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Steve, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 6983
Experience:  30+ yrs. experience, MMI, HD technician, HD early, engine rebuild/performance, bike builder, kit bike program manager, CCI 2001-2004
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would a bad voes switch cause an 80 inch evo motor to have

Resolved Question:

would a bad voes switch cause an 80 inch evo motor to have bottom end knock at idle?
Submitted: 6 years ago.
Category: Motorcycle
Expert:  Steve replied 6 years ago.

Welcome. Thank you for choosing Just Answer.


a bad VOES would not, in itself, cause a bottom end knock.

all it does is retard the timing a few degrees to prevent detonation.


you can tell if you have a problem with the flywheels with a simple test.

with the engine at idle and making the knock, kill the ignition and listen.

if the knock continues as the flywheels coast down, you have a valve train noise.

but if the knock goes away immediately when you cut the ignition, you have a bottom end problem.

it is also simple enough to test the VOES to verify that is not your problem.

let me know what you find.


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