Kymco Super 8 - 4 stroke - more speed

[waqr]

Hi!



I just bought a 2009 Super 8 (4 stroke version) and I have removed the shoulder on the variator boss and I have also removed one of the purpole wires going into the CDI. By doing this I increased the top speed with roughly 7mph to 32mph. However, I would like to reach atleast 35mph. I noticed that the variator roller weights are pretty heavy (about 7 grams) Will I gain or loose top speed if changing to 5,5gram roller? I know that you usually loose top speed with lighter rollers but maybe the stock ones are just to heavy



Would be interesting to hear from someone who actually have experience with this scooter.



Thanks!

PS. I know that the 2 stroke version is more powerful but I wanted to try out the 4 stroke since I mainly use it for commuting to work.

[90GTVert]

A lot of times it is said that heavier rollers = more speed and lighter rollers = better acceleration. It's not that simple though. What you really need to do is to find what your CVT/engine like. Heavier rollers should reduce RPM and lighter rollers should increase RPM. You can try to find the rollers that keep your engine where it's making the most power and see if that bumps up your speed. If you already have the 5.5g rollers, my best advice is to try them and see what happens. To give yourself a better idea of the changes, perform some sort of performance test with the 7g rollers before you change to 5.5g. Do the same with the 5.5g and record the results for both. The results should tell you which work better for you. I usually do a long test run at full throttle one way and then turn around and do it the other way. That reduces influences like wind and grade compared to using just one direction of travel.

www.49ccscoot.com/faq/whatweight.html

[adkbiker]

On my 2014 Kymco Agility there was a large aluminum washer inside the intake manifold restricting airflow. It may not apply to your model but might be worth a look.
www.youtube.com/watch?v=AATbMHQsau4

[humanshield]

Aug 16, 2016 1:48:15 GMT -5 waqr said:

Would be interesting to hear from someone who actually have experience with this scooter.

Just so you know, don't limit yourself to asking people who only have that particular scooter.
Most Chinese scooters use the exact same motor, frames, electrics, hardware and often the ONLY difference is the fairings.

You'll get a lot more good help not limiting your responses that way. 

[waqr]

Thanks for the replies.

Humanshield: You are correct. My mistake!

I just ordered 6 gram weights and large main jets. We will see if this make any difference.

[humanshield]

No worries. I really like the Kymco look. Would love to find one I could work my magic on

[waqr]

Tried lighter weights but no difference in top speed. Seems like the belt is not going all the way up on the variator.

Maybe a shorter variator boss could increase speed (in combination with even lighter weights)

[kagetenshi]

I would be careful with going too far below 5 gram weights. The shorter drive boss might be the ticket. Or a different variator. I don't know much about the kymco scoots.

[kagetenshi]

It could be that the angle on your variator is too extreme and that you would need one with a less severe angle between the plates (a more accute angle when flush).

[waqr]

Found this kit at Racingplanet but can`t really understand why they send you stock length on the variator boss together with schims. As I understand you can only use the schims to make the boss longer hence decrease top speed. I want to increase the top speed hence shorten the variator boss but then I can`t use this kit I assume?

www.racing-planet.se/reservdelar-scooter-variatorhylsa-naraku-speed-kit-gy6-kymco-p-440388-1.html?backcPathco=3&cPath=59522_66842#.V8WM1VuLRaQ

[90GTVert]

If it measures the same as your drive boss, then just buy shims if you want to try effectively elongating the boss. I'd imagine that kit is largely purchased by the folks that get a Kymco with the restrictor style drive boss.

Not much way to shorten them other than remove material. If you do that, be sure to keep it square. Then you can add shims if it doesn't work out.

[waqr]

Seems like I have tried all the easy steps to get more speed out of my 4 stroke Kymco Super 8. Don`t get me wrong I really love this bike but the only thing missing is a few mph. Today it is topping out at 33mph but I would like to get a top speed of atleast 36mph. I would need advice what I can do to achieve this. In stock restricted form it topped out at 28mph. This is what I have done so far:

- Changed variator boss to a smooth one (38mm long)

- Removed the purple wire from the CDI

Both the above actions increased the speed to 33mph. I have also done the following modification but they didn`t give any speed increase:


- Changed main jet from 80 to 84 (will also try 86)

- Removed the snorkel from the airbox

- Added a slightly longer belt (737mm when stock is 728mm)

- Lighter roller weights (stock is 6,5g and I replaced them with 6 gram rollers)


So what is the next thing to try in order to get a few more mph?


Thanks!

[mclark999]

Lose twenty pounds and put more air in the tires.

The lighter rollers probably helped your acceleration, but could hurt your top speed.

['O'Verse]

Aug 20, 2016 3:59:09 GMT -5 waqr said:

Tried lighter weights but no difference in top speed. Seems like the belt is not going all the way up on the variator.

Maybe a shorter variator boss could increase speed (in combination with even lighter weights)

By looking at this photo. Your belt has never reached the top of your variator. My guess is you have atleast 5+mm more travel. Either a slightly longer belt or 7+gram roller weights. Depending on your current rpm's.

[waqr]

Thanks for the reply!

I have tried a longer belt without any difference in speed.

I am afraid that 7 gram weights will make the bike extremely slow in acceleration but maybe this is the only way to get the belt to travel all the way?