Author Topic: Hello and stator plate  (Read 1403 times)

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Offline 50gary

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Hello and stator plate
« on: October 27, 2008, 02:22:09 PM »
Hi very first thread/post here hello to all and it appears to be a good place to find information on these vintage Yamaha.  I have a 1976 YZ400 and a 1979 IT400, neither of which run.  The YZ400 stator plate has been cobbled (imagine that on a 32 old bike) I think the plate is not original. I need to know the proper stator plate and timing marks, I cannot see a mark on the crankcase to align the plate to?  Yes I bought a Clymer's manual and it's not much help.  I would like to put lights on as well if at all possible. The crank has new bearings and crank seals the carburetor looks fine and pretty clean inside, compression is good.  I got the YZ for free and paid $75.00 US for the IT.  So here I am, help, advise, and information appreciated.
  Cheers, 50gary
In Hoc Sigma Vinces  I was born to laugh at Tornadoes

Offline Griffo

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Re: Hello and stator plate
« Reply #1 on: October 27, 2008, 08:36:15 PM »
Does it have a TDC Flywheel mark?
SV1000S K3, IT465H x3, MX80, DS80, YZ250 09, YZ250 85, + a couple of Dirt Turtles...

Offline 50gary

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Re: Hello and stator plate
« Reply #2 on: October 27, 2008, 10:14:39 PM »
Yes, it has three close spaced marks on the flywheel, I would imagine the middle is TDC?  Isn't there supposed to be a crankcase mark?  Thanks forthe reply.
  Cheers, 50gary
In Hoc Sigma Vinces  I was born to laugh at Tornadoes

Offline Griffo

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Re: Hello and stator plate
« Reply #3 on: November 03, 2008, 07:48:31 PM »
You have to find top dead centre on the engine using a dial indicator, then punch a mark onto the crankcase relative to the marks on the flywheel.
The factory yammy manual goes into this.
If you don't have a copy, you can buy them on CD off ebay.
SV1000S K3, IT465H x3, MX80, DS80, YZ250 09, YZ250 85, + a couple of Dirt Turtles...

Offline 50gary

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Re: Hello and stator plate
« Reply #4 on: November 04, 2008, 11:42:39 PM »
Thanks, for the idea.  I'll try that right away. 
  Cheers, 50gary
In Hoc Sigma Vinces  I was born to laugh at Tornadoes

Offline ws6transam

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Re: Hello and stator plate
« Reply #5 on: November 05, 2008, 02:53:55 AM »
Gary, the factory manuals will specify in terms of millimeters, the distance down the bore that the piston is supposed to be at where the TDC mark on the flywheel lines up to the TDC mark on the crankcase. That will be the mark that you line up your stator plate to match.

So, find TDC, set your dial indicator to 0.000

Then back up the piston until the dial indictor has shown that the piston has dropped the stated distance. Then, punch a mark on the crankcase that lines up with the TDC mark on the flywheel.

Then you remove the flywheel, and adjust the stator plate so that it's center scribe mark aligns with your new punchmark.


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