lean or rich help/

G

gohst ryda

New Member

Jun 17, 2009

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australia

Jul 29, 2009

• #1

with my expansion chamber added to my 69cc i need more top end
thew plug is black, do i need more fuel getting in or do i need to add more oil????
im confused?

 

Pablo

Master Bike Builder & Forum Sponsor

Dec 28, 2007

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Duvall, WA PNW

www.sickbikeparts.com

Jul 29, 2009

• #2

How much oil are you running?

How are you checking the plug? (best is after a hot hard run)

When someone is talking about tuning lean/rich refers to your air/fuel mixture (not the oil)

Sounds like you might be slightly (fuel) rich. What notch are you running?

 

NunyaBidness

Active Member

Jun 29, 2008

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38

memphis tn

Jul 29, 2009

• #3

this post should help answer some questions for you, http://motorbicycling.com/f30/how-read-your-spark-plug-9272.html#post89518
has pics too

 

Sydneysider

New Member

Mar 20, 2009

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Sydney

Jul 29, 2009

• #4

Blocked or restricted mufflers can make plugs black just like too rich fuel mixtures. If the problem occurred just after you put the expansion chamber on, Id say it would be that..

 

F

freewheeling frank

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Mar 10, 2009

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ridgway colorado

Jul 29, 2009

• #5

sounds like your running to rich, or too high oil to fuel ratio

 

Pablo

Master Bike Builder & Forum Sponsor

Dec 28, 2007

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Duvall, WA PNW

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Jul 29, 2009

• #6

It's pretty common to be forced to re-jet when installing a tuned expansion chamber, it's what tuning is all about.