 | PM |  | | Quote | | | Reply | | | Full Topic | |
| Joined: | Mon Sep 18th, 2017 |
| Location: | |
| Posts: | 20 |
| Status: |
Offline
|
| Mana: |  |
You did not mention the idle control screw setting in your description of the prep you did to the carb. For that carb, the correct setting for most engines is arrived at by backing the control screw off until it no longer makes contact with the lever on the end of the throttle shaft. Once it is not touching the butterfly seal should be checked to assure the butterfly is not offset. It should fit the bore very close to a perfect seal. If it appears offset... you can see light on one side but not the opposite side.... loosen the butterfly screw and adjust the position to allow it to close completely. With the butterfly centered, turn the idle control screw in until it just makes contact with the lever and then continue turning it one more full turn. Set both mixture screws to 1 turn and fire the engine and warm it up for 60 seconds by opening and closing the throttle quickly in very short but wide open applications. Do not use part throttle to warm it up.... open, close, open, close... keep revs in the 2 to 5K range with no load on the motor ( axle spinning). Once it is warmed up, hold the brake and apply full throttle for three seconds and then let off the brake and throttle together. Have a small screw driver ready to adjust the idle control screw to get it to the desired idle speed.
Do this routine after you have completed all the inspections Terry outlined above to make sure you are not dealing with an air leak, pulse passage restriction or leaking reed valves.
Good luck.
Steve O'Hara
| Close Window | |