55+MPH 50cc mods

[c3powil]

So heres the story.....
I long to ride, to build, to own... a motorcycle. I want the thrill, the coolness, the responsibility, but most importantly the gas mileage. Im 17 and living away from home in an apartment with my brother because my school grades and SAT scores qualified me to be able to skip my senior year of highschool and move on to college. I have to pay for my gas money myself, and the truck that I was given gets me a depressing 12-15 mpg. However, being 17 has its downfalls. My father dissaproves of most 2 wheeled automobiles, exept for the 50cc scooter. Why? Georgia law permits the use of a 50cc or less scooter without a tag, motorcycle license, or insurance. This, he likes. I, on the other hand, need something that will get me good gas savings, but wont hold up traffic everywhere I go.

What I want: A nicely built, sturdy, dependable 50cc two stroke scooter that has the ability to go around 55mph with upgrades. And I need you guys to help me along the way. Upgrades, you ask? Why yes, gradual upgrades that consist of derestricting, big bore kits, roller weights, and the like. But I need yall to to show me how.

Fist question. Which scooter should I start out with. I have a couple in mind already, but heres what I want. A 50cc two stroke that can get a minimum of 40-45 mph with minimum work (ie, simple derestricting).
LIST: Peugeot Speedfight 50cc, Keeway f-act 50cc, Aprilia sr50cc (ditech?), Honda ruckus, Yamaha zuma.
Thanks for reading, guys, and I hope for many responses. I plan to take many detailed pictures of my experience and leave this thread as a guide for anone wishing to accomplish the same feat.

[♣Luke♣]

are you going to use the scooter for leisure or comute to school??,,,if you are going to use it to comute to school do not get a 50cc especially 2 stroke,mygad!,,yes it's powerful;but if you are going to ride 45-50mph on that 50cc 2 stroke,,you need to at least change the piston every 3months,to get the proper compression to attain the 45-50mph. i'm sure not all will agree but, i have dealt with 50cc 2 stroke half of my lifetime so i know these things....i am going to tell you point blank, if you are serious with scootering get a 150 or 250cc japan scoot. ...with the price of a brand new chinese scoot you can buy a used 250cc japan scoot already....ok, on the choices you gave us,my best bet would be 150cc Honda ruckus....
i think for a 17yo,and considering that you were accelerated in school,you seem to be a very responsible person, and will become a responsible scooter rider too..good luck...and keep us posted.

[c3powil]

Well, see, the whole point is that my dad wont let me have anything but a 50cc scooter, so that ll I have to start with. It will be used for commuting to school, but I only need the 45-50 mph speeds for leisure commuting to my parents house (a 15 mile drive) once a week.

[edfr]

I have to tell you to get a 50cc to do 45-50mph you will need to bump the Displacement on it.
Just about all the 50ccs wil do in the 30mph, you have to mod it some just to reach 40 or close to 40. So your expectations of speed on a 50 is not realistic, so put that those kinds of speeds out of your mind.

A 150cc will do 50mph some a little over out of the crate and is at Wide Open Throttle.
A 250cc will do 60s out of the crate also at Wide Open Throttle.
Lefty

[c3powil]

I know that the Aprilia sr50 will do 45 or more right out of the box....

[edfr]

Those are numbers off the CHINO meter which are way off and not real U.S MPH don't believe everything you hear. But your young and you will learn.
Lefty

[korngames]

My friend has an SR50. He got the Leo Vince exhaust for it, which came with new rollers and clutch springs. With these mods, he passes cars going downhill. He paid $3500 for his scooter.

I own a Peace Sports 805, and we are about to install the 83cc kit for it. It is in my possession, I've just been lazy. I've already upgraded my clutch with 2000rpm springs, a 2000rpm torque spring, alternating 5g and 6g rollers, performance spark plug coil and iridium spark plug, performance exhaust, air filter, and jetted the carb at 88. I'm hoping that once I have the bore kit installed, I'll be able to hang with him. We'll see, though.

Also, I've installed LED running lights, flashers and brake light, LED instrument panel lights, an alarm system, a 139db horn, and a 12volt cigarette lighter in the seat compartment that I use to charge my phone. It runs to a switch next to my key ignition, so I can turn it on when I need it.

To get to my point, I'm not trying to brag about my scooter, I'm just pointing out that I've turned my scooter into a decent little machine, and it has cost me less than $2000, including the price of the scooter. Since you are only 17, I assume that money is an issue. I would look into getting something in the 139QMB GY6 family. Most of the people on this forum have them, so if you ever encounter any problems, you'll be backed by a legion of experts. I'm not calling myself one by any means, but there are some pros on this forum, and I've learned a lot of things by reading their posts.

[c3powil]

Thanks, Korngames! I like your idea a lot. Just explain to me what the heck that "139QMB GY6" means....

[korngames]

Most of the Chinese made 50cc scooters have that engine. It is a clone of a Honda engine. Check out Craigslist in your area, and type in Peace Sports.

[korngames]

This forum is great for learning. I bought my scooter on May 3, 2011. On May 2, 2011, I knew nothing about GY6 engines.

[c3powil]

Wow, so is any Peace sports 50cc scooter going to have that family engine? Im finding lots of great deals, people report speeds of 40-45 on these stock.

[korngames]

I am not sure about all of them, but (in my opinion) the sportiest looking models are the 804 and 805. They come with the 139QMB. I can't confirm the engine in other Peace models, but I assume they'd all have that engine, since most 4-stroke Chinese scooters have it.

[c3powil]

Thanks, man. I was unaware a 50cc 4 stroke could do this much. How fast do you think it will go once youve upgraded with the bore kit?

[dude]

Peugeot Speedfight 50cc I know nothing about
Keeway f-act 50cc Good choice
Aprilia sr50cc (ditech?)Good I like the older carb models
Honda ruckus Maybe not as fast
Yamaha zuma Good choice I ride. Plenty of add on perf. parts

[korngames]

I'm going to do some gear mods, but I'm hoping for 50 on a flat surface. Even stock, these scooters will hit 50 going downhill, so there is hope that I'll reach that. The fastest I've clocked my scooter (with a GPS) is 61mph, going down a GIANT hill. I'll never see speeds like that on a flat surface.

My favorite mod so far, (besides the sound on my exhaust) is my upgraded clutch/torque springs. It now does much better going uphill.

[c3powil]

Cool beans, Im thinking Im going to follow you on that route.

[larry001964]

Jun 27, 2011 20:47:32 GMT -5 c3powil said:

Wow, so is any Peace sports 50cc scooter going to have that family engine? Im finding lots of great deals, people report speeds of 40-45 on these stock.

Hello c3powil
I have a Peace Sports 804, I should tell you that while it's true many of these scooter will do 40 to 45 out of the box, one is really pushing that little engine hard to do it. Often pushing 8 to 9 thousand on the tack.. And that's not good long term on the engine..

[korngames]

I'm going to make a video one day soon of all of my mods, but whenever I have free time, I find myself riding my scooter!

Keep us posted with the route you take, and don't be afraid to purchase a used scooter. GY6 parts are cheap.

[gregw]

Yamaha Zuma! Easy to get parts for, very upgradeable!

[c3powil]

Larry, your sig says average speed. Does that mean your scooter can cruise comfortably at 40-45 with no problems sort or long term? Thats pretty much what Im looking for. Somthing that can cruise at those speeds for in town riding, but can also do 50 or 55 for a short distance on flats maybe once a week.

[bvance554]

You're going to waste a lot of time and money chasing 55 on a 50cc. You can't really identify a 50cc from a 150cc. So buy a 150cc and just tell your Dad its a 50. You can license it with the money you'll save.

[c3powil]

Unfortunately, Im a little too mature for that. Id rather earn trust the old fashioned way.

[smokiestover]

Jun 27, 2011 21:40:22 GMT -5 c3powil said:

Larry, your sig says average speed. Does that mean your scooter can cruise comfortably at 40-45 with no problems sort or long term? Thats pretty much what Im looking for. Somthing that can cruise at those speeds for in town riding, but can also do 50 or 55 for a short distance on flats maybe once a week.

This is simply not going to happen with a 50 cc. Forget the fantasy. If you can not have a 150 cc, find a good cheap old car that will deliver double the mileage you are getting with your truck. The mid-size Buicks (I have owned three) with the 3800 V-6 and automatic overdrive will do it. And they are far easier to work on than my scoot!

[♣Luke♣]

YES !!a modified 50cc with all that BBK(big bore kit)whatever will make your scooter run faster...BUT FOR HOW LONG???these almighty upgraders will only make your engine overheat,i have tons of friends who used BBK, they end up putting more time in fixing rather than riding......bvance554 is right, white lies are not really true lies,so you aren't comiting any sin at all...,pardon him, he's a modern day teeny bopper!lol ;D
and 35mph is just enough speed you need to get you to school,so why crave for 50mph? what you need to be more concern about is the torque, the power to climb a hilly road,that is if you have hilly roads in your area....to maximize the potential of the scooter, get the one that will fit your lifestyle ok?....it's 10pm ,i need to sleep now,,it's past my bedtime,i already took a glass of skim milk.

[fugaziiv]

Aprilia SR 50 Ditech will run 50mph with a couple of mods all day long at WOT simply due to the liquid cooling. I have one, I know. The older carb models are more reliable, but are like gold dust to find. With a couple mods such as a water trap, fuel regulator, transmission tune, exhaust and a de-restrict you will have an awesome scooter, not to mention one that will out handle just about any other scooter when the going gets twisty.

An older Kymco Super 9 2T LC is also another great reliable liquid cooled 2T option that can get your desired top speed with a handful of mods.

Anyway, just my .02

Matt

[dave50cc]

I have worked with both 2 and 4 stroke chinese 50's, I can say that 50 mph is no simple task. A scoot capable of 50 mph requires attention.

I just picked up a 50cc with a 150 engine, and I can say that box stock it runs in the 50's and has 3 times the power and acceleration. There is no contest between it and one of my modded 50cc's.

Attachments:

[dave50cc]

Roy is correct, it is best to know and follow your local laws. The laws here are very similar, but not enforced. I have had police tell me that they don't have time to mess with scooters. Here its almost a free for all, we have golf carts running up and down the roads, just yesterday I seen a woman riding a dirt bike down the road with no lights.

[D-cat]

Getting a 150 engine into a 50 frame is a mod job in and of itself.

If we are going to be honest in the restrictions, I agree to stop chasing 55 for cruising, it isn't going to happen.

Starting with a Peace Sports sounds like a good idea. Put in a 72cc kit (aka 80) AND a performance gear set (2.88 secondary), 1000 torque spring and maybe have to do some additional variator tuning. This will give you a fairly reliable engine that will cruise at around 40 all day long, maybe 45 leaning over, and could hit up to 60 on a downhill.

[Bong]

I vote for that Aprillia sr50. That little 2 stroke can haul you around very quick. Remember guys these 2t are a lot quicker than an average QMB.

[c3powil]

Police in my town are much the same way. They wont clock anything below an average sized motorcycle. Anyone familiar with the Tomos lx 50? It looks sweet like a cafe raer (...kinda) and is a 2 stroke.