Re: 1951 200 question

Posted by Fish'n Jim On 2023/10/17 8:41:32

Couple simple checks;
Fuel pressure - should be below 6 psi.
If fuel rich suspect, tail pipe will get coated in black soot.
Bogging down is usually a lack of fuel. When the throttle opens or the accelerator pump actuates, insufficient fuel flow for the air intake - becomes not flammable and dies. Check the fuel/fuel tank & line, it's been sitting 5 years and may need cleaned/dried out and fresh gas. The old accelerator pumps had leather cup seals and can dry and harden, same with paper gaskets that been soaked in gas/ethanol, so may need a partial carb refurb.
Put a timing light on it, if mark's not moving on accel then the timing advance is not.
The other is a bad vacuum leak, but they usually indicate with a rough idle. "Vacuum idlers" are affected.
Weak spark but less likely. More fuel needs strong spark to ignite.
Obstructions. Sitting and subject to all sorts of things happening. Check air cleaner, intake/exhaust, etc. Mice will nest in eh damnedest places. Once my motor home wouldn't start after winter storage. I was traveling so had it towed to mechanic because I had a trip planned for weekend. I'd had fuel tank issues, so that was suspect. Air cleaner was full of mice nest.