1973 50 Mercury Thunderbolt 500 Serial # 3722026
I am in desperate need of 2 idle tubes for this motor. The part is no longer available that I can find and even looking on the parts lists, it shows it in the exploded view of the carb, but doesn't list it in the parts below. Here's the link to...
I ordered and installed what I thought was the OEM carb kit for my '73 Merc 500. The Quicksilver kits I used were 1399-4218. It was almost completely wrong. Gaskets, idle needle, jets, float needle/seat etc... Can anyone help me figure out the actual OEM kit number please? The one previously...
Going to be adding a Garmin Echo 200 to my rig fairly soon here and I was wondering where the best spot to put the transducer would be.
There is already an old bracket from a previous one, but it won't work with the Garmin. I was thinking I'd put it in the same spot only lower so that it's...
Re: 1973 Mercury Thunderbolt 500 50hp no power and horrible fuel economy!
Just took a couple photos quick because I believe I seen the mechanical stop you spoke of and it's a good 1/4 to 1/2 inch + from touching it at WOT. Let me apologize right away for the photos. I don't want to start taking...
Re: 1973 Mercury Thunderbolt 500 50hp no power and horrible fuel economy!
Thanks guys! I didn't get notified of any additional responses after Oldmans. I'll definitely keep an eye on the water as it's a brand spankin' new size 29. Don't really want to fry it anytime soon! I'm planning to get a...
I posted this question within one of my other threads, but it must have gotten overlooked.
My Motor: 1973 50hp Mercury Thunderbolt 500
My Serial: 3722026
This is a manual I found online, , so I haven't purchased it yet, but I'm wondering if it is the full OEM manual I need for anything I have...
Re: 1973 Mercury Thunderbolt 500 50hp no power and horrible fuel economy!
It does scream quite loud when trying to get on plane there's no doubt there! After I'm planed out it sounds like I imagine it should at the speed I'm moving. I'll check with the "Prop Dept." and get their input...
Re: Mercontrol ignition key switch ID help with Pics!
Thanks for the info guys! I got it back together, still with the old switch, but I least I know how to do it now. Just waiting on the new one to arrive.
Silvertip, the switch that I have currently installed has 5 terminals.
Below are a...
Hello all,
Just wondering if someone can help me figure out how to get a replacement ignition switch and key for my mercontrol or better yet, a part number so I can shop around and not waste too much of everybody else's time...
The guy before the guy I bought the boat from lost his key and...
Re: Tri-Hull Club...Yes? No? Maybe?
I'm in! '79 Glassmaster Bassmate IV. Better pics to come after it leaves the garage. Waiting on a float bowl cover for the Merc 500.
Re: 1973 Mercury 500EL Thunderbolt 50 hp no power and horrible fuel economy!
Re: 1973 Mercury 500EL Thunderbolt 50 hp no power and horrible fuel economy!
Thanks ckangaroo70! I will try that idea next, but first...
I'm in a bit of a pickle (as they say)...
This (pic below) broke when I was...
It's the 'T' fitting that connects the upper and lower carbs on a '73 Thunderbolt 500 together. I'm looking for the horizontal one to be threaded (like pic) and the two vertical to be barbed... I'm not sure if there is a specific name for this type which could be why I'm unable to find one...
Re: 1973 Mercury 500EL Thunderbolt 50hp issues?!?
Re: 1973 Mercury 500EL Thunderbolt 50hp issues?!?
I got all the hoses off and am about to run and get new fittings and hoses. Below is a photo with all the lines off. There are two plastic white fittings as seen in the photo that are somewhat...
Re: 1973 Mercury 500EL Thunderbolt 50hp issues?!?
Re: 1973 Mercury 500EL Thunderbolt 50hp issues?!?
I noticed that these hoses are pretty brittle and one them is actually missing the rubber that surrounds the fabric liner. Whether this is part of the issue or not, is there a replacement kit...
Hi all!
Just got my first Merc motor ever, it's a 1973 500EL Thunderbolt 50hp. I have it on the back of a 14' Glassmaster Bassmate IV. Dry weight of the boat is approx. 650 lbs.
Took it out for the first time today, total of 2 adults and 1 kid, approx total people weight 550 lbs. It would not...
