Tag Archives: Koso Racing

Clutch Win

With the Kaiju broken in we did the final upgrade before the winter in prep for the future, we wanted to do an overhaul on the transmission. So many different types of variator and clutches for the gy6 its pretty much limitless of combination. We wanted to make sure that we have enough grip even if do a Big Bore upgrade later on, so we looked into all types of clutches from the standard “racing clutch” to a more sophisticated multi-adjustable clutch system. The end result was the Koso Delta Clutch System paired with the Koso CNC racing Clutch Bell.

The Koso has adjustable weights on top of the swappable spring rates. The weights help the clutch spin engage faster and hold longer to prevent slippage after long and repetitive  engagement. Matching it with the Koso CNC Bell will help reduce rotational weight and keep the clutch cooler due to bigger ventilation.  The weight reduction is huge with 50% less weight than stock.

Now that we picked out the Clutch system, we wanted also looked into the variator kit. We picked up a Motorio  dual ramp system.  The theory goes that using different weights and different ramp angle will help increase acceleration and boost top speed at the same time with no cons (sounds too good to be true) . Will see how true this actually is and report back once we get more riding time with the new setup. As for the kit it came with 115mm variator, boss, Drive face, 3 sets of weights.

We installed 9g and 12.5g, (the stock system had a 12.75g setup after averaging  out all 6 weights)

For the clutch removal and install we used a 1-1/2″ socket to remove the clutch nut.

Take a look at the stock vs. koso

Back on the bike

We are also using the longer Gates belt 842x20x30. Time to test and tune! Will report back on the outcome of this variator kit, for my initial testing after the clutch has broken in, the bike seems to rev a lot faster now since it has less rotational mass and the acceleration from 30-50 is much quicker and very noticeable , will be doing top speed test soon now that LSD is fixed.  Stay tuned..  – LoS

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