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Hi all,
I was wondering if there was some kind of master list that would show the stock reduction gears for Kymco Scooters.

I am not having any luck finding out what the stock gears are for my 2015 Kymco Super 8 50R (4 stroke)

so I tried an high volume air filter from Malossii.
 connection
Ended up being to small to fit the carb.  I was expecting a rubber gasket style but it was hard plastic.  so in my ;how can I connect this mode I realized that it would fit the front of the current air box.  Tried this, and it didn't go so well.  The box has a natural reduction in the inlet that was basically choking the engine once I hit 50 km/h

So back to the old air filter, but I had bought these little 1" air filter plugs that I drill the air box cover out for and they pop in just in front of the air filter.  This has seemed to help with the power a little.  went back to the 6.5 gram rollers and now I am hitting 60 km/h fairly quickly and topping out at 67-68 km/h.

Curious if maybe going to 6.2 grams or doing a 6.2-6.5 mix would get me those last few km/h I am looking for?

Note that I had to switch out the tachometer for w new one as the batter in  the first one died and wasn't replaceable.  New one is.  but it is showing 7600 at 67km/h and showed 7800 when I did hit 70km/h on a slight downhill.

So have the Naraku White Contra Spring installed again (1000rpm) with the heavy clutch springs still installed.

Installed a tachometer and I think I need more RPM's

7600 RPM at 65km/h

Thoughts from the group?

Pretty much with the other folks on this one.  A 50cc 4 stroke's only gonna take ya so far.

If 50cc is your passion for whatever reason I'd be looking for a 2 stroke before doing more with this one.

If not then look into something with a bit bigger motor.
You can tweak 'em all ya want, in the end There's no replacement for displacement.

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Figured out the issue.  Needs a secondary gear upgrade.  Seems that with the 4T the limit them 65km/h
With the BBK the power is now there for the for a 10% upgrade.

Now to find the secondary gear

You don't seem to have improved your top speed at all.  Is that correct?  Did you do upgrades incrementally or all at one time?  Oh...did you ever install the smooth boss bushing?

I did things incrementally.  First the smooth boss then the a larger jet (80-82).  These both came with the scooter when I purchased it.
Then I upgraded the exhaust and installed the Polini Hi-Speed variator. 

Got to 65km/h then I went the BBK route for more power/ a little extra speed.  I didn't have the expectation of doing 90km/h. I just want a steady 70km/h whcih was only 5 extra km/h

Big bore kits offer more torque for hills and headwinds, but the drive pulley ratio remains the same relative to crankshaft revolutions . . unless rear gears are changed.

Unbalanced rotational dynamics also enhance the odds of crankshaft and connecting rod bearing failure.  Pretty much a lose/lose situation!

For others researching . . initially select a scooter model with an engine size suitable for your speed expectations, and keep it stock!

I have read many different things and most say that the bottom of the motor is pretty much the same from 50cc-125cc.

I wasn't looking for great speed gains 5-10km/h  I am not looking at turning my scooter into a hotrod just a safe rod.

Hey all trying to figure out why I can't get a solid 70-75 km/h out of my 2015 Super8 4T.  I seem stuck at 65km/h

I have done the following

72cc BBK
Polini Hi-Speed Variator w/ 6.5 weights
1000RPM Contra Spring (was a 750 stock) - Looking to go to the 2000 RPM spring with the new power from the 72cc BBK
Technigas Silent exhaust installed.
derestricted CDi (removed purple wire)

In Canada I have great luck with https://www.scootertuning.ca/en/

They are super helpful and have a great return policy