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1. 1971 Mercury 9.8 Hp Outboard Owners Manual Free Download
2. Mercury 8 Hp Owners Manual
3. 1971 Mercury 9.8 Hp Outboard Owners Manual

It could be that the mixture adjustment is incorrect, did it run ok? Have you altered anything? Or that the jet is partially blocked. Is fuel getting through Ok or is the filter in dire need of cleaning. I would check for blockages and clean the float chamber and jet(s) before altering any settings. Have you perhaps used some contaminated fuel. While agreeing that fuel can be kept for long periods in the right conditions it can and does deteriorate if not so stored.

I once had some 2stoke oil do something rather nasty after prolonged storage as well. Ne te confundant illegitimi.

Here beginneth the lesson, petrol contains light fractions which when vaporised (thats where the american gas comes from) in a carburettor form with air a combustable mixture. When the engine and surrounding temperature is low it is more difficult to vaporise the petrol to form 'gas'. The choke makes the engine pull more petrol from the main jet thru the emulsion tube and consequently more light fractions that vaporise easily in the low temperature to form a combustible mixture.

As the engine temperature rises less light fractions are needed to vaporise to form a perfect combustible mixture and so you can start easing back on the choke. Now, if you have to use the choke all the time it can mean several things are wrong but only one cause, not enough light fractions, the flow of pertrol thru the carb is being obstructed, i.e a globule of water on the main jet, a blocked main jet, verdigris off said water and brass jet blocking main jet, blocked breather on fuel tank OR stale petrol, light ends have evaporated leaving a not easily vaporised liquid that then requires choke to produce enough lighter ends to combust.

All in all anything that stops enough light ends being present to produce a 'gas' can cause the problem, spark plugs, points, timing do not come into the equation stu. The carb has to mix the right amount of petrol with the right amount of air in order to work efficiently. When the engine is cold it needs rather more petrol, so the choke closes down the air inlet by a precise amount to compensate and enrich the mixture. If the jets which squirt the petrol into the air intake are blocked by gunge, water dirt etc, then the petrol/air mix is too weak to burn properly. If some petrol is getting through, then closing the choke may bring things back into balance sufficiently to run the engine - sort of!

1971 Mercury 9.8 Hp Outboard Owners Manual Free Download

Bad electrics - whether plug, condensor, points, or electronics are faulty will stop the engine dead in its tracks, or cause it to fail to fire properly on every ignition stroke, causing a staccato and jerky misfire which will not be rectified by playing with the choke. Either the spark is strong enough to ignite the petrol air mix, or it is not with the result that the engine dies not fire on that stroke. The next stroke in a marginal spark situation may be just strong enough to do its job so it kicks the engine over for a few strokes before it fails to fire again - producing the familiar irregular stop start running that we all dread.

Mercury 8 Hp Owners Manual

Carb Cleaner is marketed as 'Carburettor cleaner' (Wow!), and is quite effective at removing deposits of gum and gunge. However it does not remove solid particles of dirt, nor will it deal with a seriously gunged up carb. Stubborn cases may need to be soaked overnight - which is difficult as it evaporates quite quickly, so everything has to be enclosed. It does not seem to be stocked by every car shop, so you may have to shop around a bit. Various brands of 'carb cleaner' about, but they won't usually touch the gum or varnish that can block jets/make the hole smaller.

1971 Mercury 9.8 Hp Outboard Owners Manual

A few yrs ago we had an old o/b that someone had let a whole tank/carb' full off petrol evaporate.carb' cleaner didn't touch it, but iso-propyl alcohol certainly did the job, but it probably makes rubber swell up after a bit, so careful if you use it. Regarding poking out jets with wires, done it 100's of times, admittedly with copper or brass wire.

The mercury outboard manual by clymer provides a great reference for service and repair information on your merc boat motor the mercury manual provides maintenance information for 1964 1971 engines with horsepower between 39 135 hp horsepower. 6 8 99 10 15 starting model year 1986 serial number 0a197112 and up usa 09503295 and up belgium propeller information chart 15 hp 1a 7 mercury quicksilver lubricants and sealants 1a 8 outboard weight manual start 6 8 8 sailmate 99 99 sailpower xr mag viking10 sea pro marathon 10 15 sea pro marathon 15 electric. Revise search all models 98 hp find your engine drill down to the horsepower serial number range and engine section to get an online inventory of original and aftermarket mercury boat parts. Thru 1996 mercury did not publish model year information for 1997 newer outboards the year is now normally noted on the serial number sticker.