Valve adjustment - Yamaha SCR950 Forum
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post #1 of 21 (permalink) Old 08-21-2019, 04:18 PM Thread Starter
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Valve adjustment

Anybody done their valve adjustment?

Was it difficult?
Did you re-use the valve cover gaskets?

Advice and pointers would be appreciated.
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post #2 of 21 (permalink) Old 08-21-2019, 09:32 PM
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I did a V-Star 950's (same basic engine design and parent to the Bolt we get the SCR950 from.) and it's not terribly hard.
What's a bit time consuming is taking the gas tank off to get at the inspection covers to do the adjustment.
YouTube a few Bolt tank removal videos to get an idea if you want to begin or not.

Re: Cover gaskets.
The inspection caps are held in place with a few bolts and sealed with an o-ring.
Given our bikes aren't that old, the O-rings can be reused if not damaged.

A good quality feeler gauge is helpful. So is a clean engine.
Nothing is as upsetting as opening up an engine and have a chunk of debris drop in out of seemingly nowhere!

Here are some pics from the V-Star adjustment.
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post #3 of 21 (permalink) Old 08-22-2019, 10:31 AM Thread Starter
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Eddie,
Thanks for the info, didn't know they were O rings, that makes sense. I'm ashamed to admit it but just turned 24K and haven't looked at the valves yet. " if it ain't broke don't fix it" theory. I hope to get the valves accomplished this weekend and replace the head bearing next weekend. A little nervous about the head bearing though.
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post #4 of 21 (permalink) Old 08-22-2019, 04:06 PM
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If it makes you feel any better, my other bike survived this steering bearing clean & re-grease session!
The bike stood on the center stand with boards under the engine and a few hundred round of .40S&W in the trunk for "ballast".
That's Dan Roark, my long time friend and retired aviation mechanic in the completed photo.
I worked at his Mom & Pop m/c shop for 13+ years on my days off.
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Last edited by eddie; 08-22-2019 at 04:08 PM.
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post #5 of 21 (permalink) Old 08-22-2019, 04:26 PM Thread Starter
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I'm seeing all kind of horror stories about getting the old races out. Any thoughts or comments?
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post #6 of 21 (permalink) Old 08-22-2019, 11:13 PM
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I'm seeing all kind of horror stories about getting the old races out. Any thoughts or comments?
Poppycock! Don't be afraid to take on this job if you can read a service manual AND have the mechanical aptitude AND tools. If you're lacking in ANY of those departments, take her to a shop.
As far as the valve settings go, here's a general rule of thumb that I have followed for 40 years and 29 motorcycles. If the valves aren't noisy and the bike isn't lacking power, leave them alone! I have bought several new bikes and typically sell them when I get around 25k miles on them. I have never checked or adjusted valves on any of them. I don't think that modern bikes need as much attention as, say, maybe an old Triumph. That said, it is about time for a valve check and a head retorque! But, she is 40 years old! Just my opinion. Jevers
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post #7 of 21 (permalink) Old 08-23-2019, 08:42 AM
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Originally Posted by [email protected] View Post
(snip)
As far as the valve settings go, here's a general rule of thumb that I have followed for 40 years and 29 motorcycles. If the valves aren't noisy and the bike isn't lacking power, leave them alone! I have bought several new bikes and typically sell them when I get around 25k miles on them. I have never checked or adjusted valves on any of them. I don't think that modern bikes need as much attention as, say, maybe an old Triumph. That said, it is about time for a valve check and a head retorque! But, she is 40 years old! Just my opinion. Jevers
Careful with the quiet valve theory, especially on a bike like the SCR with screw/locknut adjustment. In spec, they make a little racket. As they tighten up, the noise subsides. Quiet valves are like quiet 3 year olds: They're up to no good!
That said, modern metallurgy is quite good.
I've had several high-mile bikes come through the shop where the clearances had been set once and stayed pretty much in spec afterward. 7 of the 8 valves on my personal Yamaha 1200's were dead-on at the 1st inspection around 24,000 miles. One intake was like 0.001 out to the loose side. My veteran mechanic friend took one look and said, "Don't you dare pull that cam for that! It's fine! Leave it alone."
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post #8 of 21 (permalink) Old 08-23-2019, 10:43 AM Thread Starter
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Poppycock! Don't be afraid to take on this job if you can read a service manual AND have the mechanical aptitude AND tools. If you're lacking in ANY of those departments, take her to a shop. Jevers
I've got the manual and I believe I have the skills required, What specialty tools would I need?

Thx
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post #9 of 21 (permalink) Old 08-23-2019, 10:50 AM Thread Starter
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I've had several high-mile bikes come through the shop where the clearances had been set once and stayed pretty much in spec afterward. 7 of the 8 valves on my personal Yamaha 1200's were dead-on at the 1st inspection around 24,000 miles. One intake was like 0.001 out to the loose side. My veteran mechanic friend took one look and said, "Don't you dare pull that cam for that! It's fine! Leave it alone."
Any thoughts as to whether the SCR likes the valves loose or on the tight side?
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post #10 of 21 (permalink) Old 08-23-2019, 11:38 AM
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Quote:
Originally Posted by [email protected] View Post
Poppycock! Don't be afraid to take on this job if you can read a service manual AND have the mechanical aptitude AND tools. If you're lacking in ANY of those departments, take her to a shop. Jevers
I've got the manual and I believe I have the skills required, What specialty tools would I need?

Thx
I believe the service manual will tell you exactly what speciality tools you will need.

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