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    Timing an 850 Merc

    When setting the max spark advance screw, the engine is no longer at idle, as the primary carb cam has started to be pushed. Is this correct?
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    Testing Tach

    73 merc 850 thunderbolt. Just hooked the stock tach up and its only reading 3500 rpms. Just got engine and have been fixing slowly. Put in a new trigger from cdi, and I'm doing the timing belt tomorrow. Can I use a dmm with frequency setting to check pulse from engine, (brown wire) to see if...
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    Timing still factory?

    73 merc 850, factory sticker says 27?btdc. Does this still apply with newer fuel? Thanks
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    What coil SHOULD I be using?

    Okay I have a '73 merc 850. Serial 7033648. I am looking at mercury electrical drawings. One is for serials 2991033 and below, serial 3052381 thru 305982 and serial 3307347 and up. The other drawing is for all other serial #s not listed on previous page, which I just listed. So logically I would...
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    Weird merc 850

    Hello all, I'm new here for posting but have been reading quite a bit the last few days. I'm no expert but now that I've registered I'll throw my 2 cents into the mix when I can. Anyways, last week I picked up a 73 Glastron with an 850 merc. Serial # 7033648, and from what I can tell it is a 73...
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