Topic: valve clearance question

[rab1dwolf]

Ok I read a bunch of different threads on here and had a question(1982 cb650sc) since i'm now getting a loud clicking noise from the top end:

My book says to set it to .002 (in) .003 (out)

I read hondamans thing on here recommending that I set the out to .005 so I did. and left the in at .002.

my book says to put 1 at TDC and perform the adjustments on certain valves and then rotate 360 degrees to put 4 at tdc and do the others, but isnt going 360 just putting it back where it was?

[scondon]

No, the cam spins at half the rate of the crank.  1 full revolution of the crank= 1/2 revolution of the cam.

[rab1dwolf]

ahhhh.....see now something like that I would figure would be good to have in the book....

[nickjtc]

It might still be 'noisy' after the adjustment. Mine is always noisy, no matter how often I adjust the valves, and whatever the clearance I set them at. Rode the bike with them set at .005/.008 for over a thousand kms once. Don't ask.

[oldfart]

This engine is not supposed to be noisy.  Most of the noise people think is valves on this engine is actually cam chain.  This engine has the noisiest cam chain of any Honda made.  There is a special procedure for adjusting the cam chain that is not in the manual.  No, it is not automatic.  No, it is not done with the engine running.  It is done by hand, while turning the crankshaft. 

[scondon]

This engine is not supposed to be noisy. Most of the noise people think is valves on this engine is actually cam chain. This engine has the noisiest cam chain of any Honda made. There is a special procedure for adjusting the cam chain that is not in the manual. No, it is not automatic. No, it is not done with the engine running. It is done by hand, while turning the crankshaft.

    Is this procedure outlined at The Motorcycle Project?

[rab1dwolf]

actually i found out the problem when i went to redo the valves.....

the exhaust valve on #1 had the locknut and screw adjuster come loose and fell off underneath the actual valve springs.

Somehow by the grace of god it seems to not have damaged anything when it did it....I took apart the valve and insoected everything.  I'm going to regap everything tomorrow and make sure those succkers are TIGHT and see what I get.


on a side note does changing your valve clearances change how your exhaust sounds? like deeper more bass like etc?

[oldfart]

This engine is not supposed to be noisy. Most of the noise people think is valves on this engine is actually cam chain. This engine has the noisiest cam chain of any Honda made. There is a special procedure for adjusting the cam chain that is not in the manual. No, it is not automatic. No, it is not done with the engine running. It is done by hand, while turning the crankshaft.

    Is this procedure outlined at The Motorcycle Project?

Yes.  The procedure is outlined withing the article called "The Great American Head Gasket Caper."   Middle of the last paragraph. 

[scondon]

This engine is not supposed to be noisy. Most of the noise people think is valves on this engine is actually cam chain. This engine has the noisiest cam chain of any Honda made. There is a special procedure for adjusting the cam chain that is not in the manual. No, it is not automatic. No, it is not done with the engine running. It is done by hand, while turning the crankshaft.

    Is this procedure outlined at The Motorcycle Project?

Yes.  The procedure is outlined withing the article called "The Great American Head Gasket Caper."   Middle of the last paragraph.

    Ahhh, like a good book, always worth another read

[nickjtc]

I'm going to regap everything tomorrow and make sure those succkers are TIGHT and see what I get.

Can't remember what the exact torque values are supposed to be (manual is at home), but don't tighten them up too much!

Anyone know the torque values for the lock nuts?

[Einyodeler]

I'm going to regap everything tomorrow and make sure those succkers are TIGHT and see what I get.

Can't remember what the exact torque values are supposed to be (manual is at home), but don't tighten them up too much!

Anyone know the torque values for the lock nuts?

Torque values for the tappet adjusting nuts are 8.0 - 10.8 lbs/ft  or  1.1 - 1.8 kg/m.

[Ibsen]

I'm going to regap everything tomorrow and make sure those succkers are TIGHT and see what I get.

Can't remember what the exact torque values are supposed to be (manual is at home), but don't tighten them up too much!

Anyone know the torque values for the lock nuts?

It's 9-12 ft-lb./12-16Nm/1.2-1.6kg-m according to the Honda workshop manual for the 650.

Oldfarts method for adjsuting the cam chain makes a lot more sense than what's described in the manual. I also belive one of the other members, an old Honda mechanic, wrote that he used a wrench on the crank end nut and put pressure on it whilst he loosened the adjuster nut and tightened it.

I have never been able to see how the method described in the Haynes manual would work btw. It says that you are supposed to turn the crankshaft at least 5 rounds while loosening and tightening the adjuster nut.
And be careful when tightening the adjuster nut. The bolt is very fragile. Don't ask me how I know.

[rab1dwolf]

consider i have to use that finky tool on the tappets I have no idea how much it is.


I know its gotta be pretty low I am notriously weak at stuff like that and usually cant even get max value on alot of stuff when i do it by hand:)