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anybody know about any way i can get some more power out of my 2005 crf100f without spending money or at least not a lot

First take the spark arrester out if you can. Take the screen out of air box. turn your mixture screw right 1.5 turn and try that worked better on my 150. Drill half inch holes in air box if you want to butcher it. Depending on the terrain your riding. try that and have fun

You can change the front sprocket to a 13 tooth for more torque or 15 tooth for more speed Me i am going to get a 15 tooth.

branslide wrote:First take the spark arrester out if you can. Take the screen out of air box. turn your mixture screw right 1.5 turn and try that worked better on my 150. Drill half inch holes in air box if you want to butcher it. Depending on the terrain your riding. try that and have fun

what airbox screen
i did the mixture screw and that just made it idle high or did i turn the wrong screw
where do i drill my holes

You probably turned the idle screw

Pull the seat, remove the snorkel, and drill a couple 1 inch holes in the top of the air box.

so wheres the mixture screw

The fuel screw is on the bottom of the carb towards the front. Prior to 2005 it was a straight slot screw. 2005 and up has a "D" shaped screw. Dynojet sells a special tool to adjust the "D" shaped tool (DT-008) for $3.00. Check their website and call them directly to order it.

i looked all around my carb and there was only one screw and that was the idle screw

what ever but wheres the airbox screen

It is underneath the carb. It's a straight slot or "D" shaped brass colored screw.

ok wheres the screen

i found the screw and it wont turn

If you are on right one, it will turn. If it's an older bike and hasn't been adjusted, than it might take some effort.

wheres the screen