Loud Engine Rattle after WOT thru 2nd - 600RR.net
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post #1 of 9 (permalink) Old 07-06-2016, 01:49 AM Thread Starter
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Loud Engine Rattle after WOT thru 2nd

The engine just had valve inspection and maybe 20 miles on it since then. No adjustment was made as valves where within spec. Intake were all .20 but one was .23 and was left loose. Exhaust valves were all .28.

The bike was also just fitted with a Hamaguchi full exhaust with proper gaskets. APE cam chain tensioner with proper adjustment.
I rode home about 20 miles from the shop but didn't wring it out. Everything was smooth and silky.

Next day I take it out and ride around for about 15-20 min warming up the engine with low to mid revs. I decide to get on the freeway and get a nice opening to wring out 1st, 2nd and into 3rd when it sort of hesitates up top. I head home immediately and then recorded this:

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post #2 of 9 (permalink) Old 07-06-2016, 02:15 AM Thread Starter
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I pulled some oil to inspect and I am not sure if I'm just paranoid or if there is actually some metal swirl in there.

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post #3 of 9 (permalink) Old 07-06-2016, 02:26 AM Thread Starter
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Thumbs down

After pulling the oil and wondering if there is anything really in there to worry about I decide to replace the oil I removed. Re-adjust the APE tensioner and somehow got it to be slightly quieter. Then I went for an easy ride around the neighborhood. Once it was nice and warm and up to temperature I tried to get on it a little. The rattling was immediately apparent and seemingly getting worse.

I wasn't far but I rode home immediately. After getting off the bike I recorded this:



So now my guesses are a serious valve issue or spun bearing causing some contact somewhere? I hope to remove the valve cover tomorrow and inspect further. No more testing or riding.

Any thoughts out there? Questions that may lead to some answers?
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post #4 of 9 (permalink) Old 07-06-2016, 02:42 AM
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dude that sounds just like an exhaust leak.


check all the flanges and torque as required
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post #5 of 9 (permalink) Old 07-06-2016, 05:01 PM Thread Starter
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wibbly-- Thanks for your response! I took your advice and checked the flange bolts. First, visual inspection shows the all the pipes evenly mated to the block. I set the torque wrench to spec and tried all 8 bolts and they are all to spec. I had just installed the exhaust before the valve work I mentioned with brand new OEM copper gaskets on all 4 ports.

So it does not appear to be an exhaust leak. Hoping to open up the valve cover this week and get a closer inspection of what is going on. Might run the engine and pull the power to the coils one by one to see if I can narrow down a cylinder causing the noise or what.

Any other thoughts or tips to look for?

Thanks guys!
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post #6 of 9 (permalink) Old 08-29-2016, 11:30 PM
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That's an odd one especially since at idle it has that cyclic rattle that is not really in step with the engine.

What did you find out - if anything?

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post #7 of 9 (permalink) Old 08-30-2016, 12:31 AM
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Yeah I hope you got this figured out and if you did I hope you update us. That is a maddening sound ugh.

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post #8 of 9 (permalink) Old 08-30-2016, 02:08 AM
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This sounds like it's either in the valvetrain, possibly related to the camshaft(s), or the CCT mechanism since tightening it made the problem worse.
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post #9 of 9 (permalink) Old 09-09-2016, 07:33 AM
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Any news on this?!

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