Specifications

Restrictor Plug Installation for engines 23-45hp Single or V-twin with canister air filter assembly
1. Remove mushroom cap on canister air filter assembly.
2. Install restrictor plug in canister opening.
3. Reinstall mushroom cover and tighten clamp.
4. Start engine and warm up for 1-2 minutes (Please see page 16 for starting
instructions)
5. Move the throttle to fastest position.
6. Check engine speed with applicable tachometer.
7. If engine speed is 3600 rpm no load speed can be increased for more power under load.
8. To increase engine speed adjust throttle cable in order to provide more tension on engine speed
controls.
9. The stop for throttle cable can be adjusted for increased travel.
10. If 3950 rpm is achieved, no further adjustment is required.
11. If 3950 rpm is not obtained the tabs holding the governor spring can be bent to increase
tension.
Note: Never exceed 4000 rpm for no load commercial use equipment
Note: Never exceed 3600 rpm for no load non-commercial use equipment
Note: If you are not sure on how to adjust valves, adjust governors and or anything else pertaining to
basic engine Knowledge Please contact your local Industry certified technician for help.
Note: Concerning engine speeds versus horsepower. In most situations the governor high idle no load
speed is set at the factory recommended level of 3600rpm. In some cases no load speed is set to 3800
+/- 50rpm. The primary reasons for this are:
1. Propane fuel requires higher engine speeds to achieve the same level of performance under
heavy commercial use.
2. Customer or user may believe they have lost power or wheel speed under heavy commercial
use.
3. BTU output of propane is lower than regular gasoline fuel and engine speed can compensate for
that reduction.
4. If you are not sure on how to adjust valves, adjust governors, or anything else pertaining to basic
engine knowledge, please contact your local industry certified technician for help.