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Old 07-18-2012, 07:16 PM   #1 (permalink)
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Johnny 5 - '81 Honda Cm400e
90 day: 42.86 mpg (US)

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reading plugs.


#1 200 miles.

#2 also 200 miles

and #3 also 200 miles

all the same plug wiped off between each jetting

which would you run?

i wanna see if im right.

all ran at 65-75mph to work and back.
\this is on my motorcycle 1981 cm400e

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Old 07-18-2012, 07:41 PM   #2 (permalink)
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CM400E - '81 Honda CM400E
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#1 looks the best to me.
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Old 07-18-2012, 08:36 PM   #3 (permalink)
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It's somewhat hard to tell just based on pictures, but #1 looks the best and #3 looks like it's clearly the worst.
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Old 07-18-2012, 09:14 PM   #4 (permalink)
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#1 is almost too good for an air cooled bike. As long as you don't have problems with it being too lean it looks great. The angle and distance differences make it hard to really compare, but #2 may be your best bet in an air cooled bike. If it was liquid cooled I would like #1 better, but air cooled needs to run just a hair richer unless you do not have extreme climate conditions. 1 looks like a plug out of a modern closed loop EFI system.

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Old 07-18-2012, 10:07 PM   #5 (permalink)
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Join Date: Mar 2008
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Johnny 5 - '81 Honda Cm400e
90 day: 42.86 mpg (US)

Da bike - '06 Honda Shadow Vlx deluxe
90 day: 59.47 mpg (US)
Thanks: 18
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one was 72 oem primary with 10%etoh gas it was lean and bogged right before the secondary kicked in.

second is 75 main. ran great sorry for the bad pic

third is 78 main, too rich didn't need choke to start( with full choke it would quit.), after u let off the throttle it would rev for 3-4 seconds before idling.

i went with 75


see my pipes from the 72mains

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