Author Topic: Valve Adjustment - clearance  (Read 819 times)

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Offline Katsi

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Valve Adjustment - clearance
« on: April 24, 2018, 03:09:58 pm »
I just received my carbs back from Steve and he strongly suggested that while I have things apart to go ahead and check the valves.  Since I have never done this before, I am trying to read and watch everything available.  However, My Bike is a 2003 and my manual is for a 2000. 

My question is this - the manual calls for a clearance of 0.13 - 0.18 for the intake and 0.18 - 0.23 for the exhaust.  Is that the same for all years.  Again, I have never adjusted valves.

Offline Strawboss

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Re: Valve Adjustment - clearance
« Reply #1 on: April 24, 2018, 04:42:09 pm »
I would say the clearance has not changed over the years. I have an 01 and an 01 manual, I can get back to you and make definite sure as I'm doing my valves in the next week.
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Offline MAN OF BLUES

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Re: Valve Adjustment - clearance
« Reply #2 on: April 24, 2018, 07:18:49 pm »
I just received my carbs back from Steve and he strongly suggested that while I have things apart to go ahead and check the valves.  Since I have never done this before, I am trying to read and watch everything available.  However, My Bike is a 2003 and my manual is for a 2000. 

My question is this - the manual calls for a clearance of 0.13 - 0.18 for the intake and 0.18 - 0.23 for the exhaust.  Is that the same for all years.  Again, I have never adjusted valves.

Valve cam clearance is the same on all years from 86 thru '06...
Also note, those figures are in mm (millimeters)... just reminding...

I use inch feeler gages myself, and set to the larger end of the scale,
Intakes.  .005" to .007"
Exhaust side .007" to .009"
« Last Edit: April 25, 2018, 08:19:18 pm by MAN OF BLUES »

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Offline Greenie

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Re: Valve Adjustment - clearance
« Reply #3 on: April 25, 2018, 06:05:40 am »
A major time saver is rather than taking the timing cover off just make sure the cam lobe is pointing up to check/adjust the clearance. The Tech Pages has a great step by step page.

Offline Tour1

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Re: Valve Adjustment - clearance
« Reply #4 on: October 27, 2018, 02:54:39 pm »
I can't recall doing a solid lifter valve adjustment other than helping my dad work on our 1959 chevy, and it got worse before it got better.
I'm planning to do my C10 before spring.
Do the valves really seat deeper in the ports than the cams wear down and the stem tops mushroom out?
Or is the higher clearance tactic better for new valves in new cylinder heads?
My engine has way more than 12K on it going by the condition it was in whenI got it and the number of miles I've added.
Until I read this I was planning on using the minimum clearance to get the most wear before another adjustment.
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Offline connie_rider

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Re: Valve Adjustment - clearance
« Reply #5 on: October 27, 2018, 03:04:07 pm »
I use inch feeler gages myself, and set to the larger end of the scale,
Intakes.  .005" to .007"
Exhaust side .007" to .009"

+1   :great:

Watch Steve's video on valves/cams. Valve adjust is at the 15 minute mark.
Will save you a lot of time.
https://www.youtube.com/watch?v=NpeG93CqFPw&t=89s


Ride safe, Ted
« Last Edit: October 27, 2018, 03:42:13 pm by connie_rider »
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Offline Bham Greg

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Re: Valve Adjustment - clearance
« Reply #6 on: October 27, 2018, 11:48:52 pm »
Man of Blues encouraged me to do the same and it was easier than I thought it would be. Did it today and it was a first for me also. The tech page and SISF video helped a lot. The cam cover came out easier than I expected. Not sure how fussy I needed to be on how snug the feeler gauges should be. I used the .007 inch (intake) and .009 inch (exhaust) rather than the middle of the range. Relying on others' experience on that.
I found that it must have been done at least once before (bike had 24k miles when I bought it) as there were strings of silicon sealant all over. ALL valves were set too tight, from no gap to about .005 inch. Since I don't have the bike back together yet I cannot say how much of a difference it makes.
HTH.

Offline MAN OF BLUES

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Re: Valve Adjustment - clearance
« Reply #7 on: October 28, 2018, 07:13:30 pm »
yep... that would make a bike hard to start for sure...

button it up, and tell us the outcome now...
(oh, get all that silicone spooge outta there also...)  :-\ :great: :rotflmao:

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Offline DC Concours

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Re: Valve Adjustment - clearance
« Reply #8 on: October 29, 2018, 01:50:12 am »
Snug is subjective. It's a feel thing. There should be a little friction on the feelers.

When I do mine I keep my values on the loose side and my snug has the slightest of friction.

Offline Bham Greg

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Re: Valve Adjustment - clearance
« Reply #9 on: October 29, 2018, 04:10:00 pm »
. . . . Since I don't have the bike back together yet I cannot say how much of a difference it makes.
HTH.

Reporting on this thread also, . . . bike was hard to start, especially in the morning. Valve adjustment completely resolved the problem.

Offline DC Concours

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Re: Valve Adjustment - clearance
« Reply #10 on: October 29, 2018, 04:40:45 pm »
that was it...much simpler than electricity issues

Offline connie_rider

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Re: Valve Adjustment - clearance
« Reply #11 on: October 29, 2018, 07:43:32 pm »
Congratulations on finding the problem.
I didn't realize it was you that found tight valves.

Ride safe, Ted
« Last Edit: October 30, 2018, 02:32:03 pm by connie_rider »
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Offline MAN OF BLUES

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Re: Valve Adjustment - clearance
« Reply #12 on: October 29, 2018, 09:43:53 pm »
that was it...much simpler than electricity issues

 ;) ;) ;) :great: :great:

once again we see the old thing some of us keep reminding:

sometimes fuel issues are electrical..
sometime electrical issues are fuel related...
and sometimes both the above are related to actual "air" related, (i.e. valves and the air flow passages/path)

air + fuel + spark ......
3 areas that make an engine run....
start with the simple stuff, the free stuff, Inspect, and test each thing done for the results, and progress in a calculated manner thru each, crossing them off...

focus on each, and don't change 5 different things at once, from different groups... it only adds to the chaos of trying to figure "what" cured it.

good job. :beerchug: :great:

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Offline Mcfly

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Re: Valve Adjustment - clearance
« Reply #13 on: October 29, 2018, 11:11:11 pm »
I can't recall doing a solid lifter valve adjustment other than helping my dad work on our 1959 chevy, and it got worse before it got better.
I'm planning to do my C10 before spring.
Do the valves really seat deeper in the ports than the cams wear down and the stem tops mushroom out?
Or is the higher clearance tactic better for new valves in new cylinder heads?
My engine has way more than 12K on it going by the condition it was in whenI got it and the number of miles I've added.
Until I read this I was planning on using the minimum clearance to get the most wear before another adjustment.

"Tappy valves are happy valves",  I just did my valves, set them to the loose end of spec.  4 valves were below min spec
when I checked them, one was 'loose' (by .01").  My valves seem to tighten over time.  Previous adjustment I set them
right in the middle.  Previous adjustment was 11k miles ago.
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Offline The Doctor

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Re: Valve Adjustment - clearance
« Reply #14 on: October 30, 2018, 04:01:48 am »

once again we see the old thing some of us keep reminding:

sometimes fuel issues are electrical..
sometime electrical issues are fuel related...
and sometimes both the above are related to actual "air" related, (i.e. valves and the air flow passages/path)

air + fuel + spark ......
3 areas that make an engine run....
start with the simple stuff, the free stuff, Inspect, and test each thing done for the results, and progress in a calculated manner thru each, crossing them off...

focus on each, and don't change 5 different things at once, from different groups... it only adds to the chaos of trying to figure "what" cured it.



*takes notes*....
It all started on a 250...