I am going to help a friend jet his 450R, Does it use the same style main and pilot as the 400ex? What are the sizes of the stock main and pilot? Also is the needle adjustable? Thanks Mike

 

My dad has a 450r and the jets are the same style as my sister's 400 ex(as long as they have the stock keihin carbs). The needle is adjustable. The stock main on a 450r is a 118 (!). Not sure about the pilot. My dad couldn't take the lid off the airbox or it would turn off with that main size! With no mods, you can go to 180 with no problem. With just limited mods(no lid, k&n, spark arrestor removed), 200 main. 50 pilot is good.

 

118 main stock, thats less than the 400ex stock isnt it? that just sounds crazy, I guess with EPA emissions it may be jetted way low.

 

if its a standard keihin main jet i doubt its only a 118... my 300ex runs a 135

 

Only one way to find out!!

 

It is 118, 48 pilot stock.