getting upset

[joe]

ok so far my scoot is topping out at 40 this is what iv done so far
72cc bbk
85 main jet
a9 cam
and it hit 40 after just the bbk and even after the other upgrades it still wont budge past 40
and it just feels like it has more power to give  but something is stopping it and i dont know what
it just feels like its dragging something really heavy
im 215 and iv read about bigger people going 50-55
what else should i do to get it up to at least 45 it would be great to get it to 50

thanks in advance

[scooterpimp]

Any cvt restrictions? Like the spacer in variator? , do any cvt tuning yet? Like lighter rollers/sliders ?

[90GTVert]

What RPM are you at doing 40MPH?

Have you ever been through a carb tuning process as suggested or just swapped in the 85 from the 75 (IIRC)?

[joe]

no restrictions of any kind left except for maybe exhaust and no tuning to the transmission yet

[scooterpimp]

Like 90gtvert stated , is # 85 jet too large causing engine to bog at higher rpm? Sparkplug wet/sooty?

[usmcdoc]

Jul 28, 2015 18:14:20 GMT -5 joe said:

no restrictions of any kind left except for maybe exhaust and no tuning to the transmission yet

You just answered your own question up there ^ No tuning to the transmission. Without that you can put a 440 Dodge V8 engine in that thing..and you will still only go 40mph. Why? Because you can only go as fast as gearing and CVT/Transmission tuning allows. I have 2 posts for ya..PLEASE read them and then you should have no questions..AND a faster Scoot.. 1. 49ccscoot.proboards.com/thread/13160/discovered-type-scoot-restriction-today
2. www.apexatv.com/techsupport/apexclutch.pdf
Enjoy...Glenn

[joe]

i did tune it and the 85 looks smaller the the 75 is that right or i might have looked at that wrong
i dont have the cash for a tach should i save and invest in one?

[Fox]

There's is such a thing at too much air to the carburetor.

What type of air filter are you running?

What color is the spark plug?

Have you played with different carb needle settings?

[usmcdoc]

Jul 28, 2015 19:22:06 GMT -5 Fox said:

There's is such a thing at too much air to the carburetor.

What type of air filter are you running?

What color is the spark plug?

Have you played with different carb needle settings?

Dave..I agree..so many unknown variables.. A plug pic would be nice as you mentioned..

[backtrackbug]

Dont get upset man. I just did a 50mm bbk, a A9 cam, DLH variator, #90 jet with new carb, new belt. Im getting 40mph (gps) on flat ground, maybe 42-43 downhill. My stock 49cc speed was 37mph on flat and 40-43 downhill!

My brother just did a 50mm bbk and jetted carb and he is at 48-50mph, same make and model scooter.
These china scoots vary from motor to motor off the assembly line.

But doesnt the bbk pull harder and stronger? Quicker off the line? Im betting it does.
Its prolly down to cvt tuning and different gears now for you, just like me. Go to my profile and check out my threads, we are experiencing the same thing.

Dont get impatient, parts are cheap. Buy the cheaper parts to experiment to get the results you want and learn from the process, then get better quality to replace after market parts as you can afford.

I would start researching on different final drive gears once you know you have the bugs worked out in what you have now.
Check valve lash, a/f mixture on carb. And these guys here a gurus when it comes to cvt tuning.

Hell, my displacement is more than yours and we have same top speed. Once you get it dialed in and all the tuning done, maybe a gear swap, youll be in the wind.

[derbiman]

Maybe the cdi is restricted. The cdi on my Tomos Nitro is restricted right around 40 mph.

[joe]

ill see if i can get some pics tomorrow kinda busy and thanks for the help so far