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Post by cougarmccxxi on Dec 31, 2009 14:11:08 GMT -5
Top speed of your 50cc scooter, flat level ground and compensating for incorrect speedometer readings if appropriate.
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Post by sifu on Dec 31, 2009 15:41:25 GMT -5
Someone gets 47mph?? Damn what kind of mods is on that!?
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Post by cougarmccxxi on Dec 31, 2009 15:41:37 GMT -5
47 mph on level ground? Wow, how do you do it?
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Post by ron521 on Dec 31, 2009 17:30:06 GMT -5
Mine only does an indicated 36 @ 6500 rpm, leading me to suspect that I've got heavy rollers in the variator. On a long downhill, I reached 48 mph at a slightly higher rpm, and have seen over 7000 on the centerstand, so I'm sure my CDI is not limiting revs.
(later edit) checked the rollers, and they are 6.7 grams, quite a bit heavier than what many people prefer.
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Post by cougarmccxxi on Dec 31, 2009 19:46:46 GMT -5
Ron- My rollers (stock) are 8.5 grams...I've heard of many peeps running much lighter weights. I cruise about 37 on flats, downhill I don't gain more than 5 mph and it seems the engine RPM's stay flat; I think my CDI is limiting. However, I have no tach to substantiate the CDI is limiting.
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Post by ILLGotti on Dec 31, 2009 23:55:06 GMT -5
regarding the 47mph, just read my signature and that will tell you how. lol
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Post by cruiser66 on Jan 1, 2010 1:45:13 GMT -5
regarding the 47mph, just read my signature and that will tell you how. lol It sounds like you should be posting in a 72cc top speed poll, not the 50cc poll. I think 50cc means an engine with a displacement of 50cc not a scooter that was originally 50cc then modded to a higher displacement. BTW, 47 mph is a very good result. 66 |
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Post by ILLGotti on Jan 1, 2010 4:50:12 GMT -5
Well thanks for the props, I suppose. Regarding which poll to post in... if there was a 72cc top speed poll, I would indeed post to it. But theres not, and I voted.
Too late. ; )
lol
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Post by Bluefront on Jan 1, 2010 5:42:18 GMT -5
Both my Chinese 50s will do right at 41mph......stock. We are talking about 4-strokes, right?
At 45mph, the engine would be turning 9,000rpms. At 50mph, you'd be turning 10,00rpms. The red-line is 8,000. Keep that in mind as you're attempting any high-speed runs. I'd say the crank would be the first to go if you keep going past 8,000rpms for any extended periods.
With some jetting changes, a different air cleaner, maybe some different variator weights and belt.....45mph is a possibility. But you're pushing your luck with the stock engine internals.
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Post by ron521 on Jan 1, 2010 7:08:47 GMT -5
'Ron- My rollers (stock) are 8.5 grams...I've heard of many peeps running much lighter weights. I cruise about 37 on flats, downhill I don't gain more than 5 mph and it seems the engine RPM's stay flat; I think my CDI is limiting. However, I have no tach to substantiate the CDI is limiting. "
I've got a tach, and have noted how my RPM also remains nearly constant going uphill or downhill, and I've seen as much as 48 mph downhill with a very strong tailwind.
Apparently the variator adjusts depending on the load, gradient, wind conditions.
In my case, at least, the CDI is not a limiting factor, the scooter revs easily past 7000 on the centerstand, and sounds good at that speed.
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Post by cougarmccxxi on Jan 1, 2010 10:04:00 GMT -5
"I've got a tach, and have noted how my RPM also remains nearly constant going uphill or downhill"
Ron- You mentioned something I forgot about since I haven't been riding in a few months. My RPM's drop considerably when I go uphills. I think this condition is a symptom of roller weights that are too heavy but I have not pursued it.
My other thought about RPM's dropping is my contra spring may be weak; again, I have not pursued it.
What do you guys think?
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Post by kitcarguy on Jan 1, 2010 13:04:56 GMT -5
a 50cc with a 70cc kit is no longer a 50 so you do not count. When I had my Honda Spree many years ago it topped out at 35mph (indicated) no gps back then.
This poll is a bit misleading.
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Post by jayhawk on Jan 1, 2010 14:27:20 GMT -5
My Lambretta/Adly 50 does 47 mph on a long flat. Might go a mile or two faster, but I don't have a long enough flat in my area to find out. My speedo is dead on and verified by a live cop's speedgun (I tested at 30 mph) and one of those speed signs the cops put out - at 42 mph.
It's pure stock 2 stroke fun. 49cc minarelli clone.
Eric
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Post by cougarmccxxi on Jan 1, 2010 15:05:17 GMT -5
Jayhawk- I've heard of 2 stroke 50cc going that fast. I almost got a 2 stroker instead of a 4 when I bought for that very reason.
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Post by daniel50ccsunel on Jan 8, 2010 14:22:40 GMT -5
I have run 47mph on flat with up to 50mph with the help of the wind and maxed out at 56mpg down hill. All verified by cars beside me and my speedo is right. It is a true 50cc with only mods being a (power pack2 from monstergy6 with 6g weights, gates belt, tires that hold 45lbs of air, and a hydrogen kit but I stoped useing that). I put 9g slider weights in and lost a lot of top end and even hill pulling power. But I do not think stock motors was designed to run at those speeds for very long and after I could cruse at 47mph easly I lasted 1000 miles then one day at 50 it seezed the rings to the piston and lost compreshon. Now I ordered the 72cc kit from enviromoto, can't wait to see what that does. And I also weigh 220lbs, and run 45lbs of air in my tires.
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Post by beat4kings on Jan 11, 2010 20:25:31 GMT -5
I don't ride a scooter, I ride a 49ccm moped. I can go as fast as 50 cruising on a flat road.
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Post by nittany1 on Jan 14, 2010 13:47:38 GMT -5
I suspect all those 47 and above are two stroke. I suspect all the 42 and below are four stroke. Mine does 47 easy, it'll wind to 50 on flat land with a slight wind at your back. Yes, flat, I live in FL. We don't have hills.
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Post by qwertydude on Jan 29, 2010 23:12:16 GMT -5
I got mine all tuned up and it will now do on a calm day on flat roads 52 mph indicated but in reality GPS verified it is 45 mph. Basically it's just a Baja SC50 with a polini variator and deristricted airbox. It also helps that I'm only 130 pounds and can do a mean tuck. It seems all the mods in the world don't help if you weigh more than your scooter. In that case the best mod you can do for acceleration and top speed is to lose a few pounds. I used to have a sportbike and in the motorcycle club I'd see people spend $2500 for a titanium and carbon fiber exhaust that saved 10 pounds. Yet they got 90 pounds of excess weight that my bike didn't have to deal with really does help. And losing weight costs less than a $2500 exhaust.
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Post by als01seville on Jan 29, 2010 23:37:43 GMT -5
Just to verify, a 50cc doing over 40mph STOCK!!
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Post by qwertydude on Jan 29, 2010 23:57:32 GMT -5
Not stock it has the intake derestricted and has a polini variator with 6 gram rollers. Bone stock with restrictors in it still did 42 mph. Mind you this is with a good tuck on a long stretch of flat level road, talking helmet to the handlebars and elbows tucked in, but yes 45 mph gps confirmed.
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Post by diablo on Mar 5, 2010 13:06:23 GMT -5
2005 piaggio typhoon..........leo vince pipe, mallosi variator..........49mph
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Post by Scoot-Hacker on Mar 5, 2010 17:22:59 GMT -5
My Honda Metropolitain-I will do a CDI-governed maximum of 41mph.
Ungoverned or with a 10,500 CDI, I'm told it'll top out just under 50mph.
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Post by qwertydude on Mar 6, 2010 2:23:38 GMT -5
50mph with the Metropolitan only happens downhill with a tailwind. I had a Honda Metropolitan and after almost $1000 in mods, unlimited cdi, performance filter, polini variator, performance belt, light weights, and lots of tuning the carb I could achieve a gps verified top speed of only 45 mph with a good tuck on flats with no wind, sure the speedometer read just under 50 mph, actually it was way past the 40 mph max speedo reading and was near where 50 mph would be written. This is the same as my 139qmb Baja SC50's top speed. And all I needed to do to it was put in a polini variator and lighter weights. And to add insult to injury besides the whole scooter, plus registration and with the mods cost less than just the mods on the metropolitan.
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Post by aaron420e on Mar 6, 2011 22:15:21 GMT -5
My 09 Keeway F-Act Racing 50cc does 50+ on a flat. Bone stock, only thing I have done is replace the gear oil with a good synthetic and synthetic 2t oil.  |
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Post by feralsparky on Mar 6, 2011 22:28:41 GMT -5
My 2t will top out at 40mph on flat ground.
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Post by edfr on Mar 6, 2011 22:33:44 GMT -5
'Ron- My rollers (stock) are 8.5 grams...I've heard of many peeps running much lighter weights. I cruise about 37 on flats, downhill I don't gain more than 5 mph and it seems the engine RPM's stay flat; I think my CDI is limiting. However, I have no tach to substantiate the CDI is limiting. " I've got a tach, and have noted how my RPM also remains nearly constant going uphill or downhill, and I've seen as much as 48 mph downhill with a very strong tailwind. Apparently the variator adjusts depending on the load, gradient, wind conditions. In my case, at least, the CDI is not a limiting factor, the scooter revs easily past 7000 on the centerstand, and sounds good at that speed. That is exactly how you want the CVT tuned, you should not loose to many RPMS when going up a hill. It should stay in the powerband. You will loose some speed but the RPMS should not drop. If the RPMS drop a lot then you are lugging the engine and your speed will dramatically drop as well. Good job Ron521 Lefty |
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Post by coolchino on Mar 7, 2011 21:48:32 GMT -5
It was 40MPH, untill now. Engine is dying and will only run 35MPH on flat
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Post by sjpassa on Mar 13, 2011 0:35:40 GMT -5
mine will go 43 or so on a long trip and its stock all i have done is change the rollers to 6 grams and that is in the mountains of virginia where is is very hilly
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Post by heinz57 on Mar 13, 2011 1:26:21 GMT -5
my linhai 50cc will do 45 flat ground , thats what the speedometer says 50 with the wind slight downhill and its stock.
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Post by jessegar on Mar 13, 2011 6:30:58 GMT -5
Not a Scooter but I am hitting 60 Gps on my 79 Motobecane 50v! with Av10 reed valve motor.
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