Author Topic: Adjusting tappets  (Read 2683 times)

Offline McCabe-Thiele (Ted)

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Re: Adjusting tappets
« Reply #15 on: July 12, 2024, 10:09:38 PM »
I was worried about sump dilution when I rode a 100 mikes on two cylinders! Lol
Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline SeanFD

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Re: Adjusting tappets
« Reply #16 on: July 14, 2024, 08:12:25 AM »
CB750 K2 - Ridden from Belfast(SA)-2-Belfast(NI) & Belfasts, N America!
CB750 K1 - The less, said the better!
CB450 K1 - A work in progress.
CB400F Supersport - Rusty - not any more!

Offline K2-K6

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Re: Adjusting tappets
« Reply #17 on: July 14, 2024, 08:59:39 AM »
Has anyone used this tool?

https://www.ebay.co.uk/itm/203928464413

Tools like that (there's been a few design over the years) work OK but some prefer seperate. Makes it easy to hold both parts if access is restricted too.

Shouldn't be a problem,  but as with most things, comes down to personal preference in trying it out.

I find it easier to finally tighten tappets by letting the cente rotate with the securing nut for that final torque, as opposed to holding the centre absolutely still as the threads tighten on each other in conflict.
Easier to do than describe ..... but would loosely approximate to aiming for a marginally wider gap than needed, only to let that close slightly with the final tighten to then arrive at correct specification to be checked and verified without touching the locknut again.

Offline Alexrayz

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Re: Adjusting tappets
« Reply #18 on: July 14, 2024, 10:04:59 AM »
Has anyone used this tool?

https://www.ebay.co.uk/itm/203928464413

Tools like that (there's been a few design over the years) work OK but some prefer seperate. Makes it easy to hold both parts if access is restricted too.

Shouldn't be a problem,  but as with most things, comes down to personal preference in trying it out.

I find it easier to finally tighten tappets by letting the cente rotate with the securing nut for that final torque, as opposed to holding the centre absolutely still as the threads tighten on each other in conflict.
Easier to do than describe ..... but would loosely approximate to aiming for a marginally wider gap than needed, only to let that close slightly with the final tighten to then arrive at correct specification to be checked and verified without touching the locknut again.
And you manage to get 0.005mm of clearance precisely? Doing it the way you describe I never could, that’s why I went for that tool Sean showed. Kudos to you


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Offline K2-K6

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Re: Adjusting tappets
« Reply #19 on: July 14, 2024, 12:47:59 PM »
 ;D that was my second job as a kid, so long time practicing.

First was given a little brass brush and feeler gauges to clean and gap spark plugs when my father worked on our family car, dont remember if he actually used the plugs, or it was just to keep me quite and out of his way. Did feel quite grown up with that responsibility though  :)

Then on to tappets as I didn't mess up the plugs.

Taught me to weld at about 12 years old too, all oxy /acetylene then as well.

Offline Johnwebley

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Re: Adjusting tappets
« Reply #20 on: July 14, 2024, 06:46:06 PM »


  interesting  video I saw on youtube,

https://www.youtube.com/watch?v=k3qBLW_sYD8



also 
phttps://www.youtube.com/watch?v=YM15Gijr6Ag




I enjoy his videoes,I think he lives just south of Glouscester
lifelong motorcycle rider,and fan

Offline Bryanj

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Re: Adjusting tappets
« Reply #21 on: July 14, 2024, 07:09:27 PM »
Yup he is near Dursley

Offline K2-K6

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Re: Adjusting tappets
« Reply #22 on: July 14, 2024, 07:45:00 PM »
I've watched that one recently, interesting outcome and he's quite "investigative" showing his steps etc throughout. Could be skew on cam grind or some rock in rocker arm, or previous wear to give some taper in follower pad. Probably worthwhile using engineers blue to asses wear pattern in those cases. Some camshaft have the lobe peak deliberately ground "skew" to rotate the follower/bucket in distribution of wear pattern between the component.

Have to fast forward through some waffle, he does say that to himself as criticism some times "stop waffling Jim" but leaves you to zip through them yourself to things you find important.

Recently watched a plug re thread in situ as he approaches it differently to other, more common suggestions. Worthwhile watching that one too if you're contemplating the same.

Offline Alexrayz

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Re: Adjusting tappets
« Reply #23 on: July 15, 2024, 09:56:23 AM »
;D that was my second job as a kid, so long time practicing.

First was given a little brass brush and feeler gauges to clean and gap spark plugs when my father worked on our family car, dont remember if he actually used the plugs, or it was just to keep me quite and out of his way. Did feel quite grown up with that responsibility though  :)

Then on to tappets as I didn't mess up the plugs.

Taught me to weld at about 12 years old too, all oxy /acetylene then as well.
Doesnt sound like a bad childhood experience ;)


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