Replacement Sprocket.
10, 11, & 12 tooth sprockets require special drums.. 13 T and up use same drum. For drums see
http://www.nrracing.com/product-p/mtdsurm.htm

Price Shown is for 11 to 13 tooth, other are slightly higher. Correct price will be shown in shopping kart

Clutch, Fun Kart & Mini-Bike, The SS series is the most popular style clutch used by the O.E.M.
since its introduction in 1970. 10hp max. 3/4" Shaft.

Replacement Sprocket. #219 Chain
Requires 13 T and up drum

For drums see
http://www.nrracing.com/product-p/mtdsurm.htm

Max-Torque Racing Clutch (BSP/Chinese OHV), 3200 rpm engagement, Preferred for Karts. Works well on stock or mild motors. These Max-Torque Clutches clutches are specially built for NR Racing to engage at higher rpms and are stronger than the standard fun kart clutch. The clutch includes a built in clutch key in the drive hub to reduce chances of losing the key or struggling to find one that fits properly. 4 cycle - 3/4" bore - #35 chain, Comes boxed with mounting hardware and instructions.

(10 Tooth, & 18 thru 21Tooth Clutches slightly higher - see price in shopping cart)

Max-Torque Racing Clutch (BSP/Chinese OHV), Green Spring (2800 rpm), Preferred for Mini-Bikes. Works well on stock or mild motors. These Max-Torque Clutches are specially built for NR Racing to engage at higher rpms and are stronger than the standard fun kart clutch. The clutch includes a built in clutch key in the drive hub to reduce chances of losing the key or struggling to find one that fits properly.

(note: 10 & 11 tooth clutches have black springs for slightly higher engagement)

4 cycle - 3/4" bore - #35 chain, Comes boxed with mounting hardware and instructions

(10 Tooth, & 18 thru 21Tooth Clutches slightly higher - see price in shopping cart)

Max-Torque Racing Clutch #219 Chain  (BSP/Chinese OHV), 3200 rpm engagement,