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Discussion Starter · #1 ·
Hello everybody!

I'm back with new issues :)
So my engine was already apart so I figured, let's change the cam chain. That should be easy and I have already done it with some help....
Nope.

I first tried to drive the chain with the current one. Didn't work out... I had to remove the cam shafts to pull the chains out...

So now I reinstalled the cam shafts. The manual says "make sure they rotate freely" which they do.. until the lobe hits the cam follower and then it won't go further by hand. I'm guessing that's normal and then you need some actual power to push in a valve? What's annoying is that I can't put them in a rotation that would align the timing marks. So I need try and predict how everything is going to rotate together so that the timing marks align...

Then I tried installing the chain, but when I do, I still can't make it fully rotate and I'm afraid to use too much strength.

So questions:
- is there a right way to install the cam shafts?
- should a cam shaft rotate easily 360 degrees?
- should I be able to have the timing marks aligned before installing the cam chain?
- the manual (https://drive.google.com/file/d/0B8RLEMngUB63U3VodUVRMnpsdTA/view) specifies to have the rotor on the LT mark. I read somewhere that it should be on the off stroke? is that correct? Any easy way to detect that?


Thanks for the help...
Guillaume
 

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G, while it seems simple - and it actually is - of course, it has to be done properly or you risk causing damage. First, turn the engine over until in between the two TDC (top dead center) marks, LT and T. The reason you want to do this first is so you can use a screwdriver to "lever" the exhaust cam into the proper position to line up the timing mark on it without pushing a valve into the left piston since it is pretty easy to bend one. Lever the cam sprocket against the bottom opening of the valve cover area until the timing mark lines up with the mark on the engine's right cam bearing. Then, with slack in the cam chain (and the ends tied off with wire or zip ties to keep it from falling into the bottom end), rotate the crankshaft to bring the engine back to LT (stroke doesn't matter as the cams aren't in play yet, so there is no "compression" stroke until the cams are working with the crank). The exhaust cam will sit still as you thread the cam chain across the inside of the head to the intake side. After you have the unconnected ends of the cam chain arranged in the intake valve cover opening, you then use a screwdriver to lever the intake cam upward to line up the timing mark there and then connect the chain with the master link.
 

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Discussion Starter · #3 ·
Thank you for the detailed instructions! I could not find a video on how to do this anywhere... I'll try this ASAP.
 

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Discussion Starter · #5 ·
Bill and Tom, thank you so much :)

Tom the screw driver lever + positioning the engine between the 2 TDCs saved me.
Bill that pdf is awesome. I found it on https://www.hondatwins.net/forums/5...mshaft-replacement-questions-please-help.html and it was super helpful.

I was able to put the cam chain on. Took me a couple time but it worked out :)

I know there has been a lot of discussion about which cam chain to get. If anybody is looking for a new cam chain, the common motor one (https://www.common-motor.com/honda-450-cam-chain) seems to work just fine. The marks align perfectly.

Thanks!
 

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Bill and Tom, thank you so much :)

Tom the screw driver lever + positioning the engine between the 2 TDCs saved me.
Bill that pdf is awesome. I found it on https://www.hondatwins.net/forums/5...mshaft-replacement-questions-please-help.html and it was super helpful.

I was able to put the cam chain on. Took me a couple time but it worked out :)

I know there has been a lot of discussion about which cam chain to get. If anybody is looking for a new cam chain, the common motor one (https://www.common-motor.com/honda-450-cam-chain) seems to work just fine. The marks align perfectly.

Thanks!


All I could see was JAPAN stamped on that chain, not sure if it's DID or not otherwise.
At $55, that's not exactly cheap. Especially when I can get the real deal DID chain from Frank for much less and be sure it's the right chain

https://www.ebay.com/itm/Honda-CB-4...e=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649
 
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