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CB750 k0 need exhaust check
Nurse Julie:
--- Quote from: McCabe-Thiele (Ted) on October 02, 2024, 01:53:24 PM ---I've never taken a lot of notice of exhaust pipe colour as a reliable guide for air cooled 4 cylinders.
The outer 1&4 will generally get more cooling than 2&3.
--- End quote ---
Discolouration on double skinned downpipes is a clear indicator that something isn't correct Ted and should not be ignored. Yes, if the pipes are 50 years old and the bike has had a life, slight discolouration is expected.
K2-K6:
Could be wrong, but initially thought they meant the exhaust exit pipe to judge mixture and burn.
McCabe-Thiele (Ted):
--- Quote from: Nurse Julie on October 02, 2024, 03:22:21 PM ---
--- Quote from: McCabe-Thiele (Ted) on October 02, 2024, 01:53:24 PM ---I've never taken a lot of notice of exhaust pipe colour as a reliable guide for air cooled 4 cylinders.
The outer 1&4 will generally get more cooling than 2&3.
--- End quote ---
Discolouration on double skinned downpipes is a clear indicator that something isn't correct Ted and should not be ignored. Yes, if the pipes are 50 years old and the bike has had a life, slight discolouration is expected.
--- End quote ---
The word downpipe was not used by Danny, I guessed it was the end of the exhaust pipe colour from a 20 mile run that was being referred to as brown as opposed to black or grey. I thought it odd as aside from rust brown is a new shade to me for exhaust systems. i.e.tail pipe. I've seen nice blued single skinned front pipes never a brown one though unless it was rust.
I agree with Nigel the plug colours are a more reliable than the shade of a double skinned front pipes.
Nurse Julie:
True, Danny didn't mention down pipes, that was an assumption. But I've never seen brown silencers either 🤔🤔🤔
McCabe-Thiele (Ted):
--- Quote from: Nurse Julie on October 02, 2024, 04:28:05 PM ---True, Danny didn't mention down pipes, that was an assumption. But I've never seen brown silencers either 🤔🤔🤔
--- End quote ---
Oddly enough I have - it was a blown head gasket on a water cooled engine - more like rusty water!
If he had mentioned 1 & 4 were blue that would have been a good clue.
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