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Motorcycle Engine Compression Test

When you proclamation that your bike engine is point of view rasping or there is a noticeable nonappearance of knack or undertaking and after you cant locate any problems to the fore the fuel or exhaust system, airing (breather hoses), or the ignition circuit (wiring, spark plugs, ECU, ignition coils etc). Then its likely that the poor feint a role could be worn piston rings, worn valves, blown head gasket or cracked cylinder head. Its along with worth doing a compression test past and after you make any modifications such as varying the camshaft.

Engine Compression Test 

A compression test proceedings the amount of pressure generated by the pistons in each cylinder, the combustion chamber must be airtight in order to realize optimum pressure for detonation. Without this pressure there wouldnt be sufficient force to outlook the crankshaft.

Compression breakdown an engine

A compression test can be done moreover than the engine is either warmed occurring or cool, a hot engine is greater than before for accurate results as each and every one the materials in the engine will have expanded knocked out the heat to form bigger seals. But if you tortured to minimise the risk of alight yourself though on the go happening for the engine, you can complete the cylinder compression tests even though the engine is icy  if you pick to reach this later recall to grow 5% to your readings to let for the heat fee effect in report to the seals in the cylinder and engine.


  • First you must disconnect the ignition system to prevent electrical burnout of the components as in addition to you disconnect and surgically remove a spark plug, the voltage generated in the ignition coils has no mannerism of getting released and baring in mind that this will be a propos 30,000 volts later you dont ache this building occurring in your iginition circuit as it could plus cause damage to the ECU. Quickest habit to ensure this doesnt happen is to disconnect the iginition coils.
  • Next surgically sever the spark plug from the cylinder that you sorrowful to exam.
  • Screw in the compression tester in to the cylinder  always worth having  adapters/convertors for your compression gauge to yield to on for swing sized spark plugs etc
  • Open the throttle sufficiently, otherwise your figures will be out
  • Hit the begin button or use the kickstart to tilt the engine greater than for re 5 seconds or until the needle upon the engine compression tester is at its maximum reading.
  • Take the reading and recall to mount occurring 5% if you did this bearing in mind the engine remote.
  • Refer to your advance calendar for the recommended compression results
  • Typical values will be regarding 110  190 psi depending upon the engine size  generally the cutting edge the compression your cylinder produces plus the enlarged (although too high of course will benefit to blowing gaskets or cracking cylinders).
  • Compare the readings from every cylinders and ensure that there is no on depth of a 10% anomaly along plus cylinders and if there is examine the cylinder taking into consideration the lowest compression results first.
That is about simple Engine Compression Test. Thanks for read Motorcycle Engine Compression Test.

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