The spark plug on my 2005 Honda 400EX keeps fouling up. I am the only rider on it and I do not choke it to start it, and I do not ride it in 4th gear going 10 mph either. I clean the air filter regularly and it is bone stock, no mods at all. It seems to be getting worse as it will hardly idle. Any help would be greatly appreciated.
2007-05-18 14:25:37 · 8 answers · asked by Anonymous in Cars & Transportation ➔ Motorcycles
The seal in the chock could be leaking causing the plug to foul.Plus what ever Guardrail says.
2007-05-18 17:10:18 · answer #1 · answered by (A) 7 · 0⤊ 0⤋
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RE:
05 Honda 400EX spark plug fouling?
The spark plug on my 2005 Honda 400EX keeps fouling up. I am the only rider on it and I do not choke it to start it, and I do not ride it in 4th gear going 10 mph either. I clean the air filter regularly and it is bone stock, no mods at all. It seems to be getting worse as it will hardly idle. ...
2015-08-07 23:16:52 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Could be a couple of things. Try replacing the plug. Do you see any lines down the outside of the spark plug? This is carbon tracking which is build up of carbon in small cracks in the plug. These cracks break down the insulation of the porcelein and allow some spark power to travel down the outside instead of the inside causing incomplete combustion which causes fouling. Could be your coil (the bit that the high tension lead to the spark plug comes from) is on the way out. Could be contaminated fuel..
Good luck :-)
2007-05-18 14:38:06 · answer #3 · answered by bronzeAussie 1 · 0⤊ 0⤋
Make sure the air filter is clean. The bike is almost 20 years old. If the top end (piston, rings, cyl) hasn't been rebuilt, then it's time. 2 strokes are meant to be rode WFO (wide f'n open) before shifting gears. Otherwise the oil won't get fully burnt and foul the spark plug.
2016-03-22 19:39:36 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Try adjusting the valves.
If they are tight and not sealing, the fuel wouldn't get fully ignited and foul the plug.
2007-05-18 15:29:32 · answer #5 · answered by guardrailjim 7 · 2⤊ 0⤋
fouled can mean diffrent things, if its wet get a hotter plug. if its burnt try a cooler one
2007-05-18 14:30:10 · answer #6 · answered by Anonymous · 0⤊ 0⤋
try a new plug with the correct gap if that doesnt work then you need to have coil and charging system checked
2007-05-18 14:28:53 · answer #7 · answered by wonderboy n 5 · 0⤊ 0⤋
Drain the gas and fill with fresh.The gas has collected water
2007-05-21 01:33:44 · answer #8 · answered by Billy T 6 · 0⤊ 1⤋
Do you ever do reguler oil change maintenance?
2007-05-18 15:04:43 · answer #9 · answered by gdwrnch40 6 · 0⤊ 1⤋