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  #1  
Old 08-14-2000, 10:24 PM
Weekend Warrior
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what should i jet the main jet at? stock = 148
what should i jet the pilot to? stock = 38
should i move the needle up or down one? or just leave it?
im around 1000-2000 above sea level....also
im from michigan...
i need this info asap please.
thanks , Billi0
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  #2  
Old 08-14-2000, 10:38 PM
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OK, first cardinal rule in jetting or any other type of adjustment: changeonly one thing at a time. Then test and change another if needed.I would start with two sizes fatter on the main..I'm not sure what the graduations are on Keihins, on Mikunis that would be a 152. Leave the jet needle in the 3rd position. Do a test ride at 3/4 to full throttle in any gear you choose for a mile, stop there & pull the plug & read it for lean or rich or correct mix.Dark or black electrode & insulator=rich. Gray or white=lean. Tan or brown=correct mix. Then you can try testing at other throttle openings to check pilot & needle jet. Normally they will be correct at nominal settings at your elev.
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  #3  
Old 08-14-2000, 10:55 PM
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im looking for the exact jetting specs from someone that has jetted there 400ex already and it is running good...only thing that i need to know is if they are at the same height ahove sea level as i am, thanks anyways...
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  #4  
Old 08-14-2000, 11:23 PM
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Lethal51
I have a complete Biggun on my 400ex. The jetting is going to depend on whether or not you are running the airbox lid or not. If you are you need to run a 152main. If not try running a 160main. I haven't adjusted my pilot jet or needle settings.
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  #5  
Old 08-15-2000, 12:58 AM
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Lethal51, I also have the complete BG system on my 400. First time I jetted it was with a 158 main and a 40 pilot power was good but it lack acceleration and it was running really hot. So, I rejetted it with a 165 main and a 42 pilot. This made my bike feel so much better on top and in the midrange. I live basically at sea level but I feel like a 165 or 160 main and a 42 pilot would do fine for you. Also, my airbox lid is off with a Uni filter and make sure to seal the pipe and silencer junction up with high-temp sealant.
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  #6  
Old 08-15-2000, 01:14 AM
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Hey he's right. Every 400 is diff. you just can't base it on someone elses settings. You've got to spend about 3 hours and do it right. Atv conection has a good story on proper jetting. Look into it. Also, a K&N jet kit would do ya right. For 45 bucks you'll get all the hardware and some decent instructions. If all else fails take it to a dealer. THey know what they're doing and it'll be money well spent.
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  #7  
Old 08-15-2000, 02:12 AM
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i herd 152 main and 42 pilot and raise the needle 1 notch ... for a biggun with no airbox lid or snorkle...does that sound right..
i think a 160 is WAY to big
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  #8  
Old 08-15-2000, 02:44 AM
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im gettin my exhaust tomarrow, woot! bt i still need jettin specs.
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  #9  
Old 08-15-2000, 11:02 AM
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I'm running the exact setting callen74 described and they work great. I use these settings from sea-level to 3000 ft. When I ride at 5000-9000 ft
I run a 155 main, but I don't change the pilot and
needle, too much hassle and it works fine. I don't think there is a significant performance difference between the K&N and UNI. If you ride in dust, I'd stick with the UNI. For sand, use the K&N with outerwear.
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  #10  
Old 08-15-2000, 09:34 PM
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Lethal51, I don't think a 160 or 165 would be too big. When I first jetted my quad I had a 158 main in it and when I jumped to a 160 and then a 165 (plus 42 pilot) it made a big difference. Also, I forget to mention that I did raise my needle one notch(drop clip to the next to last notch). My quad actually felt slower than stock with the 158, 40, and raised needle. But now like I said it is much better throughout the power range. Call Big Gun and talk to Paul he should be able help you out, too.
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Old 08-15-2000, 09:34 PM
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Tags
400, 400ex, big, biggun, call, exhaust, full, gun, jeeting, jet, jetting, quad, recommended, system, trx400ex



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