GL 1500

575 Views 7 Replies 4 Participants Last post by EricPringle, Jun 18, 2009

EricPringle

Discussion Starter · Jun 17, 2009

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Hi all, after fitting a new alternator I took the bike out for a 400 km run yesterday. As I was returning I stopped on the offramp to the highway to wait for my buddy. Much to my dismay I noticed a horrible rumbling noise coming from the front of the motor and a vibration which disappears at about 3000 rpm. Could it be a collapsed cambelt idler bearing?

Sorry forgot to mention this is on the 1500.

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agnogel

· #2 · Jun 17, 2009

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hi eric most likely or water pump bearing best to get a long screwdriver put one end to your ear handel side and the other if you touch it around the timeing cover ect you should be able to pinpoint the noise

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EricPringle

Discussion Starter · #3 · Jun 17, 2009

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Thanks Agnogel, I guess I'll have to start pulling tupperware, again, tonight. I'm starting to feel rather despondent concerning this bike. Since I bought it, it's just been one thing after the other. I've fitted new tyres, changed out oil, plugs, filters etc. Replaced the rear disc and pads. First long run the alternator packs up. Second run I get back and all this horrible noise and vibration. I don't think this bike likes me and the feeling is rapidly becoming mutual. It's spending more time in my workshop than on the road. Not to mention the dreaded stumbling between idle and 2000 rpm. I'm starting to regret buying the damn thing!

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agnogel

· #4 · Jun 17, 2009

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the prob will all second hand bikes cars ect is you dont know what work the po did if any or how they rode it iam sure when you get it sortedthere will be a big smile on your face going down the road i have spent a fortune on mine wich i will never get back if i sold the bike but the enjoyment i get is well worth the money:action:

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Bondy

· #5 · Jun 17, 2009

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Not an expert, but could this be the " 1500 clutch rumble" which is common on many 1500s, and is not doing any harm, pull the clutch lever in at idle and see if it stops.

Good Luck.

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EricPringle

Discussion Starter · #6 · Jun 17, 2009

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Hi Bondy, this aint no clutch rumble. It's much worse than that. Maybe I should describe it as a busted bearing noise. I'll pull the covers tonight and check. Let you know in the morning what I find.

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Rudy

· #7 · Jun 17, 2009

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The work you are doing and the work you have done is nothing more or less than should be done when a new bike is acquired.
At least you have the benefit of doing it in the shop as opposed to doing it out in the sticks someplace.

Change the paint color to red and I'm sure everything will get much better. :waving:

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EricPringle

Discussion Starter · #8 · Jun 18, 2009

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Hi all, just an update. I started the bike when I got home last night. You won't believe it but it's the brand new alternator!
Agnogel's trick with the screwdriver pinpointed the problem although it's so noisy it was easy to determine where the noise was coming from.
I pulled the alt and it appears that the rotor has moved so far back as to allow the rear cooling fan to contact the diffuser in front of the rectifier plate, and the drive coupling has rubbed against the front cover with enough friction to burn the new damper rubbers. Even the drive coupling has turned blue from the heat.
The old alternator was also damaged in this fashion but the PO mentioned having had the alt repaired.
Is it possible that the drive coupling in the motor is forcing the rotor back while under load? When installing the alternator I managed to move it fully home without having to use the bolts to seat it so I know there is no force there while the motor is not running.
I have searched the forum and have not come across anyone else experiencing this problem.
Honda tells me there is no guarantee on electrical parts but I will nevertheless contact them and see what they have to say. This alt has after all, only done 500 km.

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