70's Chrysler 45 HP motor with Tillotson Carb - How do I tune the carb?

[Knac]

I have a 70's Chrysler 45 HP motor with Tillotson Carb. Its the kind that has a bowl on the bottom. How do I tune the carb on it? I can't seem to find the screws to turn.

 

[Nordin]

The only tuning you can do is setting the fuel/air mixture. The screw is located above the air intake (12 a`clock).
It should be set 1-1 1/2 turn out of sligtly seated. Do not set it less then 1 turn out, it might end up with melted pistons.

 

[jerryjerry05]

Read the first few posts in the Force Forum.
​It covers carb setup and a bunch of other things.
GOOD reading.

The 1 and 1/2 turns out are for initial adjustment.
Final adjustment is done in the water and in gear and motor warm.

 

[Knac]

OK I found it. That's great. Thanks a bunch.

The bowl on the carb came off. I put it back on with all the seals etc... how tight should I make the bolt on the bottom?

 

[Nordin]

Not to tight, just to make the seal to seal.

 

[wickware]

I have a 1970 35 HP Chrysler which should be basically the same as your 45 except for Piston?s bore and stroke. The carb adjustment is so simple that the problem is usually someplace else. What are your symptoms as problems and when did they start?

Plus, give some history of the unit. Such as: Fire, Fuel and Compression have all checked out to be good.
1. Fire is a good blue spark?
2. Fuel is treated for ethanol or stored dry?
3. Compression, checked out at least 100 PSI in both cylinders and not over 10 PSI apart.

Since my 1984 purchase, the problem came from checking my points and adding too much oil to the oil wics. When the engine showed as sluggish or hesitating the points were dirty. The oil vapor on the ignition system finally got my attention. Initially I felt a crankcase seal was bad. W/O adding oil to the wics. A hard 10 mi run showed my oil in the wicks caused the vapor to affect my points. No problems since with less oil.