rattling noise at high RPM


Information and questions on GL1200 Goldwings (1984-1987)
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5str48
Posts: 11
Joined: Thu Aug 07, 2014 2:13 am
Location: Reno, NV 89512
Motorcycle: 1986 GL1200A Aspencade

rattling noise at high RPM

Postby 5str48 » Fri May 06, 2016 3:34 pm



I have a rattling noise that occurs when the engine RPM goes above 3000. It's much less noticeable when the engine is cold. Matter of fact, it runs like a dream below 3000. I don't think it is piston slap, although I'm really not sure. It's more noticeable when I crank the throttle hard. Any thoughts?



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twocams
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Location: Grants Pass, Oregon
Motorcycle: 1985 GL1200 Aspencade, 2003 K1200GT BMW, 1969 R69S BMW
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Re: rattling noise at high RPM

Postby twocams » Fri May 06, 2016 6:44 pm

My thoughts....dont crank the throttle hard....keep below 3000 RPM. :shock: I would figure where its coming from, engine, exhaust, head area, clutch area, lower in the engine. You could get an engine stethoscope, like the doctors use only kooler. Or use a screwdriver, put the metal end on the...say valve cover. The handle up to your ear. See if it comes and goes as you move it around from place to place.

twocams

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WingAdmin
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Re: rattling noise at high RPM

Postby WingAdmin » Sat May 07, 2016 11:24 pm

5str48 wrote:I have a rattling noise that occurs when the engine RPM goes above 3000. It's much less noticeable when the engine is cold. Matter of fact, it runs like a dream below 3000. I don't think it is piston slap, although I'm really not sure. It's more noticeable when I crank the throttle hard. Any thoughts?


First rule out fuel - try a tank full of premium and see if it still happens. That will tell us if it is due to detonation.

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ekvh
Posts: 140
Joined: Thu Apr 29, 2010 9:52 am
Location: Grand Forks, ND
Motorcycle: 1977 gl1000

Re: rattling noise at high RPM

Postby ekvh » Sun May 08, 2016 8:42 am

Bolt used on the back of the stator is known to cause this if it has loosened up. It's the one you use to turn the motor over when replacing belts. Advice is to turn it clockwise only. It is a 17mm socket size and is under a 17 mm cover cap. It would take much to check.




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