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TOPIC: 1970 RT-1 CRANKSHAFT SHIM

1970 RT-1 CRANKSHAFT SHIM 05 Nov 2018 04:44 #1

  • JIMMYT70
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Could somebody tell me how thick the crankshaft shim should be on a 1970 RT-1. The shim is located on the magneto side and fits up against the crankshaft.Thanks

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1970 RT-1 CRANKSHAFT SHIM 05 Nov 2018 08:53 #2

  • DEET
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Assemble your cases (without the crank) with the bearings installed. Measure the distance between the bearing faces.
Measure the width of your crankshaft (the part that will touch the bearing faces).
Subtract the crank width from the bearing distance.
Divide that result by 2.
That is how thick your shim is supposed to be.


... and the shim goes on the PRIMARY side, not the magneto side.
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1970 RT-1 CRANKSHAFT SHIM 05 Nov 2018 10:17 #3

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Thanks Deet

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1970 RT-1 CRANKSHAFT SHIM 06 Nov 2018 15:57 #4

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Just to confuse ya all---unless i'm confused-- there should only be a shim on the righ side as the crank is bolted tight over that way by the primary hear nut. Anything you put on the mag side will do nothing except flop around although if you calculated it absolutely exact it could be under slight pressure to keep it from free wheeling. Ok that's my idea & now i'll go & look at a parts pic.
Ok, to Edit, had a look link below & nothing on the mag side. Granted the pic is a bit confusing but follow the line around to the right side, primary side, & No24 says 0.3mm thick or 12 thou by my calculations. Realy the idea --i think--is to end up with the conrod as close to the middle--crankcase joint--as feasible

look at this link. www.partzilla.com/catalog/yamaha/motorcy...970/rt1/crank-piston

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Last Edit: by RT325.

1970 RT-1 CRANKSHAFT SHIM 06 Nov 2018 16:07 #5

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Sorry DEET, i see you said that "primary side". Crawl back in my hole lol.
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