Question about 1972 Aermacchi Sprint 350

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What happened to the free info you offered

Fuel,oil mixture for Aermacchisprint

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  • Graeme Ross
    Graeme Ross May 11, 2010

    I have posted this to your other question regarding same.

    If this is the motorcycle(1972 Aeracchi Sprint) you are intending to use 2 stroke fuel mix for, you should be aware that that model is a 4 stroke. Can you please provide the make, model and year of the moto you need the information on.




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Check out this online chilton aftermarket service manual for all Harley single cylinder bikes.

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What Bendix Scintilla magneto # is the closest to fit if midified for a 250 or 350 1970 and back.

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Hi, Roslyn for this scenario you will need your service/owners/ manual if you can't find the first and best tool you ever bought for your Suzuki, despair not, for a mere zero $ you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Why is my atv fouling out the plug?

The big question is it being fouled with too much fuel or is it an excess of oil?

Excess fuel would initially cause dry soot to form on the insulator until the build-up becomes so severe the carbon begins to short out the spark and then plug wetting will occur. If there is a large amount of excess fuel plug wetting will be almost immediate but this will be obvious due to the inevitable bad running.
If removed it will tend to dry in the free air.

An excess of oil will start to wet the plug almost immediately but the plug won't dry in free air.

Possible causes of excess fuel: leaky carb float valve, carb fuel level too high, mixture maladjusted, blocked air filter...

Possible causes of excess oil: oil level too high, piston rings, valve guides, too much oil in 2-stroke mix, faulty crankcase breather...

A further possibility is the wrong heat grade of spark plug.

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What is the fuel mixture

Are you asking as in oil to fuel, or air to fuel? If oil to fuel I seem to recall that these were oil injected unless the oil injection is failed and you are mixing now or it is a old RM? Please get back with that info and you will get a better answer.

If oil to fuel is the question then 32 to 1 would be good for a newer 2 stroke and if from the 1980's 20 to one. I would be more comfortable if I knew the year before making and certain mix ratio though. You can contact a Suzuki dealer to get the info also... That is if it is not a oil injected model.

Back at one point I recall some 2 stroke with oil injection sprayed the oil so as to increase longevity. Bypassing the injection may not be the best idea although some people, Not Suzuki Techs, state with confidence that bypassing is just fine. While I am a Suzuki trained Tech it has been some years since I worked on them as I went on to Porsche.

I added a link that will answer you if it is about air fuel ratios.
Airfuel ratio Wikipedia the free encyclopedia

Mar 07, 2015 | Suzuki Motorcycles

1 Answer

Blue smoke comes out my exhaust only when choke is on

Blue smoke is usually the result of burning oil. It should not be burning at all, as it shouldn't be entering the combustion chamber or leaking on or in anything in a properly operating "4 stroke" (or 4 cycle) engine. Blue smoke in exhaust is not a normal condition for a properly operating "4 stroke" or "4 cycle" engine.

When the choke is on, the mixture of fuel and air is brought from "Stoichiometric" (about 14.7 parts air to 1 part gasoline or a "14.7:1 ratio") to a more "rich" mixture (about 13:1). This is not the ideal mixture to run, but it makes it easier for the engine to start and stay running until warmed up. When the mixture is rich, is is not uncommon to see black smoke - which happens because of incomplete combustion in the engine. The balance of the combustion happens in the exhaust system, where the energy in the fuel is converted only into heat and zero power. Since there is little air in the system, black smoke is produced. It may even smell of raw gasoline, too.

When running at proper mixture ratios of fuel to air, little if any smoke should be observed in the exhaust gases. It is possible that this small amount of oil being burned is so minute that it is not readily visible under these conditions - but is probably present never the less. You should carefully monitor the engine oil level and keep it filled. Oil leaking in the combustion chamber can indicate a problem that can be expensive to repair.

Two cycle (or two stroke) engines on the other hand, require that the oil and gasoline be premixed in the tank or are blended together "on the fly" and for this reason is not unusual to see blue smoke in the exhaust gases even when unchoked.

I hope this helps & good luck!

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Are you mixing regular motor oil in the fuel? Doesn't this bike have a reservoir for 2-stroke oil? You must use 2-stroke oil in that reservoir. Buy it online if you can't find it locally.

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Bike has a lag when its cold like its something in the motor is in a bid. after 10 miles or so it frees up and runs like its supposed to

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Are you loosing transmission gear oil? I seem to remember an older bike I had with a crank seal issue. Gummed up plug is usually only 2 things:
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2 stroke engine smokes. how do you adjust the fuel/oil mixture?

The thing with two strokes is that they smoke a bit under normal operation, and they smoke like mad if they haven't really been run for a period of time, I would advise you to run it for a while and see if that helps.

You should not need to adjust the mixture settings at all.

Hope this helps

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