A lot of smoke from the front cylinder exhaust on my marauder 800 from 1998 ? Why

Sounds like a blown head gasket.
The white smoke is steam from the leaking cylinder

Yes this is correct, you can get important information from the colour of smoke from the exhaust:

Blue/Gray Smoke: Blue/gray exhaust smoke is an indication of oil burning in the combustion chamber. These are possible symptoms and causes:
Valve Seals: Leaking valve seals will cause blue/gray smoke at startup because oil leaks past the seals into the cylinder after the engine shuts down.
Valve Guides: Excessive clearance between the valve stem and the valve guide allows oil to leak past the gap into the cylinder.
Piston Rings: Worn or damaged piston rings will cause blow-by resulting in blue/gray smoke.
Worn Cylinder Walls: Worn cylinder walls cause blow-by resulting in blue/gray smoke.
PCV System: A stuck closed PCV valve will cause excessive crankcase pressure resulting in blue/gray smoke.
Black Smoke: Black exhaust smoke is an indication of a rich fuel condition. These are possible causes:
Fuel Injectors: A leaking or dripping fuel injector will cause a rich fuel condition.
Fuel Pressure Regulator: A stuck closed fuel pressure regulator will cause a rich fuel condition.
Fuel Return: A restricted fuel return line will cause a rich fuel condition.
White/Gray Smoke: White exhaust smoke is an indication that coolant is burning in the combustion chamber. These are possible causes:
Cylinder Head: A crack in the cylinder head (around the coolant jacket) will cause coolant to enter the combustion chamber.
Engine Block: A crack in the deck of an engine block near the coolant jacket will cause coolant to enter the combustion chamber.
Head Gasket: A damaged or blown head gasket will cause coolant to enter the combustion chamber resulting in white/gray smoke coming from the tailpipe.

The engine on your 2000 Marauder 800 is the same 805cc engine as on my 2006 Boulevard S-50. They take two spark plugs, one per cylinder near the exhaust ports. I recommend NGK- 5129 gapped at 0.035 inches.

Is it a lot of white smoke? White/Gray Smoke: White exhaust smoke is an indication that coolant is burning in the combustion chamber. These are possible causes:
Cylinder Head: A crack in the cylinder head (around the coolant jacket) will cause coolant to enter the combustion chamber.


Although for some cars white smoke is normal, as long as it is not super excessive.

It seems there is too much of fuel going into the non firing cylinder thus the blackish spark plug, recheck the float level to that carburater and also check the valve clearance.

Definately try a spark plug first. What does the old spark plug look like? ( white, oil fouled, melted, metallic?). Usually a fuel issue will make the inoperable cylinder very hot. Might have a loose valve guide in the head, or a bent valve.

What color is the smoke? White is coolant and bluish is oil being burnt. What color is the plug from the dead cylinder? Tan is good. You might just have a dead plug and/or wire or you might have an engine rebuild.

check fuel filter and air intake and fuel tank vents

Are you sure the smoke is white? White smoke is usually caused by antifreeze burning.(This could be a head gasket)

If the smoke is actually light gray it is oil burning.(This would be rings or valve seals)

If it smokes mostly on startup and then stops when it warms up (It could be a worn valve guide or deteriorated valve guide seal (or possibly several) allowing a tiny amount of oil into one or more cylinders).

If it smokes mostly when you are cornering (It could be too much oil in the crankcase).

Please rate this a fixya

your cooling system is preasureising due to a leaking cylinder head gasket the white smoke you see is coolant passing through the exhaust valve on the offending cylinder have the cooling system tested for CO content hope this advice helps