450r jetting

[XCRACER26]

What size jets do you think I should run? I have a full pipe,ported,wisecopiston[stockbore], 03 CRFcam, Uni filter, head milled down, closed airbox lid. thanks.

[ALLUWANT]

im am runnin a 195 main jet and i ve been told that u dont need to change the jetting for a cam. call nmotion and talk to them they have been pretty good with my bike

[emaxxjeremy]

why did you do all those mods and keep the ring around its neck with the airbox lid closed?

maybe he rides in sandy terrain...or maybe he has holes drilled

[XCRACER26]

xc, you run a bike with a open air box through a crick 2 ft deep and rutted. have fun. I have almost drowned my bike with the lid on. I might drill holes.

[Kilabanshee]

A 195 main is way to rich. I have similar mods. Your jetting should be around a 175-180.

[XCRACER26]

thanks

[ALLUWANT]

i had a 175 main in my bike and it actually slowed it down. the bike i compared it to i was beatin stock by about 3 bikes when i put the 175 in it he was beatin me it was lean poppin on top in. know with the 195 i am puttin bout 7 or 8 bikes on him

[Kilabanshee]

That's pretty strange. I got the best hp out of a 180 main jet. My A/F reading was best with a 165 main jet. I had pretty much everything you could do to the motor and I still was alittle on the rich side with a 165 main. Maybe you were getting those lean pops from your pilot being to small or your needle clip on the wrong position.

[ALLUWANT]

well i tried a everything up from a 175 and the 195 had the best trottle responce the best seat of the pants feel and when i raced the same fourwheeler with all the jets i beat him the worst with the 195. i have a 58 pilot jet so i dont think i am to lean down low. idont tune my fourwheeler by the plug either i do it a little different. im not sayin it the best way but my competition doesnt like it when they pull up next to me

[Colby@C&DRacing]

I run a 13:1 piston, HRC cam, HRC lid, Full exhaust. My jetting is 195 main 50-52 pilot and the HRC needle. I have never had a water problem with the HRC lid.

[XCRACER26]

I think I will put a 185 in it and see how it runs. what size pilot do you think I should run? and the needle at what postion. I can build a pre filter on to my lid, but for now I will leave the lid on

[Kilabanshee]

Try a 180 main first, 50 pilot, 3rd needle clip, 2 1/2 turns out on the a/f screw.

[Colby@C&DRacing]

I would start with the 50 pilot. But I don't think you will have any luck running a 180 main with lid on, the motor will just not get enough air for that much fuel. I would run the needle in the third or fourth clip. I strongly recommend you get the HRC jet kit you will gain alot in the mid range

[Johnny B]

i have a full sparks exhaust and the lid off and i run a 192 main in mine. it is the best one i have tried from stock (118) all the way up to a 195.

[Mobile Dyno]

Originally posted by XCRACER26
What size jets do you think I should run? I have a full pipe,ported,wisecopiston[stockbore], 03 CRFcam, Uni filter, head milled down, closed airbox lid. thanks.

You should run a 50 pilot, HRC Needle in the 3rd from top, 160 main and 2.5-3 turns out on the mixture screw