I have 1983 R100 no history,18K dual plugged.There appears to be about 1/8"+ adj.on one and 1/8"-on the other exhuast valves.I,m aware of the seat problem.I'm looking for recomendations to have the work done and does anyone have experence dealing with Motro Works Pro.Machining,adv.in ABC,they look to have a quick turn around.Should I tear it down or just go for the valve job?
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Valve Job:Recomendations
- Thread starter 140008
- Start date
Do you have any history or data points of the clearance closing up? That's what I'd base my decision on. If the gap began to close up rapidly, say every 500 miles, then I'd bite the bullet and do it. But if not, I'd be inclined to ride and check. At 18K miles, you're on the low end of the problem range. The 1000cc bikes were more prone to the problem, although my Dad's '81 R100RT went 65K miles with no problems...he then traded up to a KLT.
Jeff488
Aspiring Profligate
I had mine done by them last year. Very satisfied with their work.
Darryl Cainey
Sir Darby
Hill Headworks,
615 Northwest 45th Street,
Seattle, WA
98107
5 years ago I had them install:
unleaded vave seats
4 new valve guides
4 new valves
valve job install
bead blast heads
repair one rocker stud, helicoil
$350 including shipping to NY
615 Northwest 45th Street,
Seattle, WA
98107
5 years ago I had them install:
unleaded vave seats
4 new valve guides
4 new valves
valve job install
bead blast heads
repair one rocker stud, helicoil
$350 including shipping to NY
M
mymindsok
Guest
I recently sold the 1983 R100RS that that I rode Coast-to-coast in 2009.
When I bought the bike, we did a very thorough mechanical refurbish and didn't see anything that might have been a serious problem but a few thousand fast miles later, the right head had developed a badly recessed exhaust valve.
Heres the head. The intake valve loks fine but the exhaust valve is on it's way to China!:
Heres whats left of the seat:
Heres the valve:
Luckily, I pulled the bike into the Airhead tent at the National Rally because I thought it needed a tune-up and one of the guys looked into the head using a flashlight and noticed the recessed valve. No wonder it was running so badly and additional 1K miles at my 80 mph cruise speed, would have seen the valve ingested and a lot of expensive damage, a long way from home.
The 1983 R100 engines are known for developing recessed exhaust valves, so it's kinda, "Pay me now or pay me later", so don't fool around. If you intend to keep the bike, pull your plugs and look at the valves using an inspection light. If you can see a valve recessing, send both heads out to be refurbished as soon as you can afford to do so. You'll almost certainly want new valves, seats, springs, etc. If you don't see anything alarming, I'd still pull the offending head and take a close look at it.
If MR CAINEY actually had his heads rebuilt for $350, thats an astoundingly good price! I had the Big Valve heads on my current R100 engine completely rebuilt using Black Diamond Valves and all bells and whistles and it cost me about twice that much.
You should get some estimates and compare prices but have the work done by someone you who knows what they're doing and that you know you can trust to stand behind the job.
PS; I don't use Ted Porter but he has a terrific reputation out here on the west Coast. I'll probably have him dual plug my heads when the time comes.
When I bought the bike, we did a very thorough mechanical refurbish and didn't see anything that might have been a serious problem but a few thousand fast miles later, the right head had developed a badly recessed exhaust valve.
Heres the head. The intake valve loks fine but the exhaust valve is on it's way to China!:
Heres whats left of the seat:
Heres the valve:
Luckily, I pulled the bike into the Airhead tent at the National Rally because I thought it needed a tune-up and one of the guys looked into the head using a flashlight and noticed the recessed valve. No wonder it was running so badly and additional 1K miles at my 80 mph cruise speed, would have seen the valve ingested and a lot of expensive damage, a long way from home.
The 1983 R100 engines are known for developing recessed exhaust valves, so it's kinda, "Pay me now or pay me later", so don't fool around. If you intend to keep the bike, pull your plugs and look at the valves using an inspection light. If you can see a valve recessing, send both heads out to be refurbished as soon as you can afford to do so. You'll almost certainly want new valves, seats, springs, etc. If you don't see anything alarming, I'd still pull the offending head and take a close look at it.
If MR CAINEY actually had his heads rebuilt for $350, thats an astoundingly good price! I had the Big Valve heads on my current R100 engine completely rebuilt using Black Diamond Valves and all bells and whistles and it cost me about twice that much.
You should get some estimates and compare prices but have the work done by someone you who knows what they're doing and that you know you can trust to stand behind the job.
PS; I don't use Ted Porter but he has a terrific reputation out here on the west Coast. I'll probably have him dual plug my heads when the time comes.
