carb jetting question

[chrisw70]

putting son's 99 400ex back together. we bored it to 86 mm piston with stock cam and valves. we put a full lrd header and muffler on. i need to know if anyone has similiar setup and a place to begin on jetting. the exhaust was bought used and with no info.

[chrisw70]

i almost forgot. we are around louisville, ky.

try 165 main with 42 pilot. mabie a 160 or 170. prolly 160 or 165...

what is your elevation... my #'s are good for around 1,500ft and under.

[chrisw70]

sorry, i guess i should have added that. all i have to go on is louisville's elevation which is around 500'. would that be close to your #'s for 1500'?thanks , chris.

ya my #'s would be correct then. air is pretty thick so the 165 prolly

[chrisw70]

ok, i put a 165 main jet and a 45 pilot jet in today just for a place to start. i am getting fuel and spark but it won't start. seems to be flooding when trying. what about the needle after switching to larger main. should it be moved? possibly letting too much fuel in to start. i appreciate any help.

[Chino886]

Originally posted by chrisw70
ok, i put a 165 main jet and a 45 pilot jet in today just for a place to start. i am getting fuel and spark but it won't start. seems to be flooding when trying. what about the needle after switching to larger main. should it be moved? possibly letting too much fuel in to start. i appreciate any help.

Is it a new plug?

Try hooking it up to the battery charger for a boost....more comression=harder start.....

[chrisw70]

alright i finally got things going. i was leaking oil with the new valve cover gasket so i took it out. i used a gasket maker by permatex. when i did, the valves had been set the first time, making them too tight without the gasket. adjusted the valves correct and it runs great. thanks everyone for the input. goes to show, check and double check. there is always some simple solution.