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After testing/ riding

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Hi eddie..

2004 crf 450r

elevation 1000ft average

trail riding only (tight single track)

165 main jet - needle NYCR 4TH

no toil pre oiled air filters -

quickshot 2 accel pump

otherwise, the bike is stock.

I put a new plug in, and rode trail for a few hours.. pulled it, and found what you see below. a 162 main is recommended up to 999ft, and a 162 beyond that. average elevation for the area is 1000ft. so is my next step moving to a 162 main? or moving the needle?

this is what I found: I suppose this is what you would call carbon fouled from running rich.

IMG_0166.jpg?t=1270397255

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165 is correct for sea level up to 2000. the needle is plenty lean at the standard clip position. A 162 is fine at 1,000 feet on an 80 degree day.

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165 is correct for sea level up to 2000. the needle is plenty lean at the standard clip position. A 162 is fine at 1,000 feet on an 80 degree day.

repair manual calls for a 162 above 1000ft..

crf-chart.jpg

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jakobreid seems to be on the right track. I haven't looked it up but, I would defiantly say that's rich. However, from what I've read on th Internet and looking at the porcelain is seems a little rich everywhere.

Take a few minutes and look at some of these links. There is a lot of info on how to read plugs. Of course, this should only be used as a guide to "help" confirm your suspicions of jetting issues. An aid to help you keep moving in the right direction. If you put to much stock/belief in reading these plugs they will sometimes lie to you. At least, I have found that the have lied to me. Just FYI. Almost nothing will beat the "seat and paint" feeler gage!!

http://performanceunlimited.com/illustrations/sparkplugs.html

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp

This one has all kinds of cool stuff on it!! look it over. The spark plug portion is toward the bottom and in the middle.

http://www.4strokes.com/tech/

Edited by motodogg01

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