Hard snapping noise from right side - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 6 (permalink) Old 03-18-2012, 11:52 PM Thread Starter
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Hard snapping noise from right side

If I put my bike (SP-2) on the side stand, and I then move the bike from left to right several times, I start to hear a loud, very dry snap every time it compresses / decompresses.
It seems to come from the right hand side, and disappears if I put the bike upright again.
It seems it only does it if leaning to the left.
It sounds like a snap if a bolt is coming loose, but then repeating.

I first thought it was from the sidestand, greased all up after demounting, but to no avail.
I also checked it anything toughs, but that seems not the case.

I suspect either a suspension link (but those were all greased up a month ago), or an engine bolt.

Before I go any further, any crazy ideas or suggestions?
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post #2 of 6 (permalink) Old 03-19-2012, 05:11 PM
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Check the steering head bearings...these are on the "to check routinely" list.



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post #3 of 6 (permalink) Old 03-19-2012, 06:18 PM Thread Starter
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Originally Posted by madbuyer View Post
Check the steering head bearings...these are on the "to check routinely" list.
Thanks!
Steering head bearings are ok, and re-torqued before.
Sound is clearly coming from the right side, around the foot peg.

I checked again last night, and I am pretty sure it is an engine bolt, allowing the engine casing to "scrape" against the frame, causing the snap.

Going to loose everything up, clean, and re-torque.
Just hope not to find a broken bolt.
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post #4 of 6 (permalink) Old 03-19-2012, 08:13 PM
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Originally Posted by ericjansen View Post
Thanks!
Steering head bearings are ok, and re-torqued before.
Sound is clearly coming from the right side, around the foot peg.

I checked again last night, and I am pretty sure it is an engine bolt, allowing the engine casing to "scrape" against the frame, causing the snap.

Going to loose everything up, clean, and re-torque.
Just hope not to find a broken bolt.
Make sure that you follow the procedure in the manual for which bolts to tighten in order. Have a look at your swingarm bearings and bolts/nuts also.




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post #5 of 6 (permalink) Old 03-19-2012, 09:12 PM Thread Starter
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Originally Posted by b.miller123 View Post
Make sure that you follow the procedure in the manual for which bolts to tighten in order. Have a look at your swingarm bearings and bolts/nuts also.
Yeah, right, saw the procedure in the manual.
Thanks though!

Eric

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Update:
Mystery solved.
Right hand side, low engine mount was indeed not torqued up to spec.
Cleaned and torqued up and the noise is gone.

It still puzzles me a bit why there can be so much play between the engine case and the frame, but everything else seems perfectly ok.

Last edited by ericjansen; 03-20-2012 at 03:07 AM. Reason: Updated info
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post #6 of 6 (permalink) Old 03-20-2012, 07:44 AM
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Quote:
Originally Posted by ericjansen View Post
Yeah, right, saw the procedure in the manual.
Thanks though!

Eric

Got ur money?

Update:
Mystery solved.
Right hand side, low engine mount was indeed not torqued up to spec.
Cleaned and torqued up and the noise is gone.

It still puzzles me a bit why there can be so much play between the engine case and the frame, but everything else seems perfectly ok.
It is probably because these frames really aren't designed to be 100% rigid. They have to be able to flex. Just a bolt coming loose will allow for flex. I recently just tried to install thorsten frame sliders, and when you pop out the bolt for the upper mount, you can put it back in right away, but if you move the bike at all, or let it sit there, the bike settles and that bolt won't go back in. Well not with the slider setup anyways. The stock one went back in, but you could see that the engine mount boss has moved slightly. The slider did go back in right away, but after that it was a no-go.

Iirc, the middle upper bolt is the first one installed, so when the others are in, and there is weight on the frame, things will shift even if only by less than a single mm.

And there Are six mounts not counting the swing arm. So you probably won't notice one being loose. Although LDH has said that HRC removed one of the bolts from the race bikes to make the frame flex more.




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Last edited by b.miller123; 03-20-2012 at 07:53 AM.
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