Jetting

[Punk'd]

For those of you that have seen my other post iv decided on a HMF full system ill be getting it tonight from my parts store and I have no idea how to rejet will it come with instructions and peices I will need? or is there something else I have to do. Thanks

[450r's r sexy]

i dont really know wha to rejet it because im gettin the same pipe but if ur goin to run a open air box u should run it 125 - 130 main jet and might need to mess around with the fuel screw.

[450 Racer R]

throw in a 185 main with the lid off or cut open. Where are you getting 125 from? stock is 118 I think. you could do a 130 with an open air box... you'll be playing with your fuel screw alllllll day long.

[450r's r sexy]

some guy from this site told me to put in a 125 - 130 jet if ur opening the lid...

Do u now wha i should jet when i put a hmf slip on and proflow kit open lid ??

[450 Racer R]

185. start there

[R_rocket]

With just a pipe put in a 175 main jet. If u put on the pro flow kit work your way up to a 185 main jet. If u have to go over 185 I would suggest moving the needle to the 4th clip.:cool:

[Jersey450R]

i was going to say around 170-180, depending on if you have the pro flow kit. that kit dosent make a huge noticable difference in hp, rather its more for keeping the filter connected to the airbox.