440 kits?

[CR500r Rider]

Can anyone recommend jetting for a 440 with Hotcam, WB exhaust system and stock carburator?What about airbox mods?

Does the 41mm FCR really make a difference and what would the best way to set up the jetting and airbox for that one.

I'm trying to set this 440 up for a friend.
Any info is appreciated.

[cals400ex]

what temp your ride in?? whats your altitude?? are you asking about airbox mods or did you mod your airbox?? the fcr will make a nice difference. i don't know much about the 41mm, but many people love their 39mm's.

[CR500r Rider]

The elevation is about 700ft and temps about 60-90 degrees.
I haven't modified the airbox yet.I need some suggestions on how to achieve the best performance out of the 440.I would like to retain the airbox because the machine see's water,but if I need to chop it up abit,I will.

[cals400ex]

you could leave the lid on and see how it runs. or, you could put a few holes in it or you can get an outerwear or K&N airbox lid. the jetting will change between 60 and 90 degrees. in the cold months, you could try a 158. in the warmer months, try a 155. jetting is mainly trial and error. removing the lid or modifying the lid may change the jetting depending on the temp. these should get you in the ball park though.