Loud noise when the engine goes off - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 4 Old 07-30-2019, 02:24 AM Thread Starter
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Loud noise when the engine goes off

Hey folks,

I'm Sandesh, I own a CBR250R 2011. Recently got the engine rebuilt. I am using Motul 7100 10w/40 FS oil. Whenever I power off the engine, a loud noise comes from the left side of the engine casing where the one way clutch and stator coil sits. I took it to Highlander Bangalore, the mech said it is nothing to worry. However, the sound is severely loud. As though some is banging the casing with a sledge hammer. I assume, it is the one way clutch disconnecting with the starter motor causing the noise. Few of 'em say that it is a "bendix drive" issue. Has anyone else come across this issue?

Thank you!
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post #2 of 4 Old 08-03-2019, 01:48 PM
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The is a little difficult to describe but I will try.
The starter motor clutch is a oneway only clutch.
When you shut the engine off there no longer any spark
and the engine freewheels until there is not enough
momentum to go completely thru the compression cycle.
At that time the compression actually forces the piston
back down making the engine rotate in the opposite
direction that it runs. At that time the one way starter
clutch instantly engages and you hear a thunk or clank.
How far up on compression the motor was on determines
how loud the clunk is. The only thing you might check is
the starter motor nuts and bolts are not loose which could
add to the sound.

My bike does it every time i shut it off and it is what it is.
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post #3 of 4 Old 08-05-2019, 11:05 AM
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I wouldn't say it should sound like a sledge hammer, but there is occasionally a "clunk" sound that's difficult to describe, and it does vary in intensity depending on where the engine decides to come to a stop.

Tis better to be thought a fool and remain silent, than to open one's mouth and remove all doubt.
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post #4 of 4 Old 08-05-2019, 01:18 PM
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As others have noted - almost every cycle engine will make some noise when you turn it off and the starter drive disengages. It's not always the same.

You could pull the starter and check the condition and operation of the drive, as well and checking that it is properly lubed with the recommended lubricant. I'm not certain what they would be, or if it get lubed at all, but some greases that Honda uses seem to be pretty heavy and waxy.

We rebuilt a Honda brake caliper yesterday, and the grease that was used on the sliding pins was thick and waxy - which increased the effort required for it to slide. After cleaning and lubing with a light synthetic grease it operated much smoother and required a lot less force.
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