PROBLEM WITH MY 05 450r

[proff x]

i just finished 11.5:1 compression and kibble white valves and springs. idles good sounds good running a 165 main and stock pilot and the quad ran beutiful previously. but now the quad gets to about 3/4 throttle maybe less and falls straight on its face. is it jetting? timing? anyone else have this problem

[jr4]

sounds like jeting check your main jet may be loose

[Brauap]

Is the choke on? :chinese:

[chevys&honda$]

do you have an aftermarket airbox? or stock? lid on or off?

[proff x]

it has a kn air box lid. it seems unlikely the mainjet could be loose but ill check it anyways

[d3ktrix]

165MJ is way too lean for an 05 with the stock carb and air box lid off.
If the air box lid is on, then 165 is probably too rich.

[proff x]

what jet do u suggest

[d3ktrix]

Whats ur elevation?
Air box lid off?
Exhaust?

[proff x]

hmf slipon, airbox lid off, about 400 ft above sea level

[d3ktrix]

Try something in the 180-185 range.
Then let us know how it runs from there, see if it needs anything else.

[proff x]

aight cool thanks

[wykyd450R]

HMF suggests a 180 main with lid off w/a slip on.