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Discussion Starter #1
I can't seem to get the valves adjust to even a 0.0015, no matter which direction I turn the adjustment screw. What am I doing wrong? Oh I do aline the timing marks and the LT, then turn the crank 180 degrees clockwise. Anything missing?
 

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Sensei
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Re: Value adjustments again

Yes...Why are you turning the crankshaft 180 degrees clockwise?
Set the crank to LT on the compression stroke (left intake valve should have closed a bit before you reach the index)... Hold the crank there and adjust both the left valves.
Now, turn the crank 180 counterclockwise to the T mark... Hold it there and adjust both right valves......
 

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Discussion Starter #3
Re: Value adjustments again

Now I feel like a dummie. I thought I read it somewhere. If I find it I will post it.
Thanks
 

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Sensei
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Re: Value adjustments again

Easy mistake... between turning the crank 180 after setting the left valve clearances, and NOT turning the adjuster MORE than 180, it does sometimes "blur"....
 

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Discussion Starter #5
Re: Value adjustments again

Now I align the cam marks and the LT mark and then turn to crank 360 degrees to LT again and then adjust the left side. Then another 180 degrees clockwise for the right side?????????
 

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Sensei
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Re: Value adjustments again

NO... LT on compression stroke set left valves...180 CCW to T set right valves
Don't turn the crank clockwise!
 

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Discussion Starter #7
Re: Value adjustments again

Now the books has it different but I trust your knowledge more then the books.
At the point when all marks are lined up is that considered TDC?
 

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Re: Value adjustments again

petewag said:
Now the books has it different but I trust your knowledge more then the books.
At the point when all marks are lined up is that considered TDC?
I trust Steve more than any bloody book too.

The only marks to line up are the alternator mark and it's index.
Like Steve says, you gotta' be on compression stroke, and don't turn the alternator clockwise.
And set the valves to 0.002", not 0.0012".

Sounds like you're looking at the Clymer manual - no wonder you're confused.
 

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Sensei
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Re: Value adjustments again

Yes, when ALL the marks (LT and its index, and the cam journal lines and cam marks) line up the left piston is at A top dead center point... BUT, there are TWO such points in the engines four stroke cycle for each cylinder.... You HAVE to be on the one that is the COMPRESSION STROKE for the cylinder you are adjusting the valves on....
Watch the intake valve for the left cylinder ..... As soon as it fully closes, the very next time the "LT" line on the rotor aligns with the index, the engine is at TDC on the compression stroke for the LEFT cylinder
 

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To be precise, the marks on the cams and journals actually line up at the top of the exhaust stroke, not compression stroke.
Honda did this, I think, to make it possible for one guy to do the cam timing - if it were done on compression stroke, the tendency of a 450 (or 350) to "run by" the LT mark when you rotate the alternator would cause the need for extra hands or some sort of tool to hold the alternator.
So it's (the cam timing, not ignition timing) done on the "off stroke" to reduce the run by tendency.
 

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petewag said:
This one of the locations where it states to line up the marks and then turn the crank ccw 360

http://www.cb450stuff.com/manual/index.htm#Valve
Oh, that's the User Manual - they tell it correctly.
They tell you that when the marks on the cam and journals line up, you're NOT at the right place.
 

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Yep...It IS confusing....That is a TDC point, (exhaust stroke) and you need to go 360 to get it to TDC on the COMPRESSION stroke..... If you use the intake valve as your guide, you WILL ALREADY be on the compression stroke, so the "extra 360" is unnecessary.... Set left valves, and then go 180 CCW to set right valves
 

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Hopefully, I haven't confused the issue, and you now have the valves correctly adjusted........Please keep us in the loop........ Steve
 

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Discussion Starter #17
Going to work on it tonight. The weekend was for cutting the tall grass and mother's day.
Thanks again
 

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Shoot me an email - jar AT teamquest DOT come and I'll send you a .pdf of the "making it easy" article regarding valve adjustments.

Same for anyone else that's interested.

Regards,
Joe
 
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