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  1. Zenvalo

    Thunderbolt 500 Idle Tubes

    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...
  2. Zenvalo

    Sierra 18-7013 > Quicksilver OEM carb kit number

    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...
  3. Zenvalo

    Transducer Location? - With Photo!

    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...
  4. Zenvalo

    Is this the correct OEM manual for my motor?

    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...
  5. Zenvalo

    Mercontrol ignition key switch ID help with Pics!

    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...
  6. Zenvalo

    ***Solved*** Where can I find this threaded 'T' hose fitting?

    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...
  7. Zenvalo

    1973 Mercury Thunderbolt 500 50hp no power and horrible fuel economy!

    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...
  8. Zenvalo

    Looking for more info on my "Little Hooker"!

    Hey all! Been a member for a while but haven't had a question for a while, so here goes... I'm trying to find out info on my lil' 14 footer, specifically weight, but year, make and model would be nice too. The details I can give you about it are minimal, but let me know what you think. It...
  9. Zenvalo

    HELP!! cavitation plate???

    Hello all! Fairly new to iBoats, but I know that you all are some of the best to ask about anything boating, so I hope you can help. I have a '71 Sportwin 9.5 (not that important pertaining to my question) It starts and runs great. I bought it with a piece broken off of the cavitation plate...
  10. Zenvalo

    1985 Evinrude 40HP VRO

    Hello, new to the forum... I want to install a standard fuel pump (OEM part #438556 or Sierra part#18-7352) in place of my VRO. From everything I've gathered in these forums I should be able to do a direct replacement. Is there anybody out there that can give me detailed yet simple...
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