exhaust bucket sticking, cracked valve guide...bent valve?

Started by badguy, October 12, 2009, 12:13:36 PM

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badguy

BeerGarage - No problem :thumb: If you want pics of anything else while I'm in there, let me know and I'll do what I can.

Buddha - Sounds good, just curious.  When you say new seats, you mean they'd need to be ground, right?  Also, if the guides wear during use and the valve stems don't, is there really a difference between using new valves and old ones in that respect (ignoring the need to grind the valves and seats)?
2000 GS500

The Buddha

I dont believe new seats need to be re gound after installing them. Maybe lap a little.
Seats are ground to make contact at the proper location and to sorta make full contact. Sealing is what you need.
Valves too are ground to match that. Unless the valve has a lot of wear @ the face, aka, its starting to burn, you dont need new valves. In the valve vs seat game, the valve will have more wear, its hanging in the mixture, and hence runs much much hotter. It also has a chance of burning if its not hitting the seat fully due to carbon, or you're running your valves very tight etc. If its just normal wear, clean and check and cut them both and fit and check. That works well, it should last almost as much as it did originally.

Guide vs valve - The guide is brass, the valve is hardended steel. If you're running normally, the wear should be mostly in the guide. However as it wears, especially if it wears perfectly round, it will acquire a film of oil and stop wearing beyond the limit. Of course the valve in some cases has a side load and that can totally cause the guide to get egg shaped. That will not retain oil film either and it will just keep wearing.
Of course your situation is the other way you can lose a guide.

You run new valves made from better material like kibblewhite sells cos you want to cut down face and seating area wear. You wont do much for the guide vs stem with that upgrade. The guides Kibblewhite makes are almost the same as stock if I remember. But anyway, better valve material is for the seat area wear.

That is about what I know, I am not an engine builder, nor do I play one on TV and I didn't stay at the holiday Inn last night. Done and dusted.
I have asked several questions to people who where working on my head and that was what I learned.
The factory usually does not cut a 3 angle valve job when new. They do a single angle. 3 is better, 5 is even better, but the 5 is so much harder to cut, and the gain from 3 to 5 is so small, none but the big $$$$ race teams do it.

Cool.
Buddha.
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badguy

Thanks for the information  :cheers:

How long do you think it might take to find that head you mentioned and/or get it sorted out?
2000 GS500

The Buddha

If I didn't have to pull my truck's front end apart, I'd have it by now.
I am shooting for tommorow.
I'll let you know. Monday latest.
Cool.
Buddha.
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I run a business based on other people's junk.
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badguy

Cool.  No huge rush since I have a bike to ride in the meantime.  I appreciate it!
2000 GS500

The Buddha

Grrr, just got home. I will ahve to tommorow night.
Cool.
Buddha.
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I run a business based on other people's junk.
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badguy

Yo Buddha, any word on the head?

When I said "no huge rush" I didn't mean I wanted it for Christmas :icon_mrgreen:
2000 GS500

The Buddha

Not yet, but on its trail. Its in a small 4X8 area in my garage ... however you've not seen this garage, you will not believe what its got in that 4X8 area.
I found the caps etc ...
Cool.
Buddha.
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I run a business based on other people's junk.
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badguy

Oh I know that a lot can fit in a 4x8 area...especially depending on how big that missing third dimension is...
2000 GS500

The Buddha

400 ... yup ... low flying planes circle around it.
Cool.
Buddha.
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I run a business based on other people's junk.
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badguy

2000 GS500

The Buddha

Gaaa ... sorry I am not finding it. 6 months ago I had the thing in my hand but didn't find the cam caps.
I'll prolly find it in a month when I upend the whole garage though.
Cool.
Buddha.
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I run a business based on other people's junk.
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badguy

2000 GS500

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