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THE FOLLOWING LIST CONTAINS POTENTIAL CAUSES OF PISTON AND/OR CYLINDER FAILURE:
1.) INSUFFICIENT OR IMPROPER BREAK-IN PROCEDURE. 2.) Cold seizure ( insufficient warm-up) 3.) Failure to properly wash and pre-lube piston and cylinder prior to assembly 4.) Insufficient air speed through fins on air cooled engines 5.) Improper ignition timing 6.) Carburetor jetting to lean 7.) Carburetor jetting too rich 8.) Gas and Oil not thoroughly mixed 9.) Excessive load on or lugging of the engine 10.) Worn out or improperly installed crank seals 11.) Blown head gasket 12.) Head gasket improperly installed 13.) Engine speed too high during break-in period 14.) Alteration of intake or exhaust system without rejetting 15.) Insufficient ring end gap 16.) Too much ring end gas 17.) Improper ring style or type 18.) Insufficient oil in gas 19.) Too much oil in gas 20.) Poor quality, cheap or wrong oil 21.) Too much compression 22.) Bad or old gas 23.) Gas with too low of an octane rating 24.) Addition of the wrong gasoline antifreeze in mixed gas 25.) Fuel additives improperly mixed or used 26.) Improper spark plug 27.) Insufficient piston to wall clearance 28.) Too much piston wall clearance 29.) Use of badly worn or distorted piston in fresh bore 30.) Pre-ignition 31.) Detonation 32.) Insufficient piston to squish band clearance 33.) Plugged or restricted exhaust system 34.) Air leaks around intake manifold, base gasket or center gasket 35.) Use of a piston other than the one the cylinder was originally sized to 36.) Honing too course 37.) No honing at all 38.) Head bolts over-torqued 39.) Faulty or stuck thermostat 40.) Thermostat removed from system 41.) Bad oil pump 42.) Bad water pump 43.) Improper cooling: low water level, fins clogged with mud 44.) Use of oxygenate gas without re-jetting 45.) Carburetors not synchronized 46.) Loose fitting sleeve 47.) Cracked sleeve 48.) Ice in oil line 49.) Ice in fuel line 50.) Clogged, pinched or leaking fuel or oil line 51.) Cooling system not properly bled 52.) Oil injection system not properly bled 53.) Improperly installed fan shrouds 54.) Plugged jets 55.) Loose or broken fan belt 56.) Water in float bowl 57.) Dirt in float bowl 58.) Loose or missing drain plug 59.) Anti-freeze in combustion chamber; faulty head gasket or cracks 60.) Insufficient fuel; may need two fuel pumps 61.) Leaking, loose or plugged fuel pump pulse line 62.) Bad fuel pump 63.) Loose, leaking or plugged pulse line 64.) Poor quality piston 65.) Clutch not properly set up. 66.) Cracked fuel line in tan 67.) No snow on heat exchange 68.) Diesel fuel in gas tank 69.) Improperly installed piston return spring 70.) Too much alcohol in driver 71.) By far the most common cause of piston and engine failure comes from the loose nut that sits on
the seat and over revs the engine instead of shifting it and generally doesn’t have an
understanding of what really makes it work or how to keep it serviced.