Shaft Couplings & Clutches

to Connect the YG Engine PTO Taper Shaft

to the PSRU drive

GTF 

Taper-bore flange hub and Rubber Flex-Shaft Coupling. ELIMINTES CLUTCH.  For use with YG4 engines with AK7, SPG, and SPG4 gearboxes.  With threaded end for easy removal using the MAC "Big Ass Bolt" (BAB).

  

$499.00

$450.00 with AK7 purchase

GTF-R

GTF with adapter for smaller Rotax C/E drive shaft flange (shown in photo attached to adapter); for use with YG4 engines with Rotax C & E, and Simonini C gearboxes.

  

$595.00

Compare the rubber elements at right, the top is Rotax, the bottom is MAC.  Do not attempt to use Rotax with YG4, it will not hold up longer than 10 hrs.

RK400

MAC is an authorized dealer for these wonderful centrifugal clutches, and parts, and always keeps several in stock at all times.  Prop is not rotating until PTO shaft speed reaches ~2300 RPM, so these a great on air boats, flying boats and float planes.  Requires Rotax spacer washer for installation, not included.  Requires gear puller for removal.  Made stock for Rotax C/E, MAC machining available for AK7/SPG4/SPG3M. 

$550.00

GT4

GT4

Heavy duty roller ramp one-way clutch allows the prop to continue moving forward at start up, eliminating rough starts.  Unlike a centrifugal clutches, the prop is always rotating while the engine is turning.  A start-up clutch is required for all YG2 and YG3 engines; on YG4 it is optional.  Threaded hub for easy removal with MAC BAB tool. 

Fits all popular gearboxes, including Simonini C.

$695.00

GT5

Self-supported sprag one-way clutch allows the prop to continue moving forward at start up, eliminating rough starts.  Unlike a centrifugal clutches, the prop is always rotating while the engine is turning.  A start-up clutch is required for all YG2 and YG3 engines; on YG4 it is optional.  Threaded hub for easy removal with MAC BAB tool.

Fits all popular gearboxes, including Simonin C.   

$595.00

TangoGyro

Russian RK400 knock-off.  See "RK400", above, for internal structure design. 

$950.00

GT4 Roller Ramp Element  

GT5 Sprag Element