One pipe rich

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Jun 23, 2018 | 02:32 PM

#11

Shem77

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From: Monroe

I appreciate your advice. I understand that spark doesnt control air fuel however the timing of the spark i know can affect the mixture and exhaust. (pre- post ignition) I sprayed directly around both sides of heads on engine and found no change in idle.

Jun 23, 2018 | 02:46 PM

#12

Shem77

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From: Monroe

also, if as you say there is a intake leak in one of the pipes then why would it run rich if you say its lean?

Jun 23, 2018 | 05:20 PM

#13

Prot

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From: Lafayette, Louisiana

Quote:

Originally Posted by Shem77

also, if as you say there is a intake leak in one of the pipes then why would it run rich if you say its lean?

Because the carburetor was adjusted for the cylinder with the leak, which then caused the other one to be rich.

Jun 23, 2018 | 05:47 PM

#14

Shem77

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From: Monroe

I dont think its been adjusted since 2004 when my Grandfather added the mods. I highly doubt they would do all that upgrading dyno testing with a leaky intake. Im assuming whatever is happening has happened recently.

Jun 23, 2018 | 06:09 PM

#15

TwiZted Biker

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From: Niles Canyon Ca.

Quote:

Originally Posted by Shem77

ok, I was also told that the reason my rear plug is fouling early was that reason. Do you agree? How big of a deal is this intake? Is that just the gasket on the carb to air cleaner?

What kind of fouling ? oily wet or black soot ? Wet means you are pushing oil, rings or a valve guide, dry is running too rich but that would hit both plugs not just the rear.

Jun 23, 2018 | 06:22 PM

#16

Shem77

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From: Monroe

nice profile pic!

it is dark and sooty not oily
I know its strange that its only one and only one side of the exhaust thats rich smoke coming out

Jun 23, 2018 | 06:49 PM

#17

TwiZted Biker

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From: Niles Canyon Ca.

Look for an intake leak on the front then and unless you run true duals the left side pipe will always be cleaner, just the nature of the flow dynamics.

Jun 23, 2018 | 07:07 PM

#18

RDHIGH

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From: Winnipeg

I had a similar issue years back on an old evo- nothing to do with exhaust. Turned out my plug wires were firing intermittantly on the rear cyl- when it fired the plug- the cylinder was already loaded with extra fuel from the last intake stroke when it didnt fire the plug. Ended up with one sooty plug- the other clean. Changed plug wires with accel ones 10 years ago- never had the issue again. Just an idea.