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CB750 k0 need exhaust check

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dannycantley:
Hi, I just test drove my K0 for 30 miles for the first time. When I checked again, I noticed that the exhaust pipes 2 and 3 were not brown, it looks like the bike is running lean, but the bike runs fine.

Is that normal? Thanks

K2-K6:
Welcome to the forum.

It would be useful to also check the plug colours in getting more information in making assessment.

They can be set rightly or wrongly to make the combustion show a little different from one cylinder to another.

Worthwhile to check plugs before going further, 30 miles should be enough to at least show a competent burn characteristic and overall picture.

McCabe-Thiele (Ted):
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.

Bryanj:
If they are Honda pipes they shouldnt discolour anyway as they are double skinned

Nurse Julie:
Agree with Bryan. If they are double skinned chrome , like Honda OEM or, 300/341 aftermarket double skinned, the downpipes should not discolour. If they have gone brown, the bike is running very, very lean, ie, far too hot.
If they are aftermarket single skinned Stainless Steel, they will discolour at any temperature

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