ADJUSTING HIGH SPEED

[davemcgarvey]

My highspeed knob is turned off all the way on 40 johnson,,,I dont know much about it,,,and when I hit full throttle, it crawls 2 miles an hour.<br />MY QUESTION,,,,anyone know aprx. how many turns to turn the knob for adjusting the high speed.<br />I know to go in the water and play around with it,,but I just need somewhere to start.

 

[Joe Reeves]

Re: ADJUSTING HIGH SPEED

(Carburetor Adjustments - Two Adjustable N/Vs) <br />(J. Reeves)<br /><br />Initial settings are: Bottom high speed = seat gently, then open 1 turn out. Top slow speed = seat gently, then open 1-1/2 turns. <br /><br />Setting the high and low needle valves properly:<br /><br />NOTE: For engines that DO NOT have a shift selection, obviously there is no NEUTRAL position. Simply lower the rpms to the lowest setting to obtain the low speed needle va /lve adjustment.<br /><br />(High Speed) Start engine (it will run pretty rough), shift into forward gear, take up to full throttle. In segments of 1/8 turn, wating for the engine to respond between turns, start turning in the bottom high speed needle valve. You'll reach a point whereas the engine will either start to die out or spit back (sounds like a mild backfire). At that point, back out the needle valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest setting. <br /><br />(Low Speed) Slow the engine down to where it just stays running. Shift into neutral. Again in segments of 1/8 turns, start to turn the top needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back. Again, at that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting. <br /><br />When you have finished the above adjustments, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

 

[davemcgarvey]

Re: ADJUSTING HIGH SPEED

Awsome,,,heading to the lake in about an hour,,,,,thank you VERY VERY MUCH,,,,I am a new boater and was disappointed that the boat only went 2 miles an hour LOL,,,I will try that and post tomorrow,,,,,,THANKS AGAIN.

 

[davemcgarvey]

Re: ADJUSTING HIGH SPEED

Oh and Jim,,,there is NEUTRAL position.

 

[davemcgarvey]

Re: ADJUSTING HIGH SPEED

So If I understand this,,,seat it start it and then turn 1 1/2 turns out,,then go up and down the lake 1/8 of a turn till I find high speed.<br />Or...seat it,turn 1 1/2 turns,start it and out I go LOL

 

[BoatBuoy]

Re: ADJUSTING HIGH SPEED

seat it,turn 1 1/2 turns,start it