400ex hard start

[s23599e]

i live in quebec city and when temperature is below 5 C,
my 400ex '00 is very hard to start.

i put choke full close, 3 snap throttle shop ( for accelaration pump)
and start.
the engine run but if i not put little throttle, the engine stall because idle too slow.

if i speed the idle for not stall, when engine hot the idle is 3,000rpm

when engine is hot, no problem

I have just k&N filter and main jet 162 ( plug check ok)
if i change slow jet 38 for 42

this is stop my problem????

tank for all

scuse for my english, i speark french

[Glamis400ex]

Your english is just fine.

Do you have an aftermarket rev box? Take it off if you do. Upping the pilot to a 40 should help as well.

Glamis

[s23599e]

i dont have aftermarkets parts, just a k&n filter and main jet 162

just slow jet 40 is enough???


why dont put a 42

[stc416rider]

a 42 will be fine

all 400EXs are hard to start

i put mine on full choke and hit the buttonand when u get it started i slam the gas and then slam the choke upand ride it

[ak_stick]

its hard to start because its cold. The oil is cold, and the gas is cold. once you get it running, you should let it idle for a little bit to let the oil warm up. Otherwise you run the risk of damaging things.

[wheeltrax]

also what would help is to make sure your battery is in tip top shape. a weak battery would make it harder to start also. increasing the pilot (slow jet) to 42 would help alot also. Lastly, run a lighter oil or better yet a synthetic, it will be thinner and turn over better. Cold thick oil is hard to turn over on.