YFZRida05 Posted January 16, 2009 Report Posted January 16, 2009 (edited) Hey what's up... I have a set of old school FMF gold series pipes, and a pair of 270 main jets for the stock carbs... Intake is stock with lid and snorkle... Temperatures range from today at 10 degrees to about 40 degrees... All stock just the pipes... 800 ft. above sea level... Think I could just slap the 270s in and ride it? Or is it too cold to run 270s with just pipes? Also, I have been running amsoil dominator full synthetic 2 stroke mix oil, and on the back it says to run it 50:1... so that's what i've been doing, however i've been reading on here that most people still run 40:1 with good oil... should I be okay at the 50:1 that Amsoil suggests, or should I start mixing some 40:1? Thanks a lot, and any help would be appreciated! Edited January 16, 2009 by YFZRida05 Quote
blaster2006 Posted January 16, 2009 Report Posted January 16, 2009 Hey what's up... I have a set of old school FMF gold series pipes, and a pair of 270 main jets for the stock carbs... Intake is stock with lid and snorkle... Temperatures range from today at 10 degrees to about 40 degrees... All stock just the pipes... 800 ft. above sea level... Think I could just slap the 270s in and ride it? Or is it too cold to run 270s with just pipes? Also, I have been running amsoil dominator full synthetic 2 stroke mix oil, and on the back it says to run it 50:1... so that's what i've been doing, however i've been reading on here that most people still run 40:1 with good oil... should I be okay at the 50:1 that Amsoil suggests, or should I start mixing some 40:1? Thanks a lot, and any help would be appreciated! lol, 270 is 7 sizes up, just for an fmf, i think its maybe abit too rich, but go ahead. i was thinking when i get pipes and a 2in1 k&N ( with lid, no snorkle) i would run 260's. just pipes need 3 or 4 sizes higer from what is running as perfect jetting, if you are thinking 270s are lean i say no way, for the oil id stick on what it reccomends Quote
YFZRida05 Posted January 16, 2009 Author Report Posted January 16, 2009 (edited) Yeah I'm just asking because it is FREEZING here and usually for winter you need a couple sizes bigger on the mains due to the dense air... So I guess I'll give the 270s a shot... and if it is a tad rich, i'll pop off the snorkle or try something else I guess. Anybody else have any input... 10-40 degrees F and 800 ft above sea level in Northern NJ... FMF gold series pipes only. Edited January 16, 2009 by YFZRida05 Quote
sheefreak Posted January 16, 2009 Report Posted January 16, 2009 I would have to disagree. I would agree if it was summer time, but since you have no idea where you should be I would start w/the 270's and work down. You may be rich, but you might find that the bike runs really well w/270's on those 10 degree days... Quote
Banshee_Bandit Posted January 16, 2009 Report Posted January 16, 2009 I have 285 Mains, PJ stock & needle at stock position. Running with K&N Intakes and snorkle off. Running perfect mate & better run rich than lean. Stay on the safe side and start richer and check your plugs. Then you still can lower down the Jetting... Kind regards & Good luck Quote
YFZRida05 Posted January 16, 2009 Author Report Posted January 16, 2009 Thanks guys, I'll give it a shot! This is my 3rd banshee and I just need a ballpark because I was out of the loop for a while haha. Would taking the snorkle off make any difference with airflow and jetting you think? Say i'm a tad rich with the snorkle on, if I take the snorkle off, would that lean it out a tad? Quote
sheefreak Posted January 16, 2009 Report Posted January 16, 2009 Yes, but just a tad. Taking the lid off will obviously make a bigger diff yet. If you are not running through massive puddles and mudholes, you will be fine w/lid off. Good luck! Quote
AKheathen Posted January 17, 2009 Report Posted January 17, 2009 i have the same pipes, no snorkel, but lid back on for below zero, and i rode it at -10, and +20, and 310's were perfect! 27.5 mains were needed too. i also bumped my oil ratio up too, cus it was too much oil with all that fuel. Quote
fastbanshee8 Posted January 17, 2009 Report Posted January 17, 2009 The FMF pipes need a fatter pilot, so I have to agree with the previous post, and say to bump the pilot up to 27.5, and your 270 may be lean, with those temps. Like someone previously stated, start fat with the main, and work down. I'd start with a 290, or 300, and see what it runs like. You're better off being a little rich, than a little lean. Too lean, and you will have to rebuild the top end, unless you like pistons with holes in them. Quote
SandRageShee Posted January 17, 2009 Report Posted January 17, 2009 im at 2200 foot elevation. and i run an open airbox with a two stage proline intake and filter. and im runnin stock carbs with 300's! and im lean just a tid.. ima bump up to about 310's or 320's. and its ranging from like 55-70 degrees here. Quote
Banshee_Bandit Posted January 19, 2009 Report Posted January 19, 2009 Pilots stock and I didn`t change them at all until now. In terms of pushing them up to 27.5, would it make any difference to my engine since the plugs seem to be just perfect with my 285 mains ? as far as I know the PJ is taking effect in 2/4 of the throttle response, and has nothing to do with the mixture (rich/lean). Please someone correct me if I`m wrong there. Cheers, Ed Quote
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