FINAL GEARS ON GY6150 - ANYONE EXPERIENCED By gy6fandan (Read 356 times)

[gy6fandan]

Hello to everyone new here but have read post over the last year or so and allways finding something interesting and helpfull.

Alleyoop - If you still read and write on this forum your post from Oct 15, 2011 titled "VARIATORS WEIGHTS/SPRINGS/GEARS" was helpfull and interesting for sure. unfortunatly I never saw a followup on the final gears you chose and the pros and cons of the mod - your imput and results would be greatly appreciated.

My scoot is gy6150 (157qmj) primarily stock [no BBK]. Applicable upgrades would include performance variator, belt, sliders, 26mm carb vs 24mm stock, air filter to performance filter and 1500 rpm contra and clutch springs.

Anyone with actual changover experience and the results on similar setup would be appreciated - the pros and cons along with speed @ rpm at such.

Trying to get out of the 48 to 50 mph top speed range and into the 60 to 65 mph cruising speed with low rpm... Thinking 60mph @ 6k rpm (although I was reciently told that 6o mph @ 7000 to 7500 rpm more likely +-).

I bounced on scootdawg for a couple of years and now on another, so if your a forum jumper and notice this as higly similar dont be offended as the answers on the other post were also very HELPFULL concerning this question. Just seeking the options and results to better plug it all in.

Anyone with some real world testing info on the final gear mods / sizes, your imput & any small mod recomendations aside from those I have made (no BBK stuff = $$$) would be appreciated.

Thanks - GY6FANDAN....... its 1:15 am to bed till then

[Alleyoop]

Trying to get out of the 48 to 50 mph top speed range and into the 60 to 65 mph cruising speed with low rpm... Thinking 60mph @ 6k rpm (although I was reciently told that 6o mph @ 7000 to 7500 rpm more likely +-).

WHAT SIZE WHEELS ARE ON THE SCOOT? If 12s or 13s you should have no problems getting to 58-60mph, 65 would be a stretch.

My front tire is 13 and my rear DRIVE rims are 10s, BUT i put on 3" taller tires on the 10 inch rims so that brought my speed up nicely.
If you have 10inch rims then it will be more difficult.


48-50 with what you have on it now??? With performance variator and tuning the CVT you should get it to around 55mph. Now 60-65 will be pretty hard to do without more power, with taller gears and NO BBK you could get it to do 58-60 with 2up and 2 down on your tranny gears.
You should pick up 5-8 mph depending on how strong your motor is to pull the gears. Now once you reach speed you can then back off the throttle and with the taller gears it should hold the speed at a lower rpm.

Mine with the BBK I get it up to 50 back off the throttle and it will hold 50mph at 5100-5200 rpms, 60mph and it will hold 60 at 6100-6200. I have had it up to 70mph at little over 7000 rpms but that is to fast for me on the trike(HEHE). I usually cruise around at 45-60 which is fast enough for around here were I ride. I currently have 16/37 gears from 13/40 that were in there and like yours It would only do 48-50mph at 8200 rpms. I got a 115mm Variator and experimented with weights and Sliders and I run with 12g dr. pulley sliders.
Alleyoop

[gy6fandan]

Alleyoop , thanks for being there !

50 @ 5k rpm + and 60 at 6k rpm +, thats the idea I wanted to achieve. Banking those rpm for future use and a cooler running motor.

I have 130/60-13 (13") on both the front and rear tires - odd that the rim on the rear measures 14" outside to outside ? maybe I am measuring to much of the rim, the farthest part of the rim. Never had to measure a rim on anything because the tire numbers was all I ever needed.

Opened up the rear end last summer to check bearings, but did not think to count teeth on gears. I was doing rear wheel bearings and measured for internal bearings for upgrade of original to Nachi bearings. The constant small thump at 1 or 2 mph (twice per revolution) had me thinking to do bearings. The front bearings on the list also - but I stray from the subject, sorry.

Do you think my 157qmj long has 13/40. That is, are these useually stock size ?

On your original post --> scooterdoc.proboards.com/index.cgi?board=techtips&action=display&thread=5231
you showed a 17/37 and a 18/36 which may have been for reference because the gears were pictured. But the 16/37 your using seem to be working nicely speed and rpm wise.

How does the take off and average hill climbing (suburban areas - not country or great smokey mountain hills) do for you ?

[Alleyoop]

Yea I fixed the picture they are 16/37 --3up and 3 down from what came with the motor.

As far as the hills I have the cvt setup to hold the RPMS and just loose some mph. I have a pretty steep hill and long and I can hit it at any speed at the bottom and will only loose 5mph when I get to the top but the RPMS hold which is what you want otherwise you will loose a lot of mph getting to the top. The other thing Is I still have some throttle left so I can get that 5 mph back(HEHE).
Alleyoop