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300sef - Full throttle problem

323 Views 3 Replies 3 Participants Last post by  deepimpactenduro
Hi Guys, I hope that someone here could help me :)
On Low RPM everything works fine but if I go full throttle it loses the power. Does anyone have any idea what could be the problem?
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If the RPM stays high and theres no power at WOT, you probably are running too lean and need to put in a larger main jet.

If the RPM drops and your bike sounds like its bogging out, your main jet is too large and you need to put in a smaller one.

Could be a mechanical issue or something else though. Check your jetting against the user manual, to see if you are in the right ballpark. Ive had good luck with JD jet kits also.
If the RPM stays high and theres no power at WOT, you probably are running too lean and need to put in a larger main jet.

If the RPM drops and your bike sounds like its bogging out, your main jet is too large and you need to put in a smaller one.

Could be a mechanical issue or something else though. Check your jetting against the user manual, to see if you are in the right ballpark. Ive had good luck with JD jet kits also.

SEF is a 4T, ie has an injector, so perhaps there might be an ECU map update?
SEF is a 4T, ie has an injector, so perhaps there might be an ECU map update?
Yes my mistake. I cant speak for anything ECU related.
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