300EX dount run good

[big bad beny]

towerd the end of middle and top end the motor cutts out.

eny help would be great
thanks

[jay's 300]

Have you rejetted your carb and if so what size main jet are you running?

[Cody_300ex]

Sounds like your a lil rich. You might wanna do a plug check.

[big bad beny]

Its not my jeting done put every jet i got in it no change.
I put my jeting back to were it was to begin with.



118 main jet

its got a dynojet kit in it
its been in there for almost a year

[hardkoratvmxr]

118 seems way to low i run a 125 with just the hmf slip on and k&n and closed airbox

[gratzracing24]

check your ignition coil mine was doin the same thing i re jetted it and it worked fine for about a week and started to do it again put a new coil on it and its been working fine

[ethanp87]

118 is way to lean they are 122 stock what have you got done to it pipe ext...or have you had it apart lately.

[big bad beny]

mine came with a 120 main jet stock.

Port and polish 40 over 11:1 comp HMF slip and white bros header

[ethanp87]

i would go to a 130 or 132.

[hardkoratvmxr]

i would get these jets 130 132 135 and 138

[hondardr4life]

Dang, that is really lean to run with that setup!!! Richin it up to around a 130 or so.