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    Merc 500 Thunderbolt timing marks

    Pretty sure I already know the answer, but going to ask since the pictures in the manual I downloaded aren't clear enough to verify. On a 1974 500 with thunderbolt ignition (serial 3817126) , when the flywheel mark is on #1 piston TDC, verified piston is at top, should the second flywheel mark...
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    '74 50hp carb kit help

    I've been searching for a while, and am having a hard time figuring out which carb kit is right for my engine. Serial Number 3817126. Looking at several different sites is only adding to my confusion. One shows a Sierra 18-7013 covering all from 1961-'75, another shows a quicksilver 1395-9262-1...
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    '74 merc 500, water in #4 cylinder

    Tried searching, but not having much luck. Mercury 500 Thunderbolt, serial 3817126. This boat/engine sat up for several years before I purchased it. Compression is OK (120 range on all cylinders). After new wiring harnesses, and plugs, fired right up. With a new impeller I finally got a chance...
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    Mercontrol assembly

    I bought a 1970 Duracraft, with a '74 Merc 50 on it, that had been sitting for 6 years. Of course the engine and boat wiring harnesses were shot, so I just replaced them and I am having a problem putting the controller back together. I downloaded the service manual, but the pictures in it are...
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    Tilt pump/resevoir gasket or seal? More trouble post #7

    The tilt pump on my Chrysler 135 is leaking and -seems-to be where the pump/resevoir meet. Is there a seal or gasket available to fix this? Everything works great as long as I fill it before a trip to the lake, but I really rather just fix the leak. By the look of the lines it looks like someone...
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    Chrysler carb interchange?

    Do most of the -bigger- Chrysler carbs interchange? Recently got a fair deal on an '84 chrysler 90 hp that I intended to use for spare parts to my 135. The PO bought a boat/motor/trailer just to get the trailer since the boat was scrap. Anyway, suposedly one of the carbs had a problem and was...
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    Chrysler 135 exhaust vs. prop

    OK, new to the forum, sort of new to outboards. I recently bought a 1976 Winner Strike with a '74 Chrysler 135. The engine did not come with an exhaust snout so I bought one on ebay. In the meantime, I took the boat out for a test run and it seemed to do alright, although it was a little...
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