Put an end to recoil starter headaches and add one-hand starting ease by installing the Kwik-Pit Super Start System from DuraTrax on your model. This version will convert recoil equipped O.S. brand .12 to .21 and DuraTrax Torq .12-.16 engines. **Does not fit on the O.S. 18TZ**** FEATURES: Easy one-hand starting means the end of blisters and broken recoil ropes Powerful twin 540 motors are powered by twin 6-cell sub-C stick battery packs (not included) Unit will not operate on only one pack Steel gear drive Dust and impact resistant composite plastic case Hinged access door provides for easy battery installation ON/OFF rocker switch with safety side guards Twin ball bearing-supported gear drive Two clips on the unit"s bottom for storage of starting shaft INCLUDES: One Kwik-Pit Super Start power unit One front and rear gear case - key number 23 One 32 tooth steel, adapter gear - key number 16 One 11 tooth steel, small adapter gear - key number 12 (DTXP6045) Four 2.6x10mm hex head screws - key number 25 (DTXQ0283) (requires a 2mm allen wrench for installation - DTXR0252) REQUIRES: The stock engine back plate and one way bearing Two 6-cell sub-C batteries and charger - DTXP4600 or modeler"s choice Installation following included instructions sheet Starting Unit Starting Shaft SPECS: Length: 10" (254mm) 7.25" (185mm) Width: 2.1" (53mm) NA Height: 4" (101mm)_ NA Diameter: NA .21" (5.4mm) COMMENTS: For the O.S. 18TZ, use coverplate (OSMG8984) and Kwik-Pit plate (DTXP6026) kpm12/29/2004 ir/jxs