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[QUOTE="cr250john, post: 142893, member: 18838"] [b]CR250 plug chop picture[/b] For setting the main jet, a plug chop test seems to work well. Install a new plug, ride it around for a while to give it some color. Find a long uphill (sand if possible to provide engine load) section, get into 4th or 5th gear wide open for say 10-15 seconds. Simultaneously pull the clutch, hit the engine kill button, and close the throttle. Coast to a stop. Pull the plug and look [b]WAY DOWN[/b] the plug where the porcelain meets the metal shell. You will see a mixture ring as noted in this link [url]http://www.strappe.com/plugs.html[/url] Here is what my '00 CR250 plug looked like. The plug was cut down on a lathe. [IMG]http://users.snip.net/~wilks/cr250a.jpg[/IMG] Word from DRN moderators is that it looks pretty close to correct main jetting. Remember that this test is [b]ONLY[/b] for the main jet circuit. Here is another from my kids '01 CR80. [IMG]http://users.snip.net/~wilks/cr80a.jpg[/IMG] I thought this looked a tad lean so I went one larger on the main. Is this of any help? Good luck! [/QUOTE]
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MX, SX & Off-Road Discussions
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Spark plug pictures
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