If I understand him, it’s not that the engine won’t slow down, like a linkage issue, when he slows it down it dies. I would think way rich or way lean. The fact that it will idle slower cold than hot makes me think it’s flooding.

OP- can you get a complete carb from someone just to test? If that doesn’t cure it you have serious problem somewhere.

Per my remark #53 on page 6 of this thread. I think it's the simplest thing to do and if it 'works' it would save lot of ghost chasing . No matter how weird it may be.

maybe this will get you fixed up.its not mine,I just happen to see this.

https://boston.craigslist.org/gbs/pt...231585404.html

Just to point out that the listed ad, is NOT a marine carb.

OP posted a pic of his on post #14......

rubber hose betw. the j tubes w/ a cut out in the rubber at the top.

That's what we did on our rockcrawling rigs before EFI! I love old school!

Yes, you are correct. It dies when trying to slow it down. Yes I have another holley I can test and I wish one of the first things I did was try this carb. The boat is now winterized though so that test is going to happen in the spring.

Yea, I have said a couple times in this thread that I have another carb I can test on this motor that I know is working. At the time I thought I could pinpoint what was wrong with the problem carb quicker than I could take the working carb off the other boat and install on this one. Obviously I was wrong.

I am unsure if the cam is stock or not. I will check tonight to see if TDC on the #1 cylinder lines up with the balancer.