carol88miller
03.05.2021 7:56:04
Re: 1976 Mercury 85 hp Thunderbolt.
See full version: 1976 Mercury 85 hp Thunderbolt
Re: 1976 Mercury 85 hp Thunderbolt.
Re: 1976 Mercury 85 hp Thunderbolt.
Hi, I'm fairly new to the forum and to outboard engines. I have the exact same engine. I got this boat for free and it would start and run fine with the muffs on it but as soon as I got it in the water it had no power at all and would just die when engaging the prop. My problem is it only runs on the top 2 cylinders. Cleaned the carbs twice to make sure they are good. There's a strong blue spark at the plugs. 140 psi on all cylinders. Only thing i can think of is the reed valves for the lower cylinders because I can turn the idle screw all the way in on the lower carb and it makes no difference. Turn in the screw on the upper carb and it quits. I can stuff a rag in the lower carb and it doesn't affect it at all. Any advice would be awesome. Going to make sure that all of the cylinders are firing in the correct order at the right times. more
Re: 1976 Mercury 85 hp Thunderbolt. [links]
Serial Number: 3226958
Your engine's RPM range is important in choosing the right propeller for a given application. For example, if you look at your tachometer at top speed and it is not within the engine's RPM range then that is generally not good. You want your RPM's to be within the proper range while at wide open throttle (WOT). Be sure to do your testing under your normal boating conditions and with a good propeller (not bent, cracked, or excessively chipped).
The iboats Outboard Motor Forums are another excellent source of information.
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Serial Number: 3263263
Your engine's RPM range is important in choosing the right propeller for a given application. For example, if you look at your tachometer at top speed and it is not within the engine's RPM range then that is generally not good. You want your RPM's to be within the proper range while at wide open throttle (WOT). Be sure to do your testing under your normal boating conditions and with a good propeller (not bent, cracked, or excessively chipped).
The iboats Outboard Motor Forums are another excellent source of information.
Sign up for our Newsletter to Receive
the Latest Deals, News and More. more
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