Carburator is to rich

Could be fuel or oil fouling. Need to determine which first off. If it is black sooty fouling it is likely too rich also it too rich may be wet.

If oil fouling it is more likely to be much more material fouling and wet sticky material.

A wet, black and shiny deposit on plug base, electrodes and ceramic insulator tip indicates an oil fouled plug. The condition may be caused by one or more of the following: worn pistons, worn piston rings, worn valves, worn valve guides, worn valve seals, a weak battery or a faulty ignition system.

A dry, fluffy or sooty black deposit indicates an air/fuel mixture that is too rich, engine idling for excessive periods of time and/or enrichener usage for excessive periods of time.

A light brown, glassy deposit indicates an overheated plug. This condition may be accompanied by cracks in the insulator or by erosion of the electrodes and is caused by an air-fuel mixture that is too lean, a hot-running engine, valves not seating or improper ignition timing. The glassy deposit on the spark plug is a conductor when hot and may cause high-speed misfiring. A plug with eroded electrodes, heavy deposits or a cracked insulator must be replaced.

A plug with a white, yellow, tan or rusty brown powdery deposit indicates balanced combustion. Clean off spark plug deposits at regular intervals.

Weak Spark, worn piston rings(Burning oil/compression issues), lack of compression, wrong spark plugs, incorrect spark plug gap, engine not reaching operating temperature (Due to short use), carb. is running rich (May need adjusting), dirty air filter (Causing carb. to choke and run rich). Bad gas
All these symptoms could lead up to fouling plugs.
Hope This Helps.

Check your plugs to see if the bike is running lean or rich and adjust accordingly. White plugs mean the bike is running lean and black sooty looking plugs mean rich.

Hello bragg, sounds like you either have a vacuum leak and/or a fuel delivery problem. If you can plug the plugs and check the condition it will help to determine which cylinder and carb is causing the problem. The pilot jet may be clogged, causing you to have use the choke. If the spark plug is a greyish or light brown color, that would indicate a lean fuel mixture. Black would be rich and fouling. Also check for vacuum leaks around the carb mounts...let me know what you find.
I hope this helps.

the factory does have a sort of filter that they install on the fuel petcock( on/off fuel switch mounted under tank) but it is a screen( usually plastic) you have to take the 2 screws off and remove the on/off switch to get to it( drain fuel first)......but they hardly ever get clogged!!!! you can check,but i dont think thats your problem...sounds to me like your either running to rich or to lean which will be a carb issue.... do you foul plugs allot?or get a black oily residue leaking from exhaust?( to rich or to much fuel to engine from carb ) if not then sounds like its running to lean.( not enough fuel) ( rich or lean will cause it to bog when hammering on throtle..) if your running lean i would remove carb and clean with carb cleaner( might have a partially pluged jet in the carb.......

if it has a carb and is a two stroke check the gap on your spark plug and make sure your main jet is adjusted right. but it sounds like your sled is running to rich. look at the end of your spark plug, if it is black you are running to rick but if it is kind of a white color it is to lean. it should be pretty close to tan.

Hi Chris,
You will have to recheck the float level (in the float chamber) of those two carburators, reset if necessary.
You may also have to reset the air-mixture screw for both of those carbs. Standard procedure to set htem is tighten them all the way in making sure not to over tighten to avoid damaging the sharp end of the screw, and thn to open 2 and a half to 3 turns.
You can thn reset them as the engine is running + -- either way.
Hope this helps!

Your bike may be jetted too lean. A common problem in these days of overzealous EPA regulations. You can tell if when you've cranked your throttle wide open and it splutters, if you back off on the throttle about 1/8 to 1/4 turn, it clears up. This is indicating that it is jetted too lean. When you close the throttle slightly, the fuel is being metered by the main jet and by backing off on the throttle a bit, you're cutting back on the air, thereby bringing the mixture closer to what the engine needs. Try rejetting the carb, Go up one or two sizes on the main jet, one step at the time.

Now, it could be too rich as well. If it splutters and blows black smoke out the exhaust, it either jetted too rich or the float level in the carb is set wrong.

Take care of the simple stuff first before rejetting the carb. Make sure your spark plugs are the correct ones and they are not fouled from overusage of the choke or enricher. If you allow the bike to "warm up" with the enricher on, plug fouling is common with this practice. I get the bike started and as soon as it will run without the enricher or choke on, I turn it off and keep the bike running with the throttle. Don't foul as many plugs that way.

Re-jetting refers to changing the size of the jet (or jets) within the carb. The jets, for the most part, determine the air/fuel ratio entering the engine, Too small of jets the engine will run lean, run hot and may lack top-end power. Too rich and the engine may have low-end running problems, produce a bit of black smoke, waste fuel and may even foul the spark plug(s). Looking at your spark plugs can give you great in-site as to how the engine is running, rich, lean, burning oil...)
Please see the attached link for your use.

http://www.spark-plugs.co.uk/pages/technical/diagnosis.htm

If you do need to replace the jets you'll need to remove the carb(s) and tear in to them abit; the jets themselves just screw in and out. Take care when handling, their brass and can be damaged easily.

I hope this may have assited you,
Tom

so I think I could guess my way through it mechanicly but how do I know where to stop. My eikon 150 running rich currently (black dirty spark plugs) and I would like to lean it out properly but I'd much rather have a too rich bike fouling spark plugs than a too lean bike fouling engines. So how do I adjust it properly and how do I know when it's right? Hey Kit. Are the plugs oily, or are you getting white smoke out the pipes? Well, you may already know these symptoms might indicate another issue besides fuel mix. \Anyway, rich mixes don't make much power. You'll be surprised how quick your bike is when you get the mix leaned out a bit. First of all, I'd make sure the float levels are set correctly and that the float valves are indeed seating. If they don't close off the fuel flow tightly you'll get raw fuel dumping into the carb bores... not good. Also make sure the air filter is clean and there is absolutely no obstruction to air flow. If there are problems with either of these, nothing else you do will matter much. BTW,you'll know you're there when you get a tan or light brown color on your plugs.,,,