Jetting for FMF Fatty exhauast?? - Yamaha ATV Forum
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post #1 of 5 Old 01-07-2004, 12:01 PM Thread Starter
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Jetting for FMF Fatty exhauast??

I just bought a set of FMF Fatty pipes with power core 2 silencers and was wondering if anybody new what jet size I would need to go to. I live in Iowa at 1219ft above sea level and want it to be jetted to ride during the summer in tmeperatures between 60-90 degrees. Do I need to change needles or adjust fuel mixture also? I am using the stock airbox and filter minus the snorkle. My motor is stock except for a white brothers boost bottle and boysen reeds.

Or is there somewhere that I can get a jetting chart from FMF?
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post #2 of 5 Old 01-07-2004, 12:40 PM
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there should be a jetting chart at FMF'swebsite- Also you can call them and their tech guys are usually pretty close- especially if the bike is mostly stocklike yours.

2004 YFZ 4five-oh
2005 CRF450F
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post #3 of 5 Old 01-07-2004, 02:46 PM
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start at 310 if you have any air intake mods filters, lid, dual pods, things like that and then do a plug chop also turn your air screw out three turns
i just read you post agian and you should drill holes in your air box but i would still start between 290 and 310 start higher and work you way down.
loose the boost bottle while your in their

89 Banshee
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post #4 of 5 Old 01-08-2004, 02:21 PM
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What is Fmf's site address?

And what do you recommend for SST's running at 60-90 temp and 1200 elevation?

~Nothing beats the oregon dunes~
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post #5 of 5 Old 01-08-2004, 06:02 PM
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I wouldn't believe what they say because I had a really good near by shop do mine and they called and said 320's. So the shop put in 340 and rode it around and it was really lean they had to end up at 380's and now it flys. But I have a k&N and cut box and they knew this when we called.
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