The Burris 520 series 4 cycle jackshaft unit allows for an extremely broad range of gearing and installation options. If you are in need of a low gear ratio for short tracks, the jackshaft unit will allow you to use clutch drivers that still utilize the bearing (14T +) and rear sprockets that allow for ground clearance, yet still get ratios about as low as you would want to go.
For Karts the most popular base plate type is the "R" type rear mounted block and we also have the option of an “F” type that moves the shaft block to the front of the engine which can be used on Quarter Midgets so that the drive is not directly over the axle.
Using a Burris chassis plate (not included) allows the engine to be moved to the right to get more clearance between the clutch and seat or seat strut. You must purchase a Burris chassis plate if you do not already have one. 5 degree = BMC 592 (American) or BMC 593 (International), 15 degree = 540 (American) or 541 (International)
SE type – The SE (single end) type retains the inside drive location of the rear sprocket. This is the most common type and is mainly used for arena and short track oval racing that require low final drive ratios.
DE type – The DE (double end) type allows for the primary drive to be inside while the output drive is moved to move to the outboard location to use a 2 cycle style rear sprocket location. This is a great set up when using a 2 cycle style chassis that may have cross member to sprocket clearance issues such as you would find on some sprint chassis.
CE type – The CE (clutch end) type allows for the clutch to be mounted on one end of the shaft (removing it from the crankshaft) and moves the secondary drive location to the outboard position. Great for Mini-Sprint type applications that have the engine on the left.
Make sure to select the proper options when ordering (block location, gear sets and shaft type) Typical Karting applications will utilize the 24T primary gear with the 28T primary being more likely for Quarter Midgets applications.
Click on the link above for the interactive gear ratio chart:
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