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Yep. You're right. I usually use 22/7 for PI, but I meant to use 3.14. That's usually enough digits to get a good calculation. Sorry for my arrogance!!

A crack in the airbox is not your problem. When making carburetor adjustments and fine tuning things, it's usually done with that taken off. I'm guessing the jets are clogged inside the carburetor, but with no real description of symptoms, we're not able to diagnose very well. Crack in airbox...

A lean condition will cause both of those issues. When you "cleaned the carbs", did you soak it overnight and clean out the jets? Did you take it completely apart and did you set the float levels per specs? I've attached a link to a video where the guys shows how to clean the jets. Low speed...

Sorry about my smart a** comment. The guy just joined the group today. Maybe he's struggling to navigate his way to the responses to his post. Sorry new guy!

So what time do you think he's expecting us at his house with our tools?

I love being out on the boat when the sun starts to set. God paints some amazing pictures for us to see!!

I was just curious and asking for an explanation. I guess choking just 2 of the 4 cylinders is just enough to get it started when it's cold, as I mentioned above. I don't remember actually if the smaller holes are on top or bottom, and not sure that that would change my curiosity or the answer...

Here's your wiring diagram for that motor tilt/trim

It still doesn't make sense to me that the top 2 cylinders get 5 times as much air when choked than the lower 2 cylinders do. We're not talking about a slight difference here. I'm just guessing that basically only 2 of the cylinders are actually "being choked" and that should be enough to get...

I'm pretty sure that motor has plastic square relays just like the ones you would find in the fuse box of a car. I'd start by replacing those. Auto parts stores have them pretty cheap. The tilt/trim motor (pump) is just a reversible motor. So the relays are needed to basically reverse the...

I'm wondering if you have had some overheat issues and the rings might have gotten compressed and are seized up. Several low-compression issues have been greatly improved on this forum by running some type of additive designed to free up stuck piston rings, but I can't think of the names of any...

I'm with Roscoe on this one. I'm sure there are some wonderful Force motors out there, but I've worked on a few and they were all a disaster. So, there might be lots of compatible non-running compatible force motors out there. I'd look up the parts you need and then back-search to see what...

I understand that the motor doesn't have an electric fuel pump. The boat has a built in 50 gallon tank and access is very limited. I can get to the sending unit, but that's about it. I'm curious, but not enough to cut the floor out. In my muscle car days, I always removed mechanical fuel...

Yeah, I know the vacuum gauge your talking about. Used to use one all the time on motorcycles and cars. I've just never seen anyone use one on an outboard motor, and I've never had an outboard motor that had the fittings for the vacuum gauges. Maybe yours does.

Have you tested the coil that is working correctly? Is it possible that you were sold a bad coil? Or is the functioning coil testing the same as the new one and the suspected bad one?

I don't know that I've ever seen an outboard motor that has a nipple for connecting a vacuum gauge. Maybe it's because there's nothing on an outboard motor that operates on vacuum.

(1998 S115TLRX)I'm sure I've just never noticed this before, but rebuilding my carbs and while scrubbing and cleaning I just noticed that the holes in the choke butterfly plates have different sizes. On the top carburetor, the holes in the choke plate are abut 1/8" in diameter, but the bottom...

I've also found shop manuals for many outboard motors at my local public library and have used the copier to print the needed pages like tune-up procedures and specs to have on hand when needed.

That factory manual that others have strongly recommended will have that information. I've downloaded factory manuals for every outboard I've ever owned. I think you can download it from the manufacturers website. My Yamaha 115 factory manual gives the starting point for all adjustment...

If you're talking about a vacuum gauge to sync carburetors, you'll have no need for that tool. The "sync" that we describe here is basically making sure your carburetors open at exactly the same time and the same amount. I don't think you'll find any place to hook up the vacuum lines on your...