Re: 40hp Johnson 1963 Carb Question

[twsnagel]

Hi Fleetwin (any anyone else who might help!):
I have a strong spark. It’s bright blue. It easily jumps 1/4". I’ve put new plugs in.

I haven’t attempted to remove the flywheel since I’ve got the strong spark.

BUT… I think I may have found the problem. I believe the high speed orifice may be missing from the bottom of the carburetor bowl.

It is part number 69 on the diagram that I posted on the top of the thread on page 1. OMC part number 309935 replaced by 319534.

It is VERY hard to look down into the threaded passage, but the passage seems "too deep" to have such a jet in it. Before I hit the end of the threads, I can push 15mm of rod into the hole until it hits the end of the threads.

I can’t seat a "no flare" screwdriver of the right width in the bottom of the passage, it just turns round. It might catch a bit, but nothing positive.

Going against this theory is that I can measure the orifice size that goes into the centre of the carb bowl by *cautiously* putting the shank of small phillips-head screwdrivers into the bottom of the carb bowl. It is between 1 and 2 mm in diameter. This would match the "correct" orifice size of .067 in.

So, I guess there are two options. 1) The high speed jet is missing. 2) It is there, but the slot is messed up.

Would someone be able to measure the amount of thread there is in their carb before you hit the "end" of the threads? It should be possible to do this without taking the carb off the engine.

It missing would certainly explain why the carb is dumping WAY too much gas into the engine.

Thanks in advance,
Tyler