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Since this post, I've...

1) Upjetted the carb to an # jet and TRIED to put on a UNI air filter. Apparently, it wouldn't take the filter. Looks like I'll have to get a # or # jet before it'll take.

2) Installed a new variator and put 9/5g weights in it (for 7g). A little lag on takeoff, but after that....

3) Installed the "orange" performance coil. Noticeable difference (runs better than when I got it)! As for the "orange" CDI box...I kept the old blue one instead, because I crack 40 regularly on the straights with it. The orange one halted me to 35mph.

4) Had to replace the clutch assembly, tried to upgrade the springs in the new one to the 2K red. Gotta get a bigger impact socket (either 38 or 40mm) before I can finish the job, as the nut holding the spring down is THAT huge!.

5) Had to delay installation of the BBK and tranny gears due to harsh time constraints. Might have to take it to a shop to get 'er done for time's sake.

6) Drilled holes around the exhaust tip.

7) Rear tire went out, so it was replaced with an Innova 3.00-10.

8) Installed cigarette lighter socket.

Now to ask questions...

1. Since installing the variator and weights, I've noticed that the engine RPMS drop sharply when releasing the throttle instead of holding them and/or going through the progressive slowdown. What can be done to correct it?

2. It holds a nice idle, picks up and goes just fine. But when coming to idle, the scooter cuts off (causing a restart). What needs to be done to fix this? The carb has been kept clean by keeping Sea Foam in the gas tank.

3. Is there a way to calibrate the speedo for an accurate reading?

4. I read something about cutting a wire to the CDI. Would it be necessary to cut any wire? If so, which one to cut (see picture below)?



Other than that, the scooter runs nicely now. It almost feels...liberated! ;D

Could be running rich. Adjust the carb.

[replyingto=salracer]sailracer[/replyingto]What types of exhaust modifications? I know the stock one needs a "donut" gasket (still has the restrictive stock one). I've seen some exhausts with additional holes around the tip and underneath to reduce heat temps.

Hmmm, that does sound a bit simpler to do. Would it help to install a BBK as well?

Good morning!

I recently bought a used SunL 50cc scooter that I plan to use as a project bike. I want to pop in a "short case" 150cc engine, put in some performance tranny gears, and attach a "short can" slash cut exhaust (found some on EBay for a decent price). I'd also like to install a "lighter socket" charger that connects directly to the battery.

I've already bought 12" wheels/tires (current ones are 10") to improve ground clearance. This scooter does NOT have a rear swingarm, and I'd like to put one on because I want to install a second rear shock.

Questions:
1. Which tranny gear sets would be best for higher top speed (as in teeth count)?

2. I've seen others mention that some wielding is required to install a 150cc engine. Where will I need to do the wielding?

3. Anyone know where I can find the lighter socket chargers? I need one that wires directly to the battery.

4. What additional parts will I need (beside the swingarm) to attach the second rear shock?

Some pictures are attached to help with the recommendations.

UPDATE: Changed the wheels/tires on my scooter to standard-sized instead of low-profile, both were properly balanced before I bought them from the shop. The same vibration issue still exists and I hear a little "whinning grind" noise. Checked the variator/clutch/belt, and all three were in good condition (though I did clean the variator, it was gunky).

I'm seriously thinking that it's the tranny gears, given that everything else is intact. Does anyone know of a good performance set I can buy, and what ratio I need (I'm looking for longer gears)? Also, is it possible to put a 150cc tranny gear set on a "sleeper 63" scooter (out of curiosity)? Any help is appreciated!