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@berto avatar
UTC

Molto Verboso
2006 LX150 (carbed) | 2007 GT200
Joined: UTC
Posts: 1915
Location: Toronto
 
Molto Verboso
@berto avatar
2006 LX150 (carbed) | 2007 GT200
Joined: UTC
Posts: 1915
Location: Toronto
UTC quote
I removed the intake manifold to replace it. While I had it off, I noticed some yellow buildup on the intake valve. Is this anything to be concerned about?
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
@mjrally avatar
UTC

Veni, Vidi, Posti
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: UTC
Posts: 5073
Location: Oceanside, CA
 
Veni, Vidi, Posti
@mjrally avatar
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: UTC
Posts: 5073
Location: Oceanside, CA
UTC quote
As long as the sealing surfaces of the valve is still good I wouldn't worry about it. If you still have the manifold off see if you can scrape some of the yellow stuff off.
@andythebuilder avatar
UTC

Addicted
250 gts, nitroed zip 69cc " the teenager", 200 now 300 lc zip "all grown up"
Joined: UTC
Posts: 721
Location: Cheshire
 
Addicted
@andythebuilder avatar
250 gts, nitroed zip 69cc " the teenager", 200 now 300 lc zip "all grown up"
Joined: UTC
Posts: 721
Location: Cheshire
UTC quote
all alloy head
MJRally wrote:
As long as the sealing surfaces of the valve is still good I wouldn't worry about it. If you still have the manifold off see if you can scrape some of the yellow stuff off. Maybe rust on the cast iron barrel?
Hi buddy,
it's not rust the cylinder head is cast from alloy and rust on the valves would indicate a major problem on an a.c motor (there's no water to leak and oxidise)
That is a sulphur build up and is a natural deposit from combustion, but it should be a mid brown colour so the fact it's yellow confirms you have been running very lean.
Cheers Andy.
@mjrally avatar
UTC

Veni, Vidi, Posti
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: UTC
Posts: 5073
Location: Oceanside, CA
 
Veni, Vidi, Posti
@mjrally avatar
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 90 V5N 50, 01 ET2, 2015 HD Road Glide Special
Joined: UTC
Posts: 5073
Location: Oceanside, CA
UTC quote
Yep. I thought about it for a minute and remembered it was an aluminum head. I then deleted my comment about rust but you were too quick on the reply Razz emoticon

Never knew about sulphur deposits.
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