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post #1 of 12 Old Jun 16th, 2006, 11:51 pm Thread Starter
 
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Tight Valve What's too Tight

Checked the valves at 12065 miles on my '05 this week, and found two intake valves tight. The one I'm concerned about is the first one in the train. It was a tight .003 . Should I be concerned about a burned valve? Fuel mileage dropped about 600 miles back, by about 4 mpg at the same elevation. I'm now getting less mileage, 38 mpg solo now, than when I was pulling my trailer which was about 40.5 mpg. All mpg is actual measured, not computer.

Need input please.

Thanks,
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post #2 of 12 Old Jun 17th, 2006, 1:02 am
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The bike has a spec for valve tolerance for a reason. If you checked them and they are not within that tolerance range, you should be concerned about damaging your engine. Get them fixed.

David Taylor
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post #3 of 12 Old Jun 17th, 2006, 3:24 am
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Rick is your mpg at the same elevation? I have found my mpgs to change at different elv. the higher elv the better mpgs. It may have nothing to do with valves being burned. When I did my 24K I had 7 tight valves and after changing buckets mpgs improved and performance improved. I dont know that I would be too concerned yet. after you replace buckets check again. Griff helped me and he was not concerned with valves being burned and stated that bike would run a lot better after readjustments.
ps my mpgs at sealevel has never been better than 38 mpgs

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post #4 of 12 Old Jun 17th, 2006, 6:02 am
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Quote:
Originally Posted by TandemCyclist
Checked the valves at 12065 miles on my '05 this week, and found two intake valves tight. The one I'm concerned about is the first one in the train. It was a tight .003 . Should I be concerned about a burned valve? Fuel mileage dropped about 600 miles back, by about 4 mpg at the same elevation. I'm now getting less mileage, 38 mpg solo now, than when I was pulling my trailer which was about 40.5 mpg. All mpg is actual measured, not computer.

Need input please.

Thanks,
Rick, the intake valve at .003 is way to tight. I doubt you have to be concerned with a burnt valve at this point. I would try to set the intake valves as loose as possible, Closer to 008 for intake and.012 for exhaust . as you witnessed the valves can become tight over time.

Pete Murray
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post #5 of 12 Old Jun 17th, 2006, 7:57 am
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Quote:
Originally Posted by TandemCyclist
Should I be concerned about a burned valve?
Need input please.

Thanks,
Rick,

Get the clearance set right. But if you actually had a burned valve - you would know it. There would be rough running and backfires into the intake system. I learned the hard way on an MGA back in the 60's trying to quiet a noisy valve train.

John
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post #6 of 12 Old Jun 17th, 2006, 9:47 am
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Quote:
Originally Posted by TandemCyclist
Checked the valves at 12065 miles on my '05 this week, and found two intake valves tight. The one I'm concerned about is the first one in the train. It was a tight .003 . Should I be concerned about a burned valve? Fuel mileage dropped about 600 miles back, by about 4 mpg at the same elevation. I'm now getting less mileage, 38 mpg solo now, than when I was pulling my trailer which was about 40.5 mpg. All mpg is actual measured, not computer.

Need input please.

Thanks,
Anything tighter than specified is too tight! Adjust them, and when possible adjust to the top of the range. Since thay always tighten as they wear, when I am already adjusting valves if one is in mid-range I will go ahead and put in the next smaller bucket, which will take it 0.001" over max, but I know that by next valve check it will likely be in range. Tight is much worse than loose.

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post #7 of 12 Old Jun 17th, 2006, 4:23 pm
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Cool Valves get tighter as they wear?

Could someone please explain this. This has been bugging me for a while now and I want to know how this can happen.

2001 K1200LTC
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post #8 of 12 Old Jun 17th, 2006, 4:52 pm
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Quote:
Originally Posted by scott122262
Could someone please explain this. This has been bugging me for a while now and I want to know how this can happen.
Hey Scott, plain and simple. Friction literally sands the parts down making them smaller. As the cam wears it gets smaller. sucking tolerances in tighter. Tighter it is, the more chance a valve won't close all the way and that causes a valve, or worse, a seat to burn.



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post #9 of 12 Old Jun 17th, 2006, 6:00 pm
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Quote:
Originally Posted by grifscoots
Hey Scott, plain and simple. Friction literally sands the parts down making them smaller. As the cam wears it gets smaller. sucking tolerances in tighter. Tighter it is, the more chance a valve won't close all the way and that causes a valve, or worse, a seat to burn.
Actually Grif, if it was cam or follower wear, the valve clearance would OPEN UP.

In actuallity, the cams and followers wear very little. The problem is that the valve seat surfaces wear in a little causing the valve to seat deeper into the head, closing up the gap.

If one ever does see clearances getting larger, there is something bad going on, like the cam lobes wearing. That is not good.

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David Shealey
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post #10 of 12 Old Jun 17th, 2006, 9:21 pm
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Well, of course you're right. 3 days in the Port Aransas sun with 6 kiddo's under the age of 6 has addled me beyond recognition. Not to mention dial up that works about as fast as fossilization. Do you know how loud that many kids can get?

I might have gotten the valve burning right, but who knows?



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post #11 of 12 Old Jun 17th, 2006, 9:37 pm Thread Starter
 
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Thanks gentlemen

I'm waiting on buckets to adjust to the high end of the range.

Thank's John Z for making me think it through on what would be occurring with a burnt valve. I guess I new that but I forget to think sometimes.

Floyd, It must be the big windscreen I have to get the bad mileage, or maybe I've been trying to keep up with you.

Now as far as the design of these bucket type valve followers, seems like a lot of friction to me. Most compact for sure.
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post #12 of 12 Old Jun 18th, 2006, 4:12 am
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Rick I managed to get in some riding yesterday and checked the computer and it read 34.5 mpg. It was windy and HOT, but that is normal for me here below sealevel. I rode down to New Orleans yesterday, did manage to get a new faceshield for my helmet. Hope everything goes together for you and Happy Fathers day.

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