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Hello everyone,



Recently our GL 1500 has developped a sort of clattering noise which sounds as though its in the carburettor area. When bike is started and idling on the choke it is not there but when driving away and with engine under load it sounds as though a valve in the inlet tract is jumping open and shut. It is quite loud, but disappears when the engine has warmed up.



Could it be the duct valve in the hot air diaphragm actuator opening en shutting rapidly? Vacuum not holding?



Anybody experienced this before? Other suggestions what this could be?



Apart from this the bike runds perfectly.



rob bakker in holland.
 

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I would look at the rubber pieces in the alternator coupling .
They get hard with age , and can make strange noise.
 

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dutchaussie wrote:
...Recently our GL 1500 has developped a sort of clattering noise which sounds as though its in the carburettor area. When bike is started and idling on the choke it is not there but when driving away and with engine under load it sounds as though a valve in the inlet tract is jumping open and shut. It is quite loud, but disappears when the engine has warmed up....
> Loose exhaust manifold?... Check that the Chrome Nuts are present and snug, to each of the 6 exhaust pipes, where they meet the engine block.

When they are loose, you get a popping sound... that often goes away when the engine warms up.
 

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ALEX BERECZKY wrote:
dutchaussie wrote: > Loose exhaust manifold?... Check that the Chrome Nuts are present and snug, to each of the 6 exhaust pipes, where they meet the engine block.

When they are loose, you get a popping sound... that often goes away when the engine warms up.
+1 on the exhaust manifold. The noise you describe and when it happens exactly fits with a small blow around the manifold. Check the nuts are tight or, better still, change the 6 gaskets.
 

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My money is on the rubber hose on the forward, right, underside of the air filter housing.

My bike does that right now.
 

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AZgl1500 wrote:
My money is on the rubber hose on the forward, right, underside of the air filter housing.

My bike does that right now.
> You can inspect, and if need be Re-install, that hose most easily by removing the right fan housing... then reaching up to access it. (This is a lot easier than trying to install it by removing the air filter box, the normal way)
 
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