Rotor removal on 1200 triple

W

Wheelnut

New member
Location
England
I need to take off the alternator from my 1200 triple so that I can fix an oil leak from that side. It seems that the casting has distorted at the lower edge so will need to be removed from the engine and machined flat. Or I might get away with flatting it off with some abrasive paper on a sheet of plate glass.

Am I right in thinking that the thread on the rotor is M45 x 1.5? If so, it looks as if I can get a British made puller from GB Motorcycle Products for about £30. Also, do I need a rotor holding tool to do this job? I'm thinking that the rotor nut can be undone simply by putting the bike in gear and pressing on the rear brake, in which case a holding tool is not needed.

Anything else I should be aware of before I start on this task?
Any advice welcomed!
 
Wheelnut said:
I need to take off the alternator from my 1200 triple so that I can fix an oil leak from that side. It seems that the casting has distorted at the lower edge so will need to be removed from the engine and machined flat. Or I might get away with flatting it off with some abrasive paper on a sheet of plate glass.

Am I right in thinking that the thread on the rotor is M45 x 1.5? If so, it looks as if I can get a British made puller from GB Motorcycle Products for about £30. Also, do I need a rotor holding tool to do this job? I'm thinking that the rotor nut can be undone simply by putting the bike in gear and pressing on the rear brake, in which case a holding tool is not needed.

Anything else I should be aware of before I start on this task?
Any advice welcomed!
Click to expand...
The nuts are Left hand thread on the series 1 bikes. There is the obvious one on the end of the crank and an inner one. You might need a big box spanner for the inner one.
 
That oil leak can be traced back to several issues, most difficult is micro crack(s) in the casting, or simply a hardened oil seal, talcum powder can identify sources of a leak, though not all the time. The leak you mention has been addressed over the years/decades on forums, this one i believe, included in the last few years.

Good you asked here first, BTW reducing the mating surface by machining flat can bring other issues. Sometimes it is more effective to source a used item known to be non leaking, though obviously a used inner casting may be a faulty one... not sure that helps.

In my case i sourced a replacement inner casting, proved too problematic to rectify the leaking one. j.
 
Job completed in an evening, and that included making the replacement gasket. Only special tool needed was the rotor removal tool, which arrived a day after ordering from GB Motorcycle Products. It's a really nicely made bit of kit, with well formed threads and made of decent steel, unlike some I have used which seem to be made of cheese!

The starter gear cover casting was checked but was not distorted and the problem was caused by nothing more than a badly fitted gasket. It was barely touching the mating surfaces at one place.

Job done. I was dreading it, but in the end was surprised how easy it was.
 
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