ok well we got the exhaust and variator restrictors out and are now able to reach 36 mph. Low end acceleration is much improved too.

I broke a screwdriver trying to pry the funnel out of the exhaust so I took it to a welder/ trailer hitch installer. I gave the mechanic a six pack of beer and in 3 minutes the exhaust was opened!

Top speed after the variator washer was removed was around 32mph and after the exhaust restrictor was removed it jumped to 36.

Thanks for the help everyone

Sweet!

That's good to hear that the bike is running correctly per Yamaha, but that still sucks not being able to go past 30.

Anyone know why they restrict them? Emissions? Taxes? Mechanical problems?

Has anyone had any concerns/ issues/ tips after they've de-restricted their bike? Overheating, running lean, belts, weights, wear etc?

Thanks again

Ok I adjusted the valves to .004" In and .005" Ex. Bike runs smoother. I had the owner ride it to make sure it felt the same. He's stoked and I'm glad everything worked out.

As far as pulling the valve cover out via the bottom of the scooter, the gas tank hung up things. What I did instead was pull all the vacuum hoses, ignition coil, and spark plug out of the way and eased the cover out the right side of the bike as best I could. I nicked the gasket on the underside of the valve cover a bit, but nothing too bad. Going in was a lot quicker and easier.

I still had to remove the plastic bottom skid plate/ floor cover so that I had room to work on the exhaust valves.

Thanks everyone for your help on this one.

I just adjusted the valves on my friends Fly Scooters Il Bello 150. I couldn't find any settings so I looked online. Eventually I came across something that said adjust to .004 (Didn't say inches or MM).

So, I dont know how or why, but I took that as .40MM (That converts to .016") and adjusted the valves to that. The bike started up great and ran just fine. I didn't hear any excessive tapping or else I would have been worried.

This morning though I was thinking about it and started looking into adjutsments. To my horror I see it should have been .004 INCHES.

So now, my question is should I go back and adjust them correct or will they tighten up? I've heard horror stories about tapping valves breaking, ruining engines etc. and I dont want that to happen to my friend. Those Il Bello style Chinese bikes are a pain to work on as the plastic body doesnt come off easily!

Please let me know what I should do ASAP as I'm leaving Monday for a work trip.

I only have four wires exiting the generator. Blue/ yellow, white, yellow, and green. It ran fine before with that. I colored a wiring diagram for it.

-Blue/ yellow wire goes to the CDI & Key switch
-White goes directly to the regulator/ rectifier
-Yellow goes to the regulator/ rectifier & headlight
- Green grounds out.

No red wire anywhere. This engine is a KDU style. I was told its a twist on a GY6 engine

Ok well thats re-assuring to hear. My Kymco is a KDU engine. The next step up from a GY6. Anyone know where I can get a cheap flywheel puller?