74 Chrysler 45 hp Idle issue.

[73Glasspar]

Hey,

As you can see....... Im new to this forum. I am hoping to seek a little help. I have owned this boat/motor for just a few days now. The issue I am having is..... the motor seems to not want to stay at a good Idle speed. She runs rough and dies out. I have pretty much eliminated that it is an electrical issue. I popped off the flywheel and set the points at.020.... and gapped my plugs at .030. I checked all wiring and all seems to be good. I am running a tilly carb and when at full throttle.....nice and steady but, at an idle she is rough. This carb has NO low or high settings. I do not have the Boat in the water. Just ran with a set of muff's so far. Seriously want to get this issue resolved. Any help would be greatly appreciated.

Thank you for you time and knowledge. I do understand what it means to help another. As I ran a vintage snowmobile site for the last 10 years.

Dave.

 

[jerryjerry05]

Re: 74 Chrysler 45 hp Idle issue.

On the front top of the carb is the air screw.It should be turned out 1 and 1/8 turn out.Then adjust from there.If you get no response from that.
The carb's probably full of crap.The main jet has small holes in it and they control the idle/low speed,these holes must be clear.
Ethanol is messing up a lot of motors.It's delaminating the inside of older hoses causing clogs in the carbs and fuel filter.Check for soft hoses and junk in the filter on the motor.Check the diaphram J

 

[73Glasspar]

Re: 74 Chrysler 45 hp Idle issue.

Thank you for you reply Jerry. I will look for that screw. Let you know how I make out when I get back from Rushford lake on Tuesday.

Dave.

 

[73Glasspar]

Re: 74 Chrysler 45 hp Idle issue.

Found my problem. The diaphragm on the fuel pump is shot. Picked up a new one and we are ready to rock ! I did rebuild the carb while I was at it. Cant hurt any.... ya know?