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TOPIC: Crankshaft journal sizes

Crankshaft journal sizes 1 month 3 days ago #23643

  • stunter01
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Hi
I need some specs on a 81 KZ1300 crankshaft
I got a manual but there is no spec on journal sizes for big ends and mains like oil ckearance
And minimum sizes of journals etc
Anybody that can help me with it please

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Crankshaft journal sizes 1 month 2 days ago #23647

  • Kawboy
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stunter01 wrote: Hi
I need some specs on a 81 KZ1300 crankshaft
I got a manual but there is no spec on journal sizes for big ends and mains like oil ckearance
And minimum sizes of journals etc
Anybody that can help me with it please

Hate to be the bearer of unwanted news but it needs to be said. Journal sizes on the mains and conrod journals can vary due to forging and then machining. Quite often if/when the factory grind up the journals, they would stamp the counterweights to indicate a journal that might be .010- .020" under. You can never depend on the journal sizes and you need to mic them up.
Not sure why you want this info. What you should be doing is plastigauge the conrod journal clearances and the main clearances as per pages 187 and 188 of the service manual and if you need bearings, there are markings on the conrod and the counterweights and based on those markings, there's a chart in the manual (page 187) telling you based on the markings, which bearings to buy

Hope this helps,
KB
1980 KZ1300 B2 converting to an A2.

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Crankshaft journal sizes 1 month 2 days ago #23650

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Just to add to what has been said.

I bought crankshaft journal bearings according to markings on the crank case and the crank shaft (both are from different engines). I chose these bearings following a table in the manual, and were 'black' in my case.
Next - used plastigauge to check the clearances. I think this is the best direct method to see what is happening. In my case, the clearances were 0.038 mm in all except one, which was about 0.043 mm in my estimate (stator side).
The service limit per manual is 0.1 mm (and connecting rod big end 0.1 mm as well). Having my clearances measured using correct and new bearings for this particular crank case and crank shaft pair, considering that the crank shaft is not new and hypothetically worn a bit (looks smooth and nice), the conclusion for me is these clearances are about what correct clearances should be, and there is still lots of life for this engine.
1982 Kawasaki KZ1300 A4
Building an engine from random parts. This will eventually morph into building a bike from random parts - if it ever happens. Need a frame to begin with.

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Crankshaft journal sizes 4 weeks 2 days ago #23665

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1982 Kawasaki KZ1300 A4
Building an engine from random parts. This will eventually morph into building a bike from random parts - if it ever happens. Need a frame to begin with.
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Crankshaft journal sizes 4 weeks 2 days ago #23673

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Thanks kawboy and stan
This helps a lot i know where to look for the markings on the casing and crankshaft. What would be the minimum crearance between the journal and bearings i see that max is 0.1mm
Thanks for the replies

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Crankshaft journal sizes 4 weeks 1 day ago #23678

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stunter01 wrote: Thanks kawboy and stan
This helps a lot i know where to look for the markings on the casing and crankshaft. What would be the minimum crearance between the journal and bearings i see that max is 0.1mm
Thanks for the replies

Clearances are on page 187 and 188 of the service manual. If you don't have one, go to the Home page of this website and download the manual (free).
1980 KZ1300 B2 converting to an A2.

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