New with a question

John Rootes johnprootes at
Tue Aug 11 15:58:52 PDT 2009

Do you happen to know anything more about the tool? I work in a machine shop and can duplicate it if I know a little more about it. I have already fabricated a tool according to the clymer book with no success.
I'll assume I need the damper and the left crankshaft seal...Have been having issues finding the seal on the drawings most sites provide.
What do you think about replacing the bearing? I'm just wondering if the bearing has worn and the shaft has run out. The the new seal would be useless. have you run into this at all? Or is it just old rubber on the seal causing a leak.
If you happen to know where I can get the seal that would really be helpful. 
--- On Tue, 8/11/09, scapco at <scapco at> wrote:

From: scapco at <scapco at>
Subject: Re: New with a question
To: gpzlist at
Date: Tuesday, August 11, 2009, 6:26 PM

Hi John,

I'm fairly familiar with those, I had an 81 GPZ1100 and 
have restored several bikes from that era.

Most likely the problem is the seal at the left end of the 
crankshaft.  It's not uncommon on older bikes as the rubber 
seal gets brittle, especially with dirt bikes.  Getting the 
magneto assenbly off usually takes a special puller, you 
might need to see if your dealer will loan you one or yank 
it off for you.  The seal shouldn't be terribly hard to 
replace once you're in.

IMHO, the aftermarket magnetos on ebay are usually okay, 
I've used an aftermarket one on a previous project.  YMMV.

Charles S.

>Hi everyone,
>My name is John and I'm 32 from Kent, OH. My brother gave 
>me a 1984 GPZ1100 last year. It's bored over with 
>larger .mikuni's than the carberated Models>  I know of. 
>(most were fuel injected right?) I've been riding it as 
>much as I could until the oil leak became too much to 
>bear. It's coming out of The alternator cover area. I've 
>pulled off the cover and tried to remove the rotor from 
>the shaft as the clymer book states. The shaft required 
>should be M18x1.5 if anyone cares. I can't get the rotor 
>off. It should be a taperlock but I was wondering if it 
>could be threaded.
>Anyway, if anyone has any ideas where the oil is most 
>likely coming from under the cover that would be great.
>I also need to know how to get off the rotor.
>I'm also going to need a new rotor since I slipped and
>broke off a piece of the magnet. I've seen some cheap 
>replacement mods on another site that say they work better 
>than the original.
> Just looking for more input...


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