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Post by metrodee on Jul 4, 2013 8:59:21 GMT -5
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.     |
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Post by sailracer on Jul 4, 2013 9:23:03 GMT -5
12" tires will not fit on a short case motor. You need a long case. I don't know what you mean by a swingarm, But the entire motor assembly IS the swingarm. You can install the second shock with a bracket. ;D You will also need to do extensive changes to the frame to mount a 150 in there, as the mounts are totally different. they are on the top of the case ;D
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Post by jerseyboy on Jul 4, 2013 9:36:39 GMT -5
Heck thats a nice scoot,,I would just do the free flow intake/exhaust,up jet,coil,cdi,and run the heck outta it...lol
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Post by metrodee on Jul 4, 2013 9:38:23 GMT -5
12" tires will not fit on a short case motor. You need a long case. I don't know what you mean by a swingarm, But the entire motor assembly IS the swingarm. You can install the second shock with a bracket. ;D You will also need to do extensive changes to the frame to mount a 150 in there, as the mounts are totally different. they are on the top of the case ;D This is what I was talking about. www.ebay.com/itm/08-ITALICA-SCOOTER-SWINGARM-/400419849989?pt=Motorcycles_Parts_Accessories&hash=item5d3ae20705&vxp=mtrMy Taotao CY50-T3 has one mounted on the rear tire, attached to the engine as the exhaust. It had a shock mounted in the top hole, as seen in this photo.  |
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Post by metrodee on Jul 4, 2013 9:45:32 GMT -5
Heck thats a nice scoot,,I would just do the free flow intake/exhaust,up jet,coil,cdi,and run the heck outta it...lol Hmmm, that does sound a bit simpler to do. Would it help to install a BBK as well? |
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Post by jerseyboy on Jul 4, 2013 10:06:15 GMT -5
[replyingto=metrodee]metrodee[/replyingto]Of coarse,,more displacement always helps,,you may loose a little reliability with a BBK but as long as you have it jetted properly they can last a long time  |
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Post by metrodee on Jul 4, 2013 10:28:54 GMT -5
As mentioned, I'm also looking to install performance gears as well. Which set would I need to buy to increase top speed? NOTE: I have an unused "Scrappy Dog" set of 16x50 tranny gears. Will they do, or would I need to get something different to increase top speed performance?  UPDATE: Located the "lighter socket" I was looking for. Part ordered! |
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Post by sailracer on Jul 4, 2013 10:30:12 GMT -5
Yeah, that's a bracket. technically not a swingarm.But that would be the easiest part of the project. I would just build on what you already have, It's a real nice platform ;D I would do a BBK,carb.variator,CDI,Coil Maybe intake and exhaust mods. and the 50/16 gears are a good choice
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Post by jerseyboy on Jul 4, 2013 10:54:34 GMT -5
Not sure,,but I want to up gear one size from what i have also,,I need to tear it apart first,,it runs great now so I prolly wait until Winter time to do gears.
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Post by metrodee on Jul 4, 2013 10:54:53 GMT -5
[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.
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Post by sailracer on Jul 4, 2013 11:26:19 GMT -5
yeah some guys do that. I've heard of some guys drilling 3/8" holes on the underside if the stock airbox cover for more air. You have to experiment with different jets to get the optimum performance you want with a good fuel/air mixture.It's a trial & error process until you get it just right. You should start with a goal in mind, and make adjustments till you get there ;D
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Post by jerseyboy on Jul 4, 2013 19:25:30 GMT -5
[replyingto=salracer]sailracer[/replyingto]I know after I drilled out my stock air box with stock cleaner,,the scooter wouldn't run right from mid to high with the stock jet,,still had the stock exhaust on it,,but just drilling a few holes and it needed a 110 from a 102,,after the exhaust and UNI,,it needed bigger 115 ran great,,i put a 118 in there just to be safe cause it runs so good and the plug looks awesome!
They come so lean from the factory,,but adjusting the A/F screw usually takes care of that with a stock unit.
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Post by metrodee on Aug 1, 2013 21:03:56 GMT -5
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 |
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jet
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.