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Post by humanshield on Feb 8, 2015 18:57:02 GMT -5
I finally took the scoot out with a GPS and got the GPS top speed.
41.94mph (revised)
Granted, if I had had a longer straightaway I might have eventually hit 42 or even 43. This was around 1/2 mile for the record.
Now I'm just wondering if that speed really sucks, is about par, or is better than average for nothing more than an 83cc BBK
I did manage 42 with the 49cc motor once day a month ago before the BBK but IIRC, there was a good tail wind.
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Post by scooterpimp on Feb 8, 2015 21:15:35 GMT -5
As it breaks in it will improve , keep eye on sparkplug for jetting reasons. Keep oil full & ride it.  most important dont tuck in with full face helmet(knocked off mount) & destroy your wifes iphone when using it for gps testing like i did.  |
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Post by humanshield on Feb 8, 2015 21:48:31 GMT -5
 I was using my Galaxy and was pretty worried about it |
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Post by jc33777 on Feb 9, 2015 13:00:33 GMT -5
I had about a 3mph head wind but was fully tucked I put my phone in my glove box though   |
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Post by humanshield on Feb 9, 2015 14:52:48 GMT -5
Hey jc33777
Do you have a BBK installed ?
Ok, now I didn't "tuck". Was I supposed to? I guess there's some factors that make a difference.
When people show their max speeds is that usually "tucked" down?
I "think" I would have hit about 44 if I had "tucked" down low and tried to make myself more aerodynamic.
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Post by jhobe6678 on Feb 9, 2015 15:05:21 GMT -5
I got 47.9mph GPS on my M1 after the 72cc BBK install. Not much wind that night and I was on a long straight road for a while. May have been a fluke and that was before I started to really tune it though. Depends on rider weight, tune and overall condition of the engine. My M1 had <500 miles when I got it, barely cracking 800 now maybe.
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Post by jc33777 on Feb 9, 2015 15:09:04 GMT -5
Hey jc33777Do you have a BBK installed ? Ok, now I didn't "tuck". Was I supposed to? I guess there's some factors that make a difference. When people show their max speeds is that usually "tucked" down? I "think" I would have hit about 44 if I had "tucked" down low and tried to make myself more aerodynamic. completely stock and I weigh about 210 and I can't say if most people go tucked for top speed test but I would think so it made about 4mph difference for me |
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Post by humanshield on Feb 9, 2015 15:19:21 GMT -5
Hmmm...sounds like my 38.59mph is a bit pathetic for an 83mm piston.  But wait...my scoot's dry weight is 190lbs and I'm 205 lbs. Is 190lbs heavy for a 50cc scooter? I think I have one of the heavier scoots. jhobe6678,
I see you have an A9 cam. Big Valve Head? My kit came with a stock valve size head.
So I have absolutely no mods other than a bigger piston.
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Post by scooterpimp on Feb 9, 2015 18:18:29 GMT -5
Alot depends what gearing your scoot came with too!
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Post by jhobe6678 on Feb 10, 2015 6:51:08 GMT -5
Hmmm...sounds like my 38.59mph is a bit pathetic for an 83mm piston. But wait...my scoot's dry weight is 190lbs and I'm 205 lbs. Is 190lbs heavy for a 50cc scooter? I think I have one of the heavier scoots. jhobe6678,
I see you have an A9 cam. Big Valve Head? My kit came with a stock valve size head.
So I have absolutely no mods other than a bigger piston.
No, I have the stock head on there and I believe the 64mm valves. Yes I have the A9 Cam, not sure how much that helps. My scoot is about 240lbs and I myself am about 235lbs. I'm a short wide sail for it lol. I can't get on it for any recent speed tests though, that's not going to happen for a while till I get function of my leg back. But I'd be glad to throw in some input when I can still. |
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Post by humanshield on Feb 10, 2015 14:53:55 GMT -5
wow.
I wonder if the 83cc kit is just too much for the stock head and exhaust?
Maybe it's trying too move too much air through restricted passages?
I would be interested to hear from others who have done nothing but added the 50mm piston to bring their motor up to 83cc. No cam, No Big Valve Head. Nothing but the piston size increase like mine.
I might try a run with no muffler and not air box just to see.
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Post by niz76 on Feb 11, 2015 6:05:12 GMT -5
wow. I wonder if the 83cc kit is just too much for the stock head and exhaust? Maybe it's trying too move too much air through restricted passages? I would be interested to hear from others who have done nothing but added the 50mm piston to bring their motor up to 83cc. No cam, No Big Valve Head. Nothing but the piston size increase like mine. I might try a run with no muffler and not air box just to see. I did that to a flip scoot that just needed a new top end. Installed a 50mm BBK and nothing else. I never GPS'd it and I had heavy roller weights in to "detune" it to keep the RPM's down (so the crank didn't break) and I can say I wasn't impressed with it's speed. It sure did have a lot of torque though! |
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Post by jhobe6678 on Feb 11, 2015 6:51:22 GMT -5
wow. I wonder if the 83cc kit is just too much for the stock head and exhaust? Maybe it's trying too move too much air through restricted passages? I would be interested to hear from others who have done nothing but added the 50mm piston to bring their motor up to 83cc. No cam, No Big Valve Head. Nothing but the piston size increase like mine. I might try a run with no muffler and not air box just to see. I did that to a flip scoot that just needed a new top end. Installed a 50mm BBK and nothing else. I never GPS'd it and I had heavy roller weights in to "detune" it to keep the RPM's down (so the crank didn't break) and I can say I wasn't impressed with it's speed. It sure did have a lot of torque though! I think on a 4t, torque is more of what you get. Just ask my scoot that torqued me right off of it in the grass lol. It definitely helps the low end more. |
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Post by humanshield on Feb 11, 2015 23:39:57 GMT -5
I did that to a flip scoot that just needed a new top end. Installed a 50mm BBK and nothing else. I never GPS'd it and I had heavy roller weights in to "detune" it to keep the RPM's down (so the crank didn't break) and I can say I wasn't impressed with it's speed. It sure did have a lot of torque though! I think on a 4t, torque is more of what you get. Just ask my scoot that torqued me right off of it in the grass lol. It definitely helps the low end more. I WISH mine had that kind of torque. I can still hold it back fairly easily with the 83cc BBK I have the feeling at some point Im gonna to find "something" holding this thing back and it's gonna be a game changer. |
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Post by jhobe6678 on Feb 12, 2015 9:04:44 GMT -5
I think on a 4t, torque is more of what you get. Just ask my scoot that torqued me right off of it in the grass lol. It definitely helps the low end more. I WISH mine had that kind of torque. I can still hold it back fairly easily with the 83cc BBK I have the feeling at some point Im gonna to find "something" holding this thing back and it's gonna be a game changer. If and when you figure it out, be sure to let us all know. I'd love to get more stable top end speed out of mine, though I think when you're in this class of engine size and upgrades (Bore & Cam) the only thing you can do after this is a gear upgrade. I have the Hoca variator on there and have played with weights but I have a feeling I'll start over on that again. I'm thinking of looking for some over range pulleys, but they're so damn expensive I don't think they're worth it. |
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