Dumb A#$ attack

[wingnut]

OK I had a dumb a@# attack Best buddy bought the 750 that was on Ebay last week in North Carolina. Bike is in really good condition. PO said the starter did not work and it had been sitting for a year. He's doing the brakes and I’m waiting for the carb kits so I can try and remember what I did to get mine right a year ago, We removed the starter and disassembled it after troubleshooting the problem down to the starter itself. Opened up the starter and found the armature missing!!! This is where the brain freeze came into play. The 1100 guy said to the 750 guy, Hey I have a starter on my 1100F partser. You are welcome to it if it will help. 750 guy says thanks I’ll take it, and proceeds to disassemble 1100 starter and use the armature and the field coils. He puts everything together, puts it back on the bike after bench test. And we are ready to hit the button. So the question for the reader is what happened? I’ll tell ya. Its spins backwards for the 750. I had forgotten that our beloved beast turns in the opposite direction as the rest of the Yamaha fleet. So does any one have a starter for a 750 that they would be willing to let go of.?

Thanks
Dave

[mro]

DC motor

Try reversing the pos/neg connection inside the motor.
Have not had an XS starter apart so not sure if can be done.


mro

[prometheus578]

"Now isn't that interesting?"

Not that my thoughts dwell on starters much.
I've never thought about it.
Would they actually make starters that run in different directions?
I've seen starters mesh directly to starter clutches, but have also seen starters mesh to an intermediate gear, then the clutch.
Sure... it could be for reduction gearing...

Does anyone have the definative answer concerning Jap starters and if there's two types?(meaning... run in opposite directions)

Wingnut, please post your results.

[wingnut]

750 Starter 1J7-81800-60-00
Brush Plate 1J7-81840-60-00
Armature 37181850-20-00
Stator 1J781810-20-00

1100 Starter 2H7-81800-60-00
Brush Plate 371-81840-20-00
Armature 2H7-81850-60-00
Stator 2H7-81810-60-00

As you can see the basic part number for the starter is the same. The prefix for the first year used changed. The components are similar but with out detail drawings I can’t tell what the differences are. When we put the “750” starter together we had to put the end pieces from the 750 on the 1100 Stator, Armature and Brush plate because they were different than the 1100 starter parts. The major thing that stands out to me now is that the nose end of the starter goes into the left hand case on the 750 and the nose end on the 1100 goes into the engine on the right hand side. So if you used a motor that was turning clockwise and turned it over 180 degrees the rotation would be backwards relative to the gears it was engaging. Either Yamaha added another gear in the train to compensate or they reversed the rotation on the motor. As soon as I get my hands on a 750 starter I’ll know for sure.
[B]

[fredintoon]

So who took it?

Hi Wingnut,
hopefully you can find another starter, the breakers gotta have one, right?
But which of the POs played Mr. Cleverdick
to rob the guts out of the starter and then carefully put it all back together again to unload on some unsuspecting buyer?
Fred Hill, S'toon.

[John]

One quick note

A co worker used to have an XS850 SG, and it needed a starter, He went to a salvage yard and bought one from a 750. He couldn't get it to mesh up, so he compared them side by side and found that the 850 starter had more splines on the shaft than the 750 starter, so be careful not to get one from an 850.

[wingnut]

Inbound Starter

Hey Fred, PO was a youg kid who got the bike from someone else. He stated in the write up that the starter didn't work. Don't know if he ever removed it to check it out. We have one coming from a fellow member. I'll post as soon as we get it.

Dave

[wingnut]

And the Answer is

The 1J7-81800-60-00 starter called out for the1979 XS750 turns CCW when facing the output shaft. The 2H78100-60-00 called out for the 1979 XS1100F turns CW, when facing the output shaft. So you can not remove the Brush plate, armature, and stator from one and replace it in the other and have a starter that turns the right way. Seems as our Yamaha friends did in fact build a starter just for the 1100. Thanks to Dave for the parts

[wingnut]

Picture

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[wingnut]

Picture

I know everyboby likes pictures



And yes in my last post I said it backwards