Throttle response

[Tigman]

Jetted my 300ex the other day and ran it it ran fine. I put a 118 dynojet in it. I have a fmf powercore4 and a k&n coming. First question, will I need to bump my jet up some to compensate for the air filter? And second, if I am at idle and I crack the throttle open there's a hesitation but if I have it open about an 1/8 throttle and crack it open its very responsive, any reason why?

[hondafreestyler]

jettings prob a lil off ...
stock carb ...

[quadmxracer]

Since there's hesitation from idle if you jab the throttle all the way sounds to me like you may be a little lean just off of your pilot jet.

[phebus]

Try going a 1/2 turn out on your fuel screw and see if it helps.

[2004TRX450R]

As I recall the 300EX doesn't have an accelerator pump so it will have a slight hesitation if you go from idle and just wack the throttle wide open. You can help it out some by turning the fuel screw out a little. The proper way to set the pilot screw is to get it completely up to operateing temp and adjust it in and out until you reach the highest idle.

[ATVer14]

Nope, the 300EX does have an accelerator pump.

[Tigman]

I'll try the mixture screw next time I go out, I think i'll need to fab a small *** screwdriver though. The 118 dynojet was what was recomended by them but my plug was white so I bumped it up to a 124 and checked it with a brand new plug. After riding for about an hour and now its a little grayer, should I go even higher or do you think it might be the additives in the fuel? Thanks for your help guys