Plug Picture...Lean or Rich?

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WaterDog

WaterDog

New Member
Sep 12, 2010
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Miami / Fort Lauderdale, Florida
Put in a brand new Champion plug gapped at .30. Took it out for 15 minutes, half at medium speed and half at open throttle. I am still breaking in the bike and have maybe 75 miles on it. I am using synthetic oil at 25:1. Does the plug look bad after just 15 minutes, or should I just chill until the break in period is over. Runs and idles great, but does seem to choke out at little over 90% of throttle. Thanks guys!!
 

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muddybike

New Member
Jul 31, 2010
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Calgary
Im new but to me that looks lean , i was under the assumption that a light chocolate tan was the color that your shooting for ...

Dont take my word tho , wait for others to chime in!
 
Mind_Reader7

Mind_Reader7

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May 1, 2010
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Northam, Western Australia.
Slowrollers said:
Do a proper plug chop
Plug chop - MopedWiki
Click to expand...
“Plug Chop Plug Chop Plug Chop” I cry!
“Until you learn to feel me,
You’ll have to do it by eye.”

When it's dirty and black, it's got the ****s,
You have too much gas you are running rich.

When its hot and white, but looks pretty clean,
You're 'bout to blow your **** up; you're running lean.
Click to expand...
Nice way of remembering it according to that site.
 
S

Slowrollers

New Member
Sep 8, 2010
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downers grove Il
Check for airleaks with carb cleaner....Spray it around the intake and carb first.if the motor revs high or dies BINGO! If not start checking the base gasket & head gasket.... If Not there then go spraying on the case halfs......
 
Kevlarr

Kevlarr

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Jul 22, 2009
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Mi
Something I've found that's a little more paint friendly then carb cleaner to check for air leaks is glass cleaner (spray bottle on the stream setting), it works just as well and instead of eating the paint on your engine you clean it. :D
 
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Slowrollers

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Sep 8, 2010
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downers grove Il
Kevlarr said:
Something I've found that's a little more paint friendly then carb cleaner to check for air leaks is glass cleaner (spray bottle on the stream setting), it works just as well and instead of eating the paint on your engine you clean it. :D
Click to expand...

Ive also used keyboard duster(Dustoff) it works but not as well as carb cleaner......I have two black painted motors and carb cleaner has never harmed them.....
 
bairdco

bairdco

a guy who makes cool bikes
Aug 18, 2009
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i agree with Jim above. 15 minutes on a new plug isn't enough time to get an accurate reading. try riding it for a few hours at least, vary the throttle, and do a "plug chop" as suggested so you don't just dump raw fuel on it when you shut it off.
 
corgi1

corgi1

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Aug 13, 2009
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If you pull the plug w/ the motor hot will the threads come out ?.
and on the lighter side,if you check the plug this way every 5 miles wont that be cost prohibitive?




lol
 
Goldy

Goldy

Member
Oct 3, 2010
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Nova Scotia
For only 15 minutes running it looks fine, but I completely agree with Jim and Bairdco that this isn't long enough of a run to get a good reading.
 
Dave31

Dave31

Active Member
Mar 1, 2008
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Aztlán, Arizona
Okay about 12 minutes to do 2 runs and change the jet...

1st photo is the first run about 700-800'

2nd photo 2nd run Changed to a bigger jet to richen it, and again about 700-800'

Of course I did not add the time to warm the motor up.

You can clearly see what a difference the jet made in such a short run, so I dont know?
 

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Goldy

Goldy

Member
Oct 3, 2010
196
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Nova Scotia
First plug looks perfect, how about you just leave it running with that jet for a while and see what happens?...these little engines are working their guts out (like a chain saw engine), so you might not have to wait as long to get a decent reading. Second plug is definitely running rich if it got sooty that soon.
 
bairdco

bairdco

a guy who makes cool bikes
Aug 18, 2009
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living the dream in southern california
you may be right, Dave. i was thinking with a newer engine and a rich oil mixture, it'd take a little longer than 15 minutes before it got all gunked up and turned black.

on a tuned engine, a coupla blasts up and down the street would probably be enough to see what's up.
 
Goat Herder

Goat Herder

Gutter Rider
Apr 28, 2008
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SBP had said about the same thing in there pipe instructions as Dave did. That's about the way I always did it.
 
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