Poor Performance after upgrade

[retirednow]

Hi All,
Jusr replaced the variator on my 2008 Wildfire 50 with a Koso performance variator and 6g sliders. Also a new, standard belt.
Overall performance worse~hill-climbing, acceleration, top-end speed. Old variator also had 6g rollers.
Any ideas? Thinking of trying 5g sliders.

[speedy1125]

I have found that 5g rollers get a rider who is 180 lbs or less into 6500-7500 rpm range, thats where a QMB makes the most power. You will need to fine tune to your specific setup. You can get light weights like 4g and fill them in with electrical solder then drill them out in steps to find your ideal weight. this is much cheaper than buying entire sets of different weights but final result should be 5g - 6g.

49ccscoot.proboards.com/index.cgi?board=4ttech&action=display&thread=2758&page=1

Use a 'tiny tach' to get your rpm while tuning
example:
www.amazon.com/Tiny-Tach-Hour-Meter-TT2A/dp/B0045L9GA0

shop around for a better deal, thats kinda high

[retirednow]

Thanks,
I'm 150 lbs.
Before the new sliders was getting 7k rpms at top speed.
Any real advantage of sliders over rollers?

[speedy1125]

to put it simply, sliders the dont develop flat spots like rollers do. when rollers develop wear (flatting or flat spotting) your top speed will decrease.

[speedy1125]

Here is some more good info on tuning a QMB. Our brother StepThruTuner tells it well,

49ccscoot.proboards.com/index.cgi?board=4ttech&action=display&thread=407

The 'fill & drill' on the weights is a great cost-cutting way to find your ideal weight then get that in longer lasting sliders. I have found that a stock variator works best on the engines i have set-up for a few customers recently. HP variators actually kill performance until you get into serious mods that make lots of torque.