Glixal ATKS-03901 Chinese Scooter High Performance Racing Torque Spring clutch springs GY6 50cc-100cc 139QMB 1P39QMB Engine Moped ATV (1000RPM,Blue)

These give better throttle response and uphill speed on 80cc and 100cc.On 50cc the contra spring cuts take off speed keeping 50cc rpm very high not reaching over gear "Belt to open clutch fully".The "clutch springs" give better pulling power from stopping to pulling away on 50cc,80cc and 100cc.When reinstalling the clutch the easiest way to put the belt back on is to squeeze the clutch open using both hands holding open put the belt on the open clutch then reinstall the clutch with the belt already holding the clutch open to fit over variator easily.Install a new belt also check your variator and weights for wear and no binding.I use Wingsmoto Roller Performance 4 Gram Weights 16X13 in all my mopeds and servicing others mopeds.Caution don't go full throttle constantly down hill's.

Perfect medium spring for your scooter

I used this yellow contra spring, red 2000k clutch springs, and 5g sliders on my 80cc BBK swapped scooter. After trying a bunch of combinations of parts, this seems like the most desirable riding characteristics.

Product was in good condition and came with everything in picture. I installed a BBK and added 6-1/2 roller weights I then drove the scooter around and wow it was fast with good tack off mid and top range . I wanted better performance yet so I got this 1500rpm spring I installed it test drove it and lost performance upon tack off It would have to Rev up much more before moving all and all top speed was the same lost tack off and mid , plus it was more stress on the motor and drive train the motor temp went up big time from working harder and the clutch belt and roller s got hot also . I can't say anything bad about the spring it's self it just did not Serv my "Little' scooter any Justice perhaps on a bigger mope like a 150cc it would give the correct performance. I don not recommend for a 50cc not eaven with a BBK .

Paint was already chipping off when arrived- cheap

There are different lengths of springs available from other sellers. The 50cc springs are noticeably shorter regardless of the rpm range. Other than letting you this. They are just what I wanted and, I'm happy with them.Only time will tell if they hold up well or weaken.I'll try to remember to update my review over the next few years. It’s now March 2023 and it’s still preforming as it should No noticeable weakening

For the price and quick response in delivery you cant beat it anywhere. These springs perform exactly as the more expensive name brand "high performance" parts do when used in the right application.

Works great.no complaints.

No me sirvieron para la moto que queria, pero los ocupe para otra y quedaron excelentes, recomiendo revisen bien las medidas que necesitan, fuera de eso excelente producto

Perfect replacement / tuning for a GY6 Benzhou 50cc Scooter. Mind you folks have to realize there is no unique recipe with those Scooter parts, a lot of variables depending on your configuration, weight etc. Keep on swapping springs and variateur Rollers until you find the sweet spot for you.

Fast shipping