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Post by craisin on May 13, 2014 15:15:27 GMT -5
My thoughts on this matter are no two 50cc GY6s will have the exact same mph.
Casting flaws in parts like pistons and intake manifolds sometimes can or cannot improve performance.
The law in my country indicates that it is ok to have 62cc but it cant exceed 30mph.
My country has a law that indicates if domestic violence happens round my place I have to report it and if another party reports it I can be fined heavily too.
If they deputise our smart phones we are all doomed.
I do not condone violence but am indicating the law could change like that on other matters
Sure i dont know the size of my engine i havent had the head off but it cant exceed 30mph and if it can there is enough evidence that the speedometer is inaccurate
k
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Post by scootzy on May 15, 2014 11:35:44 GMT -5
if your keeping the 50 bore the best things to do is:
1. open up the stock exhaust
I put 2 23/64's holes on bottom of muffler after first baffle plate.
it helps a lot with top-end power. almost too much flow!
2. A9 Cam
3. stroker crank
4. 20mm carb
If not keeping the 50 bore, I don't suggest this, but:
1. 52mm bore commonly called 110cc. I believe it's a 100-105cc
2. big Vv head or 3 Vv head
3. custom exhaust
custom exhaust, meaning the port size is the pipe size with 1/8" bigger tip then the pipe itself.
any pipe that is bigger than the port itself will rob you power!
4. CDI
5. oil cooler and catch can for the air cooled
And, of course,
re-gear the gearbox
bigger variator
rollers/sliders
springs main and clutch
use led lights head/turn/brake, this helps also.
preventive maintenance!
ride safe!
Darren
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Post by PCBGY6 on May 15, 2014 13:32:58 GMT -5
if your keeping the 50 bore the best things to do is: 1. open up the stock exhaust I put 2 23/64's holes on bottom of muffler after first baffle plate. it helps a lot with top-end power. almost too much flow! 2. A9 Cam 3. stroker crank 4. 20mm carb If not keeping the 50 bore, I don't suggest this, but: 1. 52mm bore commonly called 110cc. I believe it's a 100-105cc 2. big Vv head or 3 Vv head 3. custom exhaust custom exhaust, meaning the port size is the pipe size with 1/8" bigger tip then the pipe itself. any pipe that is bigger than the port itself will rob you power! 4. CDI 5. oil cooler and catch can for the air cooled And, of course, re-gear the gearbox bigger variator rollers/sliders springs main and clutch use led lights head/turn/brake, this helps also. preventive maintenance! ride safe! Darren . Now that's about the craziest thing I've read lately. Stoker crank, a9 cam and 20mm carb on a stock 39mm piston? That's a huge waist of money and time. |
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Post by alleyoop on May 15, 2014 13:51:22 GMT -5
That is why I said what I said some folks just don't know and throw out stuff out of their butt. But when someone does that the poor soul that does not know believes it and goes and is a wast of money and his scoot runs worse than when it was stock or cannot get it to run well at all.
Alleyoop
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Post by scootzy on May 15, 2014 14:15:35 GMT -5
but, everything I said is all in all of yalls sigs.
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Post by PCBGY6 on May 15, 2014 16:20:07 GMT -5
but, everything I said is all in all of yalls sigs. No sir. The people running the a9 cams have larger pistons. And not many people at all are running a Stroker crank. The ones who do are not running stock pistons like you said in your earlier post. Also, even if they ran a 52mm piston with a stoker I'm not sure it comes to 100cc motor. One of the math wiz guys can clear that up if they like. |
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Post by jjoshua20213 on May 16, 2014 11:16:01 GMT -5
I think that quoting a speed with wind pushing you or going downhill is silly. Of course, my scooter will go 50 if I had a 20mph wind perfectly pushing me. Has anyone drilled holes in the airbox or replaced the air filter? Some people claim good gains from that. I was personally happy to get the 4mph gain from the rollers. I am not sure if the performance variator will yield me much more beyond that. I live in Chicago in a very urban area. Street speeds limits are technically 30, but most people drive 35-40 when there isn't a lot of traffic. I am just trying to avoid being plowed over. Upper 30s mph would be sufficient. I've drilled holes; no help. Still getting around 33mph tops until wind comes into play. When people tell you they are going over 40mph on one of these things, be extremely skeptical and even if they prove it, understand that they are a rare, miraculous exception to the rule that binds 99.9% of us 50 owners. If you weight over a curtain amount a 50cc scooter will not go faster like you want it. More weight = the engine working harder. I put two batteries in a bookbag and I had less acel and top speed. Took the bag off and it went faster. If you want more power, simply buy it. |
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Post by jjoshua20213 on May 16, 2014 11:18:52 GMT -5
I put synthetic Castro 10w 40 oil in. i put in iridium spark in it. I put premium fuel. I have about 700 mile on it. I did inflate the tires...they were way low after winter. Oddly enough, they didn't produce any gains (well, so it seemed...with wind variances, etc....at hard to tell). I read about all these people saying they are getting 45-50mph on one of these scooters. Ultimately, it seems they 1) weight like 110 lb 2) have a "secret" 62cc. 3) have spent a ton on bbk, a lot of upgraded parts, etc. I'm one of them! My scoot does ~50MPH GPS verified (~60MPH on the speedo, which is not even there, because the speedo only indicates 'till 40MPH) 1- I'm 170 2- I don't know what I have (yet), but presume it's a regular 49cc (the manual says something like a 50.5cc) 3- Technically, I did not spend a cent on performance upgrades (windshield excluded, which can be debated if it actually causes speed gains or not). The scooter is very sensitive to wind and hills. With the least of them, I won't be able to get above 40. With strong winds, and uphill, I barely make 30MPH. I can only gain 45+ MPH after the engine has warmed up. It seems that doing a series of WOT accelerations, and engine braking, warms up the engine the fastest. But usually it takes a good 15-20 minutes, in 65-70 degrees weather, to get the engine hot enough. It also takes long stretches. If you are riding on a road with a lot of stop signs, you won't ever make 45MPH; as in my case, on a hot engine, it takes just under 10 blocks to get to top speed. I've also noted that BP Premium fuel is a lot different from other brands like chevron, shell, citgo, texaco, mobil, etc... For some reason I get more performance out of that fuel, not only with my scoots, but also with my car. On my Honda VT750 however, which is made to run on 87 oct fuel, I do not notice any performance difference WOT chops on an cold engine will quickly score your piston and cylinder walls. Why? Because metal expands unevenly. |
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Post by tvnacman on May 16, 2014 11:59:23 GMT -5
Sprocket said "NO REPLACEMENT FOR DISPLACEMENT"
I say you can get a little more edge in gearing and intake .
John
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Post by larry001964 on May 16, 2014 21:11:41 GMT -5
Hummm been reading this thread, and I think ill give my two cents for what it's worth...
The Stroker crank can be a handful, I had one, I used an NCY 52mm bbk, 50mm bb head. 20mm carb, free flow exhaust, NCY Hi Pro cam, 17/49 gears, and just about every other thing you can think of.. My top speed was 60 MPH, gps and police verified..
However components had a very short life, I went thru a mountains of variators, needed new premium drive belts every three months, had my cvt cut open for extra cooling... It was hard to start, especially in winter as the starter was barley able to handle the compression when turning it over, I had two 120 cca batteries wired in parallel.. In short i was working on it alot to keep it running... I don't really recommend a strocker for anyone that is not ready to put gobs of money in it, especially if it's a daily driver..
Here's my recommended build, an NCY 83cc bbk, Ncy 50mm bb head, A9 cam, 20mm carb, free flow exhaust.change your varitor weights, maybe change your gears to 16/50 ( Test First ) .... This can achieve about 48 mph pretty easily.. But more important is you will have the torque to handle hills and wind.. Otherwise i would avoid the stroker for the 139 unless your a seasoned mechanic with lots of time and money to put into it.
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Post by jjoshua20213 on May 18, 2014 23:40:36 GMT -5
Most TaoTao ATM50 riders in Miami beach, I see riding with speeds averaging 40MPH, or greater. Most modern scoots do 40MPH GPS, without performance upgrades. I disagree. These scooters are made to run under 30mph in order to meet restrictions in many states. For example, in IL if you have <50CC AND it goes less than 30mph, you don't need a special license. The TAO TAO site lists the top speed as 30-35MPH. Why on earth would they do that if the scooter easily did 40MPH? I believe the reason many people do upgrade them is to still have a <50cc (at least for licensing purposes). Otherwise, why not just buy a higher cc? I mean, many of these Chinese scooters, you can get the 150cc version for like $100 or $200 more than the 50cc version. Why spend hundreds trying to get better performance when you can get much more performance stock than you will probably ever get with upgrading without any aggravation or risk? My tao tao cy50-a went 45 flat stock, just took awhile to get there. Wasn't great on hills. |
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Post by scootzy on May 21, 2014 3:03:17 GMT -5
you want to know what I want to see for 50cc stock?  ?? Is a perfed head like this: this is where real performance comes from! people like this! www.somender-singh.com/and I like these: www.scooter-freaks.nl/forum/showthread.php?p=3439063definitely a torque mod! no doubt in my mind this is quality engineering! I'd like to see more people with better info than people who complain about others. just a thought! ride safe all!!! |
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Post by scootzy on May 21, 2014 3:22:16 GMT -5
Hummm been reading this thread, and I think ill give my two cents for what it's worth... The Stroker crank can be a handful, I had one, I used an NCY 52mm bbk, 50mm bb head. 20mm carb, free flow exhaust, NCY Hi Pro cam, 17/49 gears, and just about every other thing you can think of.. My top speed was 60 MPH, gps and police verified.. However components had a very short life, I went thru a mountains of variators, needed new premium drive belts every three months, had my cvt cut open for extra cooling... It was hard to start, especially in winter as the starter was barley able to handle the compression when turning it over, I had two 120 cca batteries wired in parallel.. In short i was working on it alot to keep it running... I don't really recommend a strocker for anyone that is not ready to put gobs of money in it, especially if it's a daily driver.. Here's my recommended build, an NCY 83cc bbk, Ncy 50mm bb head, A9 cam, 20mm carb, free flow exhaust.change your varitor weights, maybe change your gears to 16/50 ( Test First ) .... This can achieve about 48 mph pretty easily.. But more important is you will have the torque to handle hills and wind.. Otherwise i would avoid the stroker for the 139 unless your a seasoned mechanic with lots of time and money to put into it. This is why I didn't recommend all of the mods. I've got enough maintenance just with the 200-300mi oil changes and then that toooooo! I'm sticking to the 50cc running the A9, 7g roller, perf variator, 1500clutch, 2k main sprg, tad quicker gear set not sure on sizes. |
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Post by larry001964 on May 21, 2014 14:43:07 GMT -5
Ohhh I'm going to build another stroker engine, see if i can't iron out some of the issues i had before. But it won't be a daily driver or anything I rely on.. It will be just for fun. And perhaps something I can take to a twist and gone festival give Skeeterd a challenge, at least try to..
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Post by larry001964 on May 21, 2014 15:14:32 GMT -5
Well I'm not a big proponent of the 50cc engine... I just think even at it's best it's too underpowered. Where I live your always bucking an 8 to 20 mph head wind, your almost always going up a hill or down another. Your driving distances are measured in 5 to 10 mile increments..
I that is why i always upgrade a 50 cc to at least an 83cc and that seems to handle things much better... Perhaps if you live in town, you are surrounded by building, only driving 5 or 10 mins, and never on roads where the min speed is 35 they are ok, but I haven't found a situation where having a little more power wasn't a blessing..
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