350X question

[3wheelerlouie]

got the 350X fired up today and so far i like it , tons of torque and easy to control but at idle its reving a little, i turned the idle needle all the way down and she still seems like the idle is high.. i did a carb rebuild and put a new plug on it , i am scratching my noggin trying to figure out whats going on as i never encountered this issue with any of my trikes..
she also backfires alot and sputters when i hit the gas but once i am riding it it goes away but as soon as i stop and release the throttle it backfires and dies..


:(

she is fun at WOT. :drool:

[tanks350x]

check the cable at the thumb throttle, maybe it needs to be adjusted there.. As far as the back firing and stuff, That one has me stumped
:edit: make sure there is no cracks in the intake as well

[threewheelin-feelin]

it could be the timing off a bit...i had this problem on a 200s idles high and sputters and back fires...and my timeing chain was stretched and had jumped a tooth

[Russell 350X]

What color is your plug? If its backfiring like that it could be running a tad rich. Check your throttle slide, it may not be setting down on the idle screw all the way.

[The Goat]

my money is on intake leak...that oring may be rotted.

[3wheelerlouie]

The Goat was right, i found out that the 2 bolts holding the intake boot were a little loose and had a dried up O-ring .. i removed the boot , cleaned it ,put a new O-ring , and that fixed it :) ... :w00t:


hey Goat, U the man!!!!! :)

[3wheelerlouie]

UPDATE:
the air leak was fixed , but i still have some rough idle and no idle at all when i release the choke. if its not on choke its not running , and its idles high still.. i will be checking the timing later today .. i rode it a little and it feels better but still rough at idle oh and i also noticed it gets hot quick, is this normal??..

[tri-Z ripper]

welcome to riding a 350X! YES they get hot quick!! it is an air cooled motor and 350cc aint little! i run high quality oil in my machines to help aid in the high temperatures i also had some back firing but it was from riding in 25 degree weather! Check that throttle slack download a manual are you familiar with how the butterfly and throttle body raise at the same time this may also be out of sync!

[3wheelerlouie]

not familiar with the butterfly syncro.

[3wheelerlouie]

i checked the timing and its dead on, sometimes it will idle great and sometimes its just crap.. kinda frustrating and i am starting to think i have a bad or won out carb..

[3wheelerlouie]

i did notice that the butterfly throttle valve is not all the way down in the "closed" position and its about 1.8 of an inch up from its closed position , is this normal or should i tinker with it??

[Erics350x]

Normal, whats the mixture screw set at? If its set to factory specs, adjust the rockers. Will it stay running off choke if you rev it alittle?

[3wheelerlouie]

where in the world is the mixture screw?? i think its running fat because my plug is fouled , i replaced it with a new one and its still fouls up..

[tanks350x]

you had mentioned before that you backed off the idle screw all the way,,, did you put it back??? just a thought
Tank

[3wheelerlouie]

i got it where its idling ok but sometimes it will just backfire or sputter and dies.. i will tinker with the air screw today .

[Erics350x]

mixture screw is under the carb between the bowl and intake. you need to download a service manual., do a search and you find em on here for free