350X question

**3wheelerlouie** · 03-20-2009, 11:12 PM

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.

**tanks350x** · 03-20-2009, 11:26 PM

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** · 03-21-2009, 01:06 AM

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** · 03-21-2009, 01:17 AM

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** · 03-21-2009, 01:18 AM

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

**3wheelerlouie** · 03-21-2009, 08:52 AM

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

...

hey Goat, U the man!!!!!

**3wheelerlouie** · 03-21-2009, 10:19 AM

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** · 03-21-2009, 10:31 AM

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** · 03-21-2009, 02:34 PM

not familiar with the butterfly syncro.

**3wheelerlouie** · 03-21-2009, 06:45 PM

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** · 03-21-2009, 07:09 PM

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** · 03-21-2009, 08:49 PM

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** · 03-21-2009, 10:50 PM

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** · 03-21-2009, 10:57 PM

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

**3wheelerlouie** · 03-22-2009, 08:58 AM

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 .

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350X question