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Old 12-28-2012, 06:56 AM   #1
K6KTM OP
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Pyns blog and Valve clearance

He's a busy chap at the moment so I put this to the forum......

Quote "just to make sure they are settled and the clearances are set at their optimum for longevity. Intakes on the large side of the tolerance exhaust on the tighter side of the tolerance. This is from my experience with these motors that the intakes tighten up as the valves bed into the seats and the exhausts tend to loosen off as the carbon deposits on the valve and seat."

Question for the people that have done the clearance on there 990 motors did you find the same, that the exhaust were on the large side so needed a thicker shim. I only ask because I'm doing mine at the moment and the exhausts are on the larger side so they could go larger still not tighten up?

K6KTM screwed with this post 12-28-2012 at 07:09 AM
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Old 12-28-2012, 07:08 AM   #2
Steveman
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Quote:
Originally Posted by K6KTM View Post
He's a busy chap at the moment so I put this to the forum......

Quote "just to make sure they are settled and the clearances are set at their optimum for longevity. Intakes on the large side of the tolerance exhaust on the tighter side of the tolerance. This is from my experience with these motors that the intakes tighten up as the valves bed into the seats and the exhausts tend to loosen off as the carbon deposits on the valve and seat."

Question for the people that have done the clearance on there 990 motors did you find the same, that the exhaust were on the large side so needed a thicker shim. I only ask because I'm doing mine at the moment.
Cant confirm that, on my 990 all valves where a little tight. Usually one adjusts the valves to the biggest value inside limits. At least I do...
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Old 12-28-2012, 10:45 AM   #3
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I have had the odd experience of having the front intakes slightly loosen, while all other valves slightly tightened.

I remeasured several times to make sure of the gap, and unless I managed to mis-measure on my two previous valve checks, it has grown by .001 in.
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Old 12-28-2012, 01:02 PM   #4
kamanya
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Mostly static

But...


This is the journey that my valves have taken over the Km's.

I only know their journey from the time my warranty ran out. The big fluctuations in the beginning was from my heads being reworked from a burnt piston and bent valves... The reversal on 3 of them @ the 25k mark I think was bad measuring.

The last measurements may also have been out as I was swapping it out for a refreshed 990 and I was just curious.

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Old 12-28-2012, 01:05 PM   #5
Peanuts
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Whats the story with the burnt piston and bent valves??
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Old 12-28-2012, 05:50 PM   #6
kamanya
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Whats the story with the burnt piston and bent valves??
http://www.advrider.com/forums/showt...ighlight=Devil
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Old 12-29-2012, 01:48 AM   #7
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Originally Posted by kamanya View Post
Interesting.... well written, too :)

I keep meaning to dyno my 990 now I feel I have a good map, that will be one of the first post hibernation tasks ;)
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