Black Bomber valve clearances.

[royhall]

Does anyone know the correct procedure for setting the valve clearances on a 450 Black Bomber. I have 3 manuals and they all tell a different tale. I think I have it right but best to make sure before I trash something. Cheers.

[royhall]

I have got myself completely confused over the valve clearances on the Bomber. I have got the cams in correctly ie. both camshaft marks on the right hand side are correct on the LT mark, and that checks out every two turns of the crank. Cam chain tensioner fitted and set. Now when it comes to valve clearance I have done LT mark with the cam marks aligned then 360deg round and set the left side. Now the confusion, I turn the crank to the T mark and set one right hand side but the other side wont adjust enough, I have to go round 360deg again to set that one. Is this correct? I was expecting to set both right hand side on the one mark.

This is what the Honda manual says about it. I have no idea what they mean by type 1 and 2? The instructions in the Clymer manual don't appear to work and Haynes is a two line waste of time. Any help on this would be greatly appreciated.

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[Bryanj]

That description suggests to me that early engines were 180 cranks whilst later were 360 BUT i have never worked on a "Bomer" so do not profess to know for certain if cranks, cams etc were different.

Basic way to set tappets/valve clearance is to get the piston on TDC(pencil down plug hole) with both valves for that cylinder moving then rotate engine one full turn to TDC again and that is TDC compression which is where you set clearance.

[Trigger]

As Bryan said, back to oldschool. Rotate the crank clockwise and watch the inlet valve open and as it comes to close watch the piston come to TDC 

[K2-K6]

Agree with Bryan,  looks like they are giving instruction to cover two different crank offsets.

Any four stroke cylinder in isolation should have both valves completely closed at TDC for the compression stroke "of that specific cylinder" you should be able to set each one with that criteria and base circle of each cam lobe would be next to followers.

Manuals on any engine try to give you the least amount of crank turns to accommodate the setting,  but the wording can often confuse a sometimes simple task.

[K2-K6]

Apologies,  crossed over with Trigger there while typing

[Trigger]

Apologies,  crossed over with Trigger there while typing

NOOOO, Not across over ! Is that the same as a cross flow    I will just check de manuel 

[royhall]

That description suggests to me that early engines were 180 cranks whilst later were 360 BUT i have never worked on a "Bomer" so do not profess to know for certain if cranks, cams etc were different.

Basic way to set tappets/valve clearance is to get the piston on TDC(pencil down plug hole) with both valves for that cylinder moving then rotate engine one full turn to TDC again and that is TDC compression which is where you set clearance.

Tried that Bryan. It appears that the 450 has to be set on a certain position on the camshaft, outside that position there is no enough adjustment to set the clearance. Tried to set the clearance on the base circle opposite the lobe, again not enough adjustment. Trigger, the engine wont turn clockwise only anti-clockwise. The next question about the Honda manual description of setting the right side is 180 or 360deg from where? This must be an easy task, am I just being thick. Cheers.

[Bryanj]

You aint being thick, its the japanese to english translation which has got better since the 60's. With the piston at TDC (Tmark) the cam followers should be on the base circle, if you cant get a clearance there something is mechanicaly off.
As to manuel i aint watched Faulty Towers for a long time now, must get out the dvds!

[Nurse Julie]

Why won't the engine turn clockwise Roy?

[royhall]

It's a 450 Julie it turns from the left of the engine not the right as per a 4 cylinder.

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[Nurse Julie]

It's a 450 Julie it turns from the left of the engine not the right as per a 4 cylinder.

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Ah, got you 👍

[AshimotoK0]

Did you see the MCN CB500T Honda Training feature Roy in my Dropbox

Sorry not in Dropbox ... its here

http://www.sohc.co.uk/index.php/topic,19305.msg170703.html#msg170703

[royhall]

Thanks Ash I shall give that a full read tomorrow. Had a quick look at it and left/right of the engine is as viewed from the front in that write up. That may be the reason as I am doing it as per sitting on the bike. Could it be that simple, lets hope.

[royhall]

After a real good look at this problem I think I have found the issue.

First of all left and right is as sitting on the bike not from the front as per Ash's MCM 500T article. It was easy to verify as at the LT mark only one piston is at TDC so that's the left side, confusion sorted.

The problem is that the right exhaust valve will not set when it should. For those that were reading my build thread you will know that the cam and followers were reground by Newman Cams. Looking at it (hard to measure with it fitted) they have taken way too much meat off the right hand exhaust follower and taken it way out of tolerance. So a new follower is required at £105 delivered (ouch) to fix the problem.

The settings are therefore as per the Clymer manual as mentioned earlier.

Anyone got a good condition 450 cam follower going spare. Cash or donation to the site waiting. Cheers.