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Discussion Starter #1 (Edited)

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CL and CB's are the same engines.
CB450 pistons are the same diameter as CB500T pistons, so the head gaskets are the same. The 500T is basically a stroked 450, cylinders are the same on both bikes.
To bore out that radically, a copper head gasket will probably be needed.
 

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Discussion Starter #3
CL and CB's are the same engines.
CB450 pistons are the same diameter as CB500T pistons, so the head gaskets are the same. The 500T is basically a stroked 450, cylinders are the same on both bikes.
To bore out that radically, a copper head gasket will probably be needed.
Thanks for the advice! That clears some things up
 

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Hey Jricott2. your a fellow Torontonian. Im east end scarborough. You ever come down to bike night at Leslie and Lakeshore Thursday nights during nice weather? If not check it out theres a small group of vintage guys.

Regarding the pistons i saw them too but arent so interested as im in the middle of a CB750 build. I dont think they are CB500T pistons and i think this says it all:
i have a cylinder bored for 500cc pistons
bore was done by Bush Performance
10.5:1 compression pistons
They sound like high compression big bore pistons
- stock bore is 70mm X 57.8mm X 2cyl is 444cc
- these should be 74mm X 57.8mm X 2cyl is 497cc
 

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I think you're correct, Chris - they appear to be 12'th-over 450 pistons with high compression domes.
Here's a photo showing pistons from 500T, 5-speed 450's, and 4-speed 450, left to right. The 500T pistons have shorter skirts to compensate for the longer stroke
It would appear that your seller has just enough knowledge to be dangerous......

P1000305JPG.jpg
 

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The 500 & 450 DOHC engines are the same but different. One difference is the pistons. The wrist pin hole in the 500 is closer to the crown than on the 450. This is because the stroke on the 500 is longer, Honda used the same length rod and made up the difference in the pin location. If you put 450 pistons in a 500, piston crown and head modification will be required.
 

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The CB500T is a stroked version of the CB450
these pistons bore a 450 to 500cc

CB450 is 70mm bore 57.8mm stroke and 444cc
CB500T is 70mm bore 64.8mm stroke and 498cc

the real hat trick would be these pistons with a 500T crank 74mm bore and 64.8 stroke would be 557cc but we all know that wouldnt work...
 

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I know this is off topic, but does anyone know if gearing is different between 1973 cl & cb450T's ?
thanks
Your question might be seen by more people and get a quicker response if you start your own thread in the relevant forum.

BtW, welcome to HondaTwins.

Regards,
 

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I've seen a large number of 450's come out of the box.
Occasionally we saw a CL with a 14-tooth counter, but mainly they all had the same combo, 15/35
 
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