Rod Bearing Selection is this normal?? - Honda Motorcycles -
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post #1 of 3 Old 05-29-2016, 10:53 AM Thread Starter
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Rod Bearing Selection is this normal??

Guys, after finding the metal in my oil pan I'm taking no chances. It seems I have three C-2 and one C-3 bearing stamps on my rods. no.'s 1,2,3 are C-2 and no.4 is C-3. Is this normal that they are different like that? AM I readin this chart right? So I need 3 Black and 1 Blue? I'm confused because next to black it says B and next to Blue it says A, Help!! I'm used to Chevy motors where we cut the crank journal to all be the same. Also, I know it;s a good idea but with this ID the way it is if the journals are clean and the finish is nice do you really need to plastigauge them. The motor has 50,000 miles on it. It's not like I took it to a machine shop and had it cut and then I'm ordering a bearing, this seems spelled out. DO YOU GUYS CHECK THIS!!! YES I KNOW THE RIGHT WAY IS TO CHECK. What I'm asking is how many of you guys have just slapped them in without checking?

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post #2 of 3 Old 05-29-2016, 2:51 PM
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Re: Rod Bearing Selection is this normal??

Don't go by the letter stamped on the rod. The letter on the rod is it's weight code. So if you had to replace a rod, when you ordered it from Honda you would need to get a "C" weighted one to match the old one.

For rod bearings replacements, cross reference your stamp on the crankshaft, which is crankpin OD (LAABB) for example. Check your rod ID "number" stamp, which is rod ID, "2" for example, and go to the chart.

In my scenario for cylinder number 1, an A crank stamp and a rod number of 2 would require a Green bearing. And that's the process for each other rod.

When you then go to order your hearing you'll notice on a site like Partzilla they designate them by the "letter", which is the clearance range. They stamp the color on them for easier identification upon removal. The letter associated with the color in the chart means nothing as far as you determining which size to get, Honda sells them by the letter, but you seem to be using a non Honda OE manual, as your chart is different than mine. In the OE Honda manual the color is in parentheses on the chart, because you order them by the "letter".

Now, to answer you other question. "Can you just replace with the same color bearing and feel ok about it without plastigauging?? Yes, BUT, I have always plastigauged. In one instance even though the crank was clean with no marring, I had plans to just replace by the colors. But because I just couldn't live with myself if I didn't I plastigauged and the measurement wasn't spot on , so I had to go to the next color (dimension range).

I guess after all that is just take the extra time and gauge them. I hope that helps you out.

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post #3 of 3 Old 05-30-2016, 3:11 PM Thread Starter
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Re: Rod Bearing Selection is this normal??

Thanks, Ian, I misunderstood, my rods are stamped as follows, no. 1 cylinder stamped C2 no. 2 C2 no 3 C2 and no 4 C3. When I read the manual I thought these where the numbers they told me to use for the bearing selection. I will go read it again as I'm aware of the stamping on the crank. I guess I thought these would match the front of the crank. Also, I was wondering if anyone knows if the bearing material is magnetic because the chips in my oil pan stick to a magnet. I started ripping it down and so far everything is in great shape, I haven't got to the bearings yet.

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