Question about 2002 KTM MXC 520 Racing
Any maintance tips?Piston seizures are due to lack of lubrication and/or a way too lean mixture - incorrect ignition timing unless it is a mechanical failure of the rings bearings or rod. Just like a car engine, there should be a thermostat in the cooling system, so that the engine can warm up quickly and maintain an even engine temperature. If the crank and rod is still okay, then check the mating surfaces of the crankcase to cylinder and cylinder to cylinder head. Be sure that the cooling system is clean and that the water pump is working okay. Bleed all the air out of the cooling system before you start the motor again. 2 strokes get all kinds of mods done to them, so it is hard to determine what the correct jetting should be unless the entire intake, exhaust and port timing are all OEM standard. Go with a richer jet and some non-synthetic oil in somewhat heavier ratios, to help break in the new parts. Adding more oil actually can cause the jetting to lean down, due to added weight of the fluid mixture slowing the flow through the jets. There are several Honda Elsinore MX websites out there to help guide you through the setup process, once the type and make of parts are known. Each manufacturer of exhaust and intake systems will have different setup suggestions. Always warm the engines up slowly, until the cooling system is circulating properly. Inspect the carburetor for any kinds of debris or contamination that could cause lean running and verify ignition timing specs. Intake manifolding and/or reed valves need to be checked carefully for air leaks/damage. If the bike was run HOT with failing cooling system, the damage to the crankshaft rod may not be visually apparent, so a crank rebuild may be in order, so you know that the bearings are not damaged. Considering that there was coolant in the crankcase, a crank rebuild really is a necessity, as old coolant will etch and damage ball and needle bearings, as well as the crankpin and rod end. If gasket failure isn't apparent, then you may have to have the cylinder and head pressure checked to identify any hairline cracks that may open up under heat and pressure. Use OEM Honda gaskets to prevent material failures, which can occur with after-market parts.,,,
Posted on Nov 10, 2008
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Posted on Jan 02, 2017
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