K75 compression test

[cycle thread]

Hello all,

I would like to do a cylinder compression test on my 1989 K75, and not wanting to risk damage to the ignition system, or have petrol going everywhere, is there a way to isolate the ignition and fuel pump, but still be able to turn the engine over on the starter motor?.

The last engine I did, an older car, it was just a mater of disconnecting the power feed to the coil, and spinning it over on the starter!.

Thanks,

John

[The Mighty Gryphon]

Just did a compression test on my K75.  Unplugged spark plug wires, removed the plugs and ran the test.  Only took 3-4 revolutions to get a reading on each cylinder.

Put everything back together and the bike runs just fine.

[rbm]

To stop the fuel pump, pull the 4-pin connector going to the fuel tank.  To disconnect the ignition and injectors, pull the 4-pin connector for the secondary harness located on the rear left side under the tank.  As Gryphon says, it's probably not needed for the test you are performing.  BTW you'll need a 14mm adapter for your compression tester; just saying because this size is usually not included in the kits you can buy and must be obtained separately.

[cycle thread]

Hello, sorry for my ridiculously late reply.....

Thanks for you're good advice, MG and RBM, have only just got back to working on the K75 after a lay off, advice very much appreciated,

John

[Gio]

More importantly John - did you obtain ridiculously satisfactory compression numbers on all cylinders?

[cycle thread]

Hello Gio,

Ashamed to say I have not performed the compression test yet!!, shall post the results here when I do, hopefully they will be very satisfactory...... :)

John