My 99 zx2 burning mix white smoke out at the exhaust pipe everytime i go over 4000rpm. i believe it's a blown head gasket but why only on high rpm? I'm very apretiate if somebody could provide me some info before i start to put that motor apart. lots of thanks.

Coolant leaking on engine and burning

The white smoke you are seeing is steam. From your description, sounds like you have coolent seeping into the combustion chamber, mixing with your fuel/air, and exiting out through your exhaust as steam. 1, blown head gasket. 2. cracked head or block, 3, warped head due to overheating. Most common is #1.

white smoke mostly is caused by over fueling so what i suggest you do is first of all check if there is no leak on the injectors and if there is none which means your valve sterm seals are damaged.When the head gasket is blown out you may have problems like :-loosing power when driving,over heating,idling problems and oil mixing with water, its not your head gasket.

One of the gaskets has blown at a point where the a water jacket is blowning into the cylinders but not mixing with an oil jacket on the heads. Try to use some Bars Leak and see if you can get it to seal and if not, their are also aluminum shavings mixed with sealer for some of the worse problems. If it seals you will then know that it will need a gasket replacement at some point

You are burning coolant, the head gasket can be put on Wrong, If your looking at the engine the right rear corner is the only oil passage for the head, you will see a difference in that corner of the head gasket. If your sure that the gasket is on right you may have a warped or cracked head or improper torqued head, all head bolts MUST be replaced when you do a new gasket cause the bolts stretch when torqued. The spec is 25, 50 then 50 then 1/4 turn for the bolt torque.. Make sure u start from the center of the head.

White smoke is burning antifreeze. You have more than likely blown a head gasket which is allowing coolant into the combustion chamber where is is being mixed with fuel and burnt.

SEE WHITE SMOKE YOU HAVE BLOWN HEAD GASKET OR INTAKE MANIFOLD GASKET LEAKING.IF YOU SEE BLUE SMOKE ENGINE BURNING OIL DUE TO WORN VALVE GUIDES AND WORN VALVE SEALS AND WORN PISTON RINGS. CHECK SPARK PLUGS IF THEY OIL SOAKED ENGINE BURNING OIL.

White smoke is a sign of coolant being burned in the exhaust.

The best test is a compression test.
Blue smoke means it's burning oil, due to worn out piston rings.
White smoke means it's mixing antifreeze and oil due to a bad head gasket or cracked head or block.

WHITE SMOKE IS BLOWN HEAD GASKET. BLUE SMOKE ENGINE BURNING OIL.DUE TO WORN PISTON RINGS AND WORN VALVE GUIDES.BLACK SMOKE EXCESSIVE RICH MIXTURE.CLOGGED AIR FILTER. FUEL PUMP PRESSURE TOO HIGH.SEVERE MISFIRE.LOW ENGINE COMPRESSION.