i know this topic is beaten

[revin-it02]

i know this topic is seriously the last thing you want to hear, but... jetting...

for some reason my bike is runnin real sh*tty and its getting me to the point of almost getting rid of it, all i have for mods is a f7 pipe and a twin air filter, i popped in a 270 main and its at stock needle clip position

it runs ok, up until half throttle, then seems to have no balls

today i went for a run up my road and once i hit 4th gear (all other gears in full throttle ripped) it just started to bog after half throttle, it then started to cut out and when i stopped, didnt want to idle

i stop, let it sit for a min and it was hard to start, then once i got it started, ran great... then did the same thing... then backfired a little bit.. get back home and it idled fine

im stumped, whats happening? btw, the TORs is off of it, but idk electrical wise what was done, i bought the bike with it off

ohh and also, ive been toying with the air screw needle, turning it in riches it correct? i just had the huge problem of trying to get my idle to stay down after i rev it up, yet depending on the day, itll still hangs revs, it seems like the lower my idle is (near stall), the less it seems to hang revs... why is this?

last thing, why i cant post in the "ask a pro" section is a little wack

 

[98blaster+4]

so it sounds like you could be running lean
pull your plug and take a look at the ceramic part of the plug, tell us what color it is. OR take a picture of it.
then i can help from there
also a 270 sounds pretty lean to me for your setup. i am running a 320 main in mine with a pipe , filter and reeds. so you should be up somewheres aound 300+

 

[revin-it02]

so it sounds like you could be running lean
pull your plug and take a look at the ceramic part of the plug, tell us what color it is. OR take a picture of it.
then i can help from there
also a 270 sounds pretty lean to me for your setup. i am running a 320 main in mine with a pipe , filter and reeds. so you should be up somewheres aound 300+

my old bike ran a 320 main with the airsol kit, theres no way id be running a 300 with just a pipe, thats like bumping it up 25%+ of the original

plus i was looking at what most run for it and they all seem to use 270-280, CT racing even recommended that as well

 

[98blaster+4]

did you pull the plug and check yet?
i say 300+ as a recomendation only knowing you have an f7 pipe . i dont know your elevation or anything like that. but if its backfiring in the upper gears your probably running fairly lean. the plug will tell you what you need to do

 

[dygz21]

First off is your TORS connected? Second it seems to me that if it runs great in those gears and then all the sudden cuts off you might be running out of gas in the bowl...

 

[blasterdude14]

more than likely you are jetted lean, up the main jet a little bet it works a lot better.
just because your old bike with the airsal kit jetted with a 320 main doesnt mean anything

Bump up the main jet

 

[2strokesmoke]

bump up the main and/or lift the needle a clip. have you tiead a new spark plug, cleaned the carb, checked the reeds etc just incase?

 

[phragle]

well if it ran fine at one throttle position and bad in a different throttle position, that is jetting. if its over half throttle, that is somewhere between either the needle and the main. It always safer to go richer than leaner, so go up 2 sizes on the main and see what it does.

 

[little3mil]

i didnt even read it all do a leakdown test you more than likely have an airleak on the intake side by the reed cage gaskets

 

[2strokesmoke]

well if it ran fine at one throttle position and bad in a different throttle position, that is jetting. if its over half throttle, that is somewhere between either the needle and the main. It always safer to go richer than leaner, so go up 2 sizes on the main and see what it does.

so crap in the carb physically cant give you running issues? a cracked plug or other electrical faults cant break down when you rev the bike up? my point is you can check these thing first before buying jets because these faults can and will cause problems like this, look what i went through phragle.
its more like your jetting, but then thats what everyone [including me] thought was wrong with mine, turned out it was the source coil.
so if i went and bought jets they would have been no use. check the basics first thats all im saying.

 

[revin-it02]

could it possibly be runnin lean on the clip then running rich on the main causing it to flood? reason y i ask, is cuz i just did another ride and noticed gas came out of the clutch side carb vent after my attempt at full throttle

 

[Awk08]

with my f7 pipe and uni filter in a cfm airbos, i was running a 320 main in my stock carb, it pulled really hard with the 290, but plug read lean
you better get some 300+ mains and give them a try or your gonna fry it

 

[mystahagy]

could it possibly be runnin lean on the clip then running rich on the main causing it to flood? reason y i ask, is cuz i just did another ride and noticed gas came out of the clutch side carb vent after my attempt at full throttle

If it's overflowing out of the carb then that's a leaky needle/seat or stuck/sunk float.

Let's be more specific. "No balls"..... does it just plain fall flat, or does it spit, sputter and sound snotty. Those mean different things and determine what direction to go in.

If you haven't, clean this flippin' carb before you even think about trying to tune it. Unless you like wasting your time of course...

 

[revin-it02]

If it's overflowing out of the carb then that's a leaky needle/seat or stuck/sunk float.

Let's be more specific. "No balls"..... does it just plain fall flat, or does it spit, sputter and sound snotty. Those mean different things and determine what direction to go in.

If you haven't, clean this flippin' carb before you even think about trying to tune it. Unless you like wasting your time of course...

the carb is spotless, this was the first thing i did (it wasnt that dirty to begin with however). also, it spits, sputters and just plain sounds snotty

 

[mystahagy]

Snotty is rich, but it sounds like you still have a carb maintenance issue with the fuel coming out the overflow.

If you only gave the carb a good spraying with cleaner, I'd suggest you tear it down to individual pieces and clean it in a white bowl. Might have junk in that needle/seat. Pull out all jets, float, needle/seat, etc. I know I sound like a carb cleaning nazi but I won't even attempt tuning unless I know the carb internals are mint, and that overflow issue sounds funny.

 

[revin-it02]

basically it just doesnt want to rev out, hesitates, then it will after awhile, then itll spit sputter and sound nasty

 

[98blaster+4]

have you checked your plug?!?!?!?! seriously the plug will tell you what direction to go in. it all comes down to the plug reading. should be the first thing you check.

 

[revin-it02]

heres the plug, im slightly color blind, but it looks like a light brown color like it should be no?

my GF said the same

 

[phragle]

you do not read the tip, you read way up inside on the insulator. raise the needle one clip and go up 2 sizes on the main jet, go ride it and see if it made a difference.

Just pulling the plug and looking at it is worthless too.... as you undoubtedly rode either to the trailer or home and putted around at less than 3/4~full throttle.

raise the needle one clip and go up 2 sizes on the main jet, go ride it and tell us if it made a difference.

raise the needle one clip and go up 2 sizes on the main jet, go ride it and tell us if it made a difference.

Repeat after me...

raise the needle one clip and go up 2 sizes on the main jet, go ride it and tell us if it made a difference.

 

[revin-it02]

well i completely gutted TORs and then moved the needle to the middle and left the 270 main in

not as bad, but now bogs in 6th, popped in a new plug and its a little darker then the pic above