2007-01-20 14:14:37 · 4 answers · asked by bithlobob07 1 in Cars & Transportation ➔ Motorcycles
the jet kit by it self, very little, if any. you install a jet kit if you change the exhaust, cams, air intake etc, and you usually rejet to make the mixture right so it isnt to lean for the modifications.
2007-01-20 14:42:39 · answer #1 · answered by mxlj 5 · 2⤊ 0⤋
A jet kit is only necessary for a few reasons
1. You are going to be in a dramatically higher or lower (relative to sea level) climate. If you are travelling and passing through it will be OK.
2. You have changed the AIR CLEANER ELEMENT to a higher flow. This allows in more air, therefore the bike will be running lean (bad). Pipes make almost no difference to carb. performance and functionality.
3. Engine mods (cams, heads, larger bore, etc) again, lean is bad for an engine.
If it is an 883 the best bang for the buck is have your cylinders machined to 1200cc by a good machine shop, put some good Wiseco, S&S, KB, etc. pistons in it (9.5:1 compression is a good streetable number), get some Andrews N2 cams, a good set of pipes (not drags, a 2 into 1 makes the best power in the most useable place) rejet to a 180 main, ride it 1000 or so miles, and check your plugs.
white=lean, go to a 185 jet
black=rich, try a 175
caramel color is spot on... elevation makes a difference in jetting, so you may need to try a few combinations.
don't waste a lot of money on kits though, just buy the jets for a few bucks apiece.
2007-01-20 23:01:04 · answer #2 · answered by Joe G 1 · 1⤊ 0⤋
None. It takes more than a bigger hole to give you more power. You change jets to match intakes and exhausts and other modifications. If you just put bigger jets in, all you'll do is waste gas.
2007-01-20 23:01:14 · answer #3 · answered by Nomadd 7 · 2⤊ 0⤋
My advise to you my cyber friend, Is check out www.sportster.org
you can find answers to many of your questions in both the tech & archive sections.
Stage 0: Stock
HP=40 for 883, 50 for 1200 (average)
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Stage .5 (also known as "The Harley Tax"): Stock plus:
SE Air Cleaner(1)
SE Slip-On Mufflers or equivalent(2)
Rejetting (DynoJet, Yost or just jets)(3)
HP=50 for 883, 60 for factory 1200(4)
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Stage 1: Stage.5 plus
883/1200 Conversion for 883s(5,6,7,8)
SE Ignition Module or adjustable one(9)
HP=60 for 883/1200, 65 for factory 1200
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Stage 1.5: Stage 1 plus
Andrews N2 cams (mild)(10)
HP=65 for 883/1200, 70 for factory 1200
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Stage 2: Stage 1.5 plus
Andrews N4, N8, or SE bolt-in cams instead of N2(11)
SE S1 Lightning or other bolt-on +/- 10:1 heads(12)
HP=75
Options: 2 into 1 header system, add +/- 7 hp(13)
SE carb (or equivalent), add +/- 3 hp(14)
XR750 (or other) valve springs, no gain(15)
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Stage 2.5: Stage 2 plus
Professionally ported 10:1 or higher heads
Matching (to head) domed pistons(16)
XR750 valve springs or SE cam kit(15,17)
2 into 1 header system(13)
SE,S&S Super E, or Mikuni HSR42 carb(14)
HP=90+
Options: big valves (big twin size), add +/- 5 hp(18)
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Stage 3: Stage 2.5 plus: (or:)
Big-bore cylinders and pistons and/or
Stroker kit and/or
Nitrous injection and/or
Supercharging
HP=?
Options: many
2007-01-23 14:22:38 · answer #4 · answered by Skull 5 · 0⤊ 0⤋