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Old 05-17-2014, 07:54 AM   #1
JRose OP
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rattling sound on take off

Does anyone else's F8 make a kind of rattling sound upon acceleratino in 1st gear. Sounds like someone beating a spoon inside a paint can. Only happens for a second when I first take off.
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Old 05-17-2014, 08:11 AM   #2
ebdavidson
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I've noticed it happen when my bike is under a lot of load (starting off, going up a hill...). I was using lower octane fuel at a higher altitude when it was happening. I'm not an expert on engines, but I know that poor mixture is a source of knocking. I put in some better quality fuel and it went away.
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Old 05-17-2014, 08:11 AM   #3
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There's a decal on your swingarm for that.
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Old 05-17-2014, 08:19 AM   #4
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Might be low octane fuel. I did just spend 4 days in the back woods of Mississippi with few quality fuel options. That and the bike was loaded down with a weeks worth of camping gear.

I'll get some good fuel in it and all the gear off and see if it still happens.
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Old 05-17-2014, 08:25 AM   #5
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Quote:
Originally Posted by JRose View Post
Might be low octane fuel. I did just spend 4 days in the back woods of Mississippi with few quality fuel options. That and the bike was loaded down with a weeks worth of camping gear.

I'll get some good fuel in it and all the gear off and see if it still happens.

There's a decal on your swingarm for that.
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Old 05-17-2014, 08:31 AM   #6
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If it goes away, then next time you could take a bit of octane booster along just in case.
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Old 05-17-2014, 08:38 AM   #7
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Checked it on the center stand, with no load.Measured slack is about 32mm, which is a little on the tight side. Would a couple mm too tight cause that rattle?
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Old 05-17-2014, 08:42 AM   #8
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Usually it's because it's way too loose but a few mm either way won't do it. If the slack is consistant as you turn the wheel (no tight spots) then the front sprocket is worn. Even if it looks reasonable, under load in first it hangs on to the chain a bit too long causing the rattle.
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Old 05-17-2014, 08:44 AM   #9
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Hesitant to think a sprocket is worn as its not even clicked 5000 miles yet.
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Old 05-17-2014, 08:50 AM   #10
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Hard to keep track of who has what here.

Loosen your chain to the middle of the spec then. Does it need service ie showing kinks when it's turned?

Anyway, it's the classic noise from an unhappy chain and sprockets. Let us know what fixes it please. Too many unfinished threads in here.............
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Old 05-17-2014, 09:03 AM   #11
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Will do. It's still covered in mud/sand and I'm about to give it a good cleaning this afternoon. I'll inspect and report back. Also will loosen it a bit and fill it with some good fuel. Might even run a fuel treatment through it

We had some pretty sketchy gas stops this week.

BTW, it's a 2013 GS.
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Old 05-17-2014, 11:15 AM   #12
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I am more inclined to say the chain... but who knows, the fuel issue would do that in a variety of conditions not just in the situation you describe.
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Old 05-17-2014, 02:38 PM   #13
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I will start with the chain, then the fuel, and report back.
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Old 05-17-2014, 04:07 PM   #14
chris73
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Manual says to check chain unloaded on the side stand. I had a ton of chain slap in first with my bike. Adjusted the chain to find the sweet spot and it's been perfect. Hope I adjusted right. Is it side stand or centre stand? I bet if you check on the side stand it wil touch the swing arm the whole way.
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Old 05-17-2014, 05:07 PM   #15
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I always took "unloaded" meant center stand....

FWIW, there isn't much change between side stand measurement and center stand.

So, I just cleaned her up and adjusted the chain to 40mm on the center stand. Seems to have fixed it. I wouldn't have thought a few mm tight would do that. I always run my chains on the tighter side of tolerances to allow stretching over time while remaining in spec.

There is a chance it could've been the fuel though. Last two fuel stops on the interstate commute home were good gas.

It'll be tomorrow before I know for sure. I'm at wok until 0800, and was only able to ride in a circle in our small parking lot, but it seems to be fixed.

Could it be all the dirt and mud causing the chain to sound funky?
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