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jetting


DaweOne

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ok im new to this i live in canada Gatineau qc to be exact not to shure of elevation but right now its about -5 to - 15 c i have pro designe filter no lid aggressive ports stock bore toomey t-5 pipes tors eliminator and currently runing 290 main jets and 30 pilots what do you all think ??? thx

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cool thx but before tha pipes and what not i was runing 250 mains and 25 pilots and it was perfect now i jetted at 290 and 30 pilots !today is like -3 out and when i start it up one kik whit full choke flip it right of runs perfect when i pull back on choke it wants to die every thing in carbs is new and all cleand perfectly

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That could be due to pilot jets. 25 is stock, most use 27.5 with most pipes. Running nice in shed has nothing to do withWOT with a load on it. My son's is unported 4mil, head spacer, FMF Golds, no lid 310s@70*f, that would make it min 330 if I ran today. Mikuni pocket calculator: one size larger for every 20*f drop in temp. Do what you feel best, plugs are still cheaper than pistons, it's possible to melt a piston before you go far enough to do a plug chop or even check it.

 

JMHO, your results may, and will vary. :jesterlaugh::cheers:

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use to be pilot 25 on bone stock whit aggresive ports since the pipes and the pro designe filter whit no lid ive swap 30 pilots in whit the 290 mains keeping in mind its - 5 to - 15 down here and for the shed part i ment it does not sleep in the heat and still starts perfect whit no choke beffor the pipes and the filter i needed a choke full on to start and still had a hard time but on the plug chop it was perfect so im loocking to going for a ride tomorrow and do a plug chop juste wondering why now it starts like a beauty whit no choke thx

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Start with 340-350 or so, you are running in seriously cold weather. I think anything in the 200s could be lean in those temps if you are in lower elevation. Start in the mid 300s and junk down a few if the ring is black but start rich.

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tried it today was slugish in low end and wen the powerband kik in it felt like the handle bars where gonna rip did a plug chop turn to be lean so swap in 300 mains and put back the stock nedles the toomey needles turn to be to lean at its riches setting it was like the leannes on stock so realy help to put back stocks whit 300s and 30 pilot it fixt the slugish part just dint get a chance to got WOT on it plan on doing that tomorro! let ya know whats up and for wheather is not that bad down here -5 - 10c all week and like that for next week to !

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