Valve adjustment tip. - Yamaha Star Stryker Motorcycle Forum
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Old 04-23-2016, 03:02 PM   #1 (permalink)
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Default Valve adjustment tip.

If you're using the 90 degree Yamaha tool here's a tip to make it easier to do a valve adjustment. As you may know the adjuster screws are hard to reach with feeler gauges in place. It may also work with the two piece adjuster set as well.

Here is an alternative.

The thread pitch on the adjusters is 0.8mm. 360 degrees of rotation moves the screw that far (0.8mm). Using that as a starting point you can get the clearances very close by loosening the lock nuts, and gently moving the adjusting tool clockwise until the screw just touches the valve tip.

For the intake valves rotate the tool 45 degrees counterclockwise and tighten the lock nut. For the exhaust use 90 degrees of counterclockwise motion and do the same.

This will give you an intake clearance of 0.1mm or about 0.004" right in the middle of the range. The exhaust adjuster 90 degree rotation will result in a clearance of 0.2mm or about 0.008". While this is just a tiny bit greater than the called for clearance it will actually work just fine compared to the Yamaha recommended clearance of 0.0071".

These two rotations (45 degrees and 90 degrees) are easy to visualize quite accurately. Try this and measure the clearances when you're done and you'll be amazed at the accuracy and ease compared to using one or two feeler gauges and the resultant clutter they introduce, along with the other tools.

Hope this is useful information and helps with a somewhat difficult task.

Ray Nielsen, in Minneapolis and enjoying almost summer like weather.
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Old 04-23-2016, 05:03 PM   #2 (permalink)
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Cool tip Thank You! After 35 years of adjusting valves it never occur to me that you can use the pitch of the adjustment screw as the reference to adjust the gap. You can actually apply this to any engine that valves you have to adjust.
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Old 04-23-2016, 05:32 PM   #3 (permalink)
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Yea, that pitch trick is obvious, but I never gave it a thought either!! Thanks for the tip!
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Old 04-24-2016, 01:00 PM   #4 (permalink)
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Sure could save some time! Nice, I'd like to add this quote from a brutha from another mother as it is great advice also!

Quote:
Originally Posted by sscottab View Post
as valves wear they have less clearance making them tighter so when adjusting valves always go to the max clearance giving you longer before needing to do it again
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Old 04-26-2016, 01:59 PM   #5 (permalink)
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that's some great logic
thanks,
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Old 06-05-2016, 10:40 AM   #6 (permalink)
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Default Valve adjustment tool follow tip..

I couldn't find a Yamaha dealer who could supply the tool so I ordered it from <www.partzilla.com> under the Suzuki part number 09917-10410 - it's the same tool,

Their price was the lowest i could find at $18.55 + $7.95 S & H for a total of $26.50. Had it in a week,

Ray Nielsen, in Minneapolis.
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Old 06-05-2016, 01:24 PM   #7 (permalink)
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Man! What a gold nugget, thanks for sharing. Good price on the tool also
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Old 07-11-2017, 09:49 AM   #8 (permalink)
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Quote:
Originally Posted by Ray Nielsen View Post
I couldn't find a Yamaha dealer who could supply the tool so I ordered it from <www.partzilla.com> under the Suzuki part number 09917-10410 - it's the same tool,

Their price was the lowest i could find at $18.55 + $7.95 S & H for a total of $26.50. Had it in a week,

Ray Nielsen, in Minneapolis.
Thanks for sharing Ray! Just ordered mine. Planning to get to the valves this weekend.
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