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Thanks for the tips so far all and I apologize for potentially killing an exceedingly rare piece of the Chrysler OB family, all in pure rookie haste. Lesson learned. I haven't been able to find replacements for the main nozzle or the tube...all websites I've searched show them as no longer...

Wellll....I already removed it assuming something was wrong with it since it wasn't cylindrical at the bottom (looked half shut). Now it's completely squeezed shut, of course. I removed the main nozzle to get a good look at it and pretty much as soon as I started turning the flathead screwdriver...

I pulled the carb (tillotson co-10b) off. The only thing I wasn't sure about was what the diagram calls a bypass tube (merc/ quik # FO15522). It seemed odd to me...the bottom end was squeezed half shut and the top end extended past and was more or less squeezed against the narrow diameter end of...

Ok ill probably start with the carb clean and then leak down check since I can do that without firing it. What is the proper procedure for leak down on these engines and what result should I be looking for?

Picked up a 70s Chrysler 15hp ob engine. Smokes heavy at idle and runs rough in low range and skips mid range to run like heavy open throttle if i roll into the throttle to keep it running. It's either running rough at low range or tries to take off...no nice transition between the two. Where...