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  1. W

    Mercury XS850 vs. 850

    Hi there, I have received my new Carb, cleaned it, fitted it, .. engine starts at once with a nice sound but loads of 2T smoke but no idle possible. Playing after the book about timing.. motor is dead and flooded immediately. Fountains of fuel inside the carb.. at starting only, not if it...
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    Mercarb Carburetors

    In comparison the top Carb
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    Mercarb Carburetors

    Hi Jeff, I am talking about the tiny hole on the right side inside, just on top of the black plastic venturi On the top carb there is a brass `jet´ pressed in here. This hole communicates obviously with the idle screw but apparently also with the choke/enrichment, so it should matter
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    General Specifications

    Hello there, I have 2 old Merc´s, one short shaft ´86 50HP and a 850Merc 4 cyl from 1976, which I just try to figure out if it really is an XS as it says it wants to be.. Via this forum I have solved some serious issues already, -Thanks to everybody! These motors invite to many discussions also...
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    Synthetic 2-stroke oil

    Hi there, Some short while ago I posted a thread,that due to constantly only using synthetic 2-stroke oil I have reduced the mix ratio on my ´86 50Hp 4cyl Mercury to 75:1. It was running perfectly and actually better than ever all through this and the last season.. until this morning.. I was...
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    Mercarb Carburetors

    Hello there, on my `76 850Mercury is one of the Carburettors, the bottom one, heavily worn. Somebody used aggressive tools to clean the low idle/choke system. I have tried to order a replacement, a 2nd hand one in good condition, which carried the ID code 6071 A11 Permanent problems with the...
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    Mercury XS850

    Hi there, I accepted the challenge to install on my vintage 13´ Hannibal Deep-V Racer the old original motor it used to be challenging with sometimes. I acquired now an XS850, which was originally installed on the boat in the 70´s. This motor has experienced some changes during time, so it has...
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    Positive mixture experiment

    Hi there, I live in Greece and run currently a `86 50Hp Mercury behind my classic 13´ Hannibal Deep-V Racing Boat. Currently I am in the process to fit the old proper XS850.., but that is a different thread in the near future. For 2 seasons and many engine hours I ran the 50Hp motor now with...
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