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Mini Bike Jack Shaft Systems, Performance Engines, Adjustable Motor Mounts
Mini Bike Performance Exhaust Headers, Honda GX200 and Clone Engine Performance Parts
Baja Doodlebug and Motovox Minibike Engine Swap Kits
Baja and Motovox Mini Bike performance Parts Specialist
ProMod Jackshaft Kit
Fix your poor performing Baja Mini Bike!
The PMR bolt on Jackshaft Kit is an easy to install performance upgrade for
the Baja Motorsports Mini bikes, Motovox MBX10 Mini Bikes
and other Kart and Mini Bike projects.
Sturdy lightweight CNC Aluminum construction with double bearing housing.
DirtBug and DoodleBug and Motovox Mini Bikes suffer badly from
not having a gear reduction system .
Installing this kit and adjusting the throttle stop screw will result in surprising
performance gains. Great mod for kids and adults alike.
Watch Video! Click
Complete Kit for stock 97cc engine comes with with chain,
hardware and directions supplied for a bolt on
installation retaining all factory chain safety guards
.
Fits New or Original style DB stock 97cc 2.8hp engine
Original model has metal fenders and straight top frame rails
$119.95
Original style
New model has plastic fenders and bend in top frame rails
$119.95
New Style
PMR Performance Jackshaft for 4-6.5hp engines
Offers easy gear ratio adjustments
Shown with 13t-15t combo. Input and output Sprockets which can be
easily switched from high torque 6.73-1 ratio to high speed 5.03 -1 ratio.
Jackshaft plate bolts to most any engine with the standard 2.5 inch
engine PTO side cover bolt spacing.
This system has been tested on Karts and highly modified engines with 15- 20+ HP !
Optional custom gearing available at your request!
Supplied with Jackplate assembly ,Clutch spacer and mounting hardware
Note! Chains not included
Jackshaft system can also be used with PMR Clutch Cover.
$99.95
10ft #35 Chain
$20.95
#35 Master Links
$1.99
#35 Master links
PMR Clutch cover
Laser cut and tig welded Aluminum Cover
offers great protection from chain or clutch failure.
Covers supplied with New Mount,
Quick release Dzus fasteners
and hardware.
$44.95
This cover can also be used with performance disc style racing clutches.
Note# spacing out the mount with a few washers may be required with certain disc clutches.
Baja Warrior, Heat ,MB165 -200
Mini Bike replacement Jackshaft
Quailty JS system to replace problematic factory system
Can be ordered with optional #35 chain primary
for a smoother operation with less drag and chain noise
#35 chain clutch required for this option
PMR clutch cover also works great with this JS System !
Jackshaft Kit for Baja Heat and Warrior
MB165 and 200 Mini Bikes.
Complete with mounting hardware
Note! Chain not included
$99.95
MB165-200 #40-41 17t Primary and 10t output sprockets
Optional upgrade with #35 20t Primary sprocket and #41 10t output for MB165-200
12t #35 3/4 clutch recomended for this application
Clutches
