FMF Gnarly jetting Q's

[nomad]

My Sheera is running poorly down-low (idle-1/4 throttle) after receiving the quad with Gnarly pipes, Q series silencers, K&N filter and a dyno jet kit. The air lid is on and I'm just above sea level (300-500ft). Shee runs smokey and has a lot of soot on the end caps of the silencers (32:1 mix ratio). One plug is dark and the other is black (no plug chop performed). The main is at 280 and seems to pull strongly at 1/2 to fullish throttle (haven't reved it out yet). The air screws seem to do nothing at all. The longer I ride the worse it gets until it stalls while giving it gas at idle speed, and won't restart without the choke(?). After reading the pinned threads on carbs/jetting it seems to have too biga pilot jet (not sure what size shee has now) or to low of a clip position (don't know the positioning). I'm wondering what size jets people are running with this setup at my elevation. After I recover from surgery it's going back to the shop and I'd like to give them an educated starting point. Don't bother with the "fix it yourself" stuff as I only received it 2+ weeks ago ('06) and I don't know how. The shop is going to let me watch, and provide me with a shop manual so I can hopefully do my own work in the future. Thanks in advance for the help!

Edited August 20, 2006 by nomad

[The Faster Cracker]

My Sheera is running poorly down-low (idle-1/4 throttle) after receiving the quad with Gnarly pipes, Q series silencers, K&N filter and a dyno jet kit. The air lid is on and I'm just above sea level (300-500ft). Shee runs smokey and has a lot of soot on the end caps of the silencers (32:1 mix ratio). One plug is dark and the other is black (no plug chop performed). The main is at 280 and seems to pull strongly at 1/2 to fullish throttle (haven't reved it out yet). The air screws seem to do nothing at all. The longer I ride the worse it gets until it stalls while giving it gas at idle speed, and won't restart without the choke(?). After reading the pinned threads on carbs/jetting it seems to have too biga pilot jet (not sure what size shee has now) or to low of a clip position (don't know the positioning). I'm wondering what size jets people are running with this setup at my elevation. After I recover from surgery it's going back to the shop and I'd like to give them an educated starting point. Don't bother with the "fix it yourself" stuff as I only received it 2+ weeks ago ('06) and I don't know how. The shop is going to let me watch, and provide me with a shop manual so I can hopefully do my own work in the future. Thanks in advance for the help!

 

 

man i am in the same boat! i have pulled the carbs about 10 diffrent times trying to get something right. i get one side right but the other end is pure crap. i am running the same setup you said but i have the lid off. as soon as i get it done this weekend i will let you know. ill post again on here tuesday when i am back

[nomad]

Thanks Cracker...I'd appreciate it!

[The Faster Cracker]

hey man i did not get a chance to screw with it over the weekend. jsut some fyi for you though. dont get a damn dynojet kit. it is pure crap. the dont give you the right jets for our setup. what i am gonna do is get some mikuni jets and use the stock needle. get some 300s 310s and 320s. that should put us in the right ball park. is you have a dynojet kit already remember that dynojet jets flow diffrent than mikuni jets. im gonna try a stab at it tonight. here is a list of what i have tried already that did not work:

 

stock carb settings and airbox wiht jsut pipes runs perfect( if i remember right)

 

280 dynojetmains with dyno needle and clip on 4th groove, kand n with prefilter and no airbox lid (it was running lean through the gears)

 

went to 340s and it would backfire like no tommorow so then i dropped the needle to grooves and it would run good on choke telling me that it was lean. my headers are now crap from being burnt. there went 500 dollars of exhaust lol.

 

just for shits and giggles i put the stock filter and lid back in and stayed with the 340s and now i can tell it is deinately too too too rich! but hey at least its not screwing up my headers.

 

ill let youknow what happens when im through i with my next jet change.

[nomad]

hey man i did not get a chance to screw with it over the weekend. jsut some fyi for you though. dont get a damn dynojet kit. it is pure crap. the dont give you the right jets for our setup. what i am gonna do is get some mikuni jets and use the stock needle. get some 300s 310s and 320s. that should put us in the right ball park. is you have a dynojet kit already remember that dynojet jets flow diffrent than mikuni jets. im gonna try a stab at it tonight. here is a list of what i have tried already that did not work:

 

stock carb settings and airbox wiht jsut pipes runs perfect( if i remember right)

 

280 dynojetmains with dyno needle and clip on 4th groove, kand n with prefilter and no airbox lid (it was running lean through the gears)

 

went to 340s and it would backfire like no tommorow so then i dropped the needle to grooves and it would run good on choke telling me that it was lean. my headers are now crap from being burnt. there went 500 dollars of exhaust lol.

 

just for shits and giggles i put the stock filter and lid back in and stayed with the 340s and now i can tell it is deinately too too too rich! but hey at least its not screwing up my headers.

 

ill let youknow what happens when im through i with my next jet change.

 

Thanks for the update and sorry to hear about your pipes! Yes, it does have the dyno jet kit. I'll look into the mikuni's. I wish I knew more about 2 strokes (I'm a car and ex-streetbike guy), so this may not make any sense...but what about running the prior setup with the 280 main on the forth clip with the air box lid on? Would that richen the mixture up some? I appreciate you sharing your experiences!!!

[bones]

Hey Guys - FYI -

 

I found a great place that has Mikuni jets for our rides, check out www.jetsrus.com. And yes, the pilots they carry are also the correct version for the Banshee.

[cbn70]

I have a k&n filter with boysen reeds, and the gnarly pipes, also the air box lid is on. My jetting is as follows.

 

Main jet is 260

pilot is a 35

Dyno jet needle in second from the top

Slide has been cut from a 2 to about a 3 or 3.5

 

With this set up it seems to pull hard right from the bottom to the top, but not a lot of over rev, but that is the pipes. It seems to be a good set up for the woods and trail riding that i do. Needed to cut the slides because i could not get a leaner set from the dealer.

[nomad]

I have a k&n filter with boysen reeds, and the gnarly pipes, also the air box lid is on. My jetting is as follows.

 

Main jet is 260

pilot is a 35

Dyno jet needle in second from the top

Slide has been cut from a 2 to about a 3 or 3.5

 

With this set up it seems to pull hard right from the bottom to the top, but not a lot of over rev, but that is the pipes. It seems to be a good set up for the woods and trail riding that i do. Needed to cut the slides because i could not get a leaner set from the dealer.

 

Thanks cbn! I ride the same type of terrain you mentioned. It's not going in for two more weeks and I'm tempted to pull them apart myself, per the manual provided, while I'm sitting here recovering. I'm just afraid of the "mechanics by Al Bundy" syndrome I have...ya know, putting her back together and having "extra" parts left-over. If they weren't going to show me the process I would take it apart to inspect and bring the dealership the parts. Plus they are doing it free of charge. Thanks again for the input!

[The Faster Cracker]

what do u mean the slide has been cut for a 2 to a 3 or 3.5?

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im currently jetting a bike with a mild trail port fmf gnarlys and open airbox with k&n

 

so far im at a 310 and shes a lil rich . ( where i like to start / rich )

 

currently on middle clip stock needle

 

1 turn out on air screw / stock

[platinumjason]

I got the mods listed in my sig and I have stock carbs, 320 main, 27.5 pilot and needle on 4th clip. I am at about 700-800ft elevation. Maybe that will give you a little insight to getting yours closer on jetting.

[cbn70]

What I did was file off some material from the front(air filter) side of the slide. This will make the slide leaner and helped with leaning out the bottom end of the carbs. The stock is a 2 and I took off about 1 mm. this would make it about a 3. hope that helps.

 

Chuck

[The Faster Cracker]

ok i think i understand what you are talking about but not sure that i will do that just yet.

[The Faster Cracker]

:baseball_bat: ok i got her going jsut right. well a little rich but almost perfect.

 

300 mikuni mains

stock pilots

1 turn out on air screw

stock needle on #3 groove

 

GOOD LUCK MAN

[nomad]

:baseball_bat: ok i got her going jsut right. well a little rich but almost perfect.

 

300 mikuni mains

stock pilots

1 turn out on air screw

stock needle on #3 groove

 

GOOD LUCK MAN

 

Thanks for the update. I appreciate your help and every1 else who is sharing the knowledge!!! I can't wait to get her running right. Like a big girl at a water park...Shee is tons-o-fun!