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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.
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.
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 startand 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.
you have fuel burning in the pipe (unburnt in the cylinder and a leak in exhaust) or an incredibly lean mixture resulting in high exhaust temperature, would recommend that you 1st make your air fuel mix richer (worst that happens is foul plug) both in high and low speed mixture. This situation just happened to me after I started my 2003 polaris predator 500 after it had sat for almost three years. I managed to clear the varnish in the carb by cheating (not the recommended procedure but it worked) by draining fuel tank adding new fuel and stabil brand fuel stabilizer (it seems to help with old fuel and old suel deposits as well) and pulling air cleaner so that I could choke carb by hand and force a fuel draw. When she 1st fired up and I pushed the choke in I got a shock when I looked at the pipes and they were glowing cherry red. I began to fear for the safety of the exhaust valves and forced it to run in a very choked condition until the carb cleaned up a bit and it started to run rich and I could push the carb in a bit. hope this helps you out a bit, feel free to call me if I can be of further service 928-580-2298 Sean
What weight oil are you running in your bike? Years ago when we ran the straight 60 weight oil, on a cold morning you had a time kick starting the bike. Another thing is that when your bike is cold, it requires a much richer mixture to run. Whether your bike is fuel injected or carburated, you're running a very rich mixture. The fuel system control or the enricher provides the rich mixture and a rich mixture will make the bike run sluggishly.
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:
1) Carb too rich. Check jetting or sticky float needle valve that will dump fuel into the intake manifold.
2) Too much oil (check mixture ratio or crank seals that is mixing crankcase oil with the fuel mixture). Either of these two oil issues should produce a massive amount of tailpipe smoking and a noticable drop in power.
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.