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Hi everybody,

I wrote few minutes ago (Member Indroduction), that my Brother has a problem with engine repair.

It is Honda CB 450 Sport, year of production: 1988.

Problem is: how to choose the right bearing shells for crankshaft and connecting rod?

We have manual (in attch.), but we are not sure how to do this.

If somebody has this "secret knowlage", please help us. Please, write it easiest how you can, because it is note simply topic.

This motorbike will stay in our family, and we would like to make this engine repair correctely.

Thank you in advance!

Best regards

Radek
 

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The crankshaft has codes stamped into the counterbalance weights. 1, 2, and 3 plus the letter A, B, or C. The bearing holders on the crankcase also have codes stamped in them. If the first bearing holder is "A" and the first crankshaft journal is "B" you would enter the chart on the left side using line "A", then go across to column "B" indicating the proper bearing is "green".

The connecting rod codes are stamped into the balance weights below the crankshaft codes and use numbers instead of letters. Same drill, enter the chart on the left side using the number stamped on the connecting rod and go across to the column corresponding to the crank pin code.

If you provide the codes on your engine we can double check with you to ensure you use the right bearings.
 

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You use the 2 charts, lettered one for the main bearings and numbered one for the rods
201_4410.JPG 201_4409.JPG

Look at the rear of the upper case for 3 letters
201_4379.JPG

Use the letters found painted on the crankshaft

201_4378.JPG

Note the 2 numbers also on the crankshaft, those are for the rod bearings. Use this number pluf the one etched on the side of the rod cap

201_4415.JPG
 

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In this group of pictures the crankshaft needs Brown (C/A) bearings for 2 journals and Black (C/B) for the third. Note that the bearing shells are sold in halves so in this case you would order 4 Brown and 2 Black.
The rods on this engine were both marked as 1 so it needed Green bearings (2/1).
 

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Be carefull on re assembly that the rods to pistons are placed so the rod oil hole is to the rear, the inlet side. Sometimes the rod ink stamp can be the devil to see, but is very clear in ldr's picture. Sometime you have to use the "light" to see the ink stamp.

From memory the ink stamp is to the rear of the rod, and the shell bearing cut outs to the front, from memory, so check.

The main bearing outer codes are stamped into the crank case upper.

If you zoom into LDR's rod picture you can just make out the shell bearing cut out in the cap.
 
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