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Discussion Starter · #1 ·
Hello everyone, I have a lil problem with my 1990 kawi zx6d1 (ninja). When i run the bike for like 10 min the exhaust manifolds turn cherry red why is this action happening and what could it be thats turning the pipes cherry?

I have checked for sprak< found one dead coil, replaced with a used one. next change sprak plugs and rebuilt all for carburators. also reset the computer disconect the battery. oh one last thing I filled the bike with 110 race fuel (ran like a rocket) but later drained all of it out and flushed the whole fuel system with regular 93 octane.
 

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Discussion Starter · #4 ·
Hello everyone, I have a lil problem with my 1990 kawi zx6d1 (ninja). When i run the bike for like 10 min the exhaust manifolds turn cherry red why is this action happening and what could it be thats turning the pipes cherry?

I have checked for sprak< found one dead coil, replaced with a used one. next change sprak plugs and rebuilt all for carburators. also reset the computer disconect the battery. oh one last thing I filled the bike with 110 race fuel (ran like a rocket) but later drained all of it out and flushed the whole fuel system with regular 93 octane.
no catalitic converter full muzzy exhaust!
 

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The Indifference Engine
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Are you riding or just idling? Sounds like you're running awfully lean.
 

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Yup has to be lean
 

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^^^^
Agree with the above statement.
Also, and I could be wrong, but 110 race fuel has a lower burning point
than 91 octane. My bike is Turbo charged and the only time I run 110
is when the boost pressure is raised, controls pre detonation in the cylinders.:)
 

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The Indifference Engine
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^^^^
Agree with the above statement.
Also, and I could be wrong, but 110 race fuel has a lower burning point
than 91 octane. My bike is Turbo charged and the only time I run 110
is when the boost pressure is raised, controls pre detonation in the cylinders.:)
It has a greater resistance to precombustion caused by compression.
 

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Definitely need to go through your bike, running that lean is no good. If the carbs were never rejetted after the exhaust upgrade that needs to be done.
 

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The Indifference Engine
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Ah, I'd assume intake leak between the carb and the cylinder.
 
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