883 on jugs
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From: chillicothe mo
883 on jugs
i got questions hope somone got a answer or 2 i have this 1995 883 sportster that i bought stock exhaust no baffels screaming eagle ac jet sizes was 48slow and dynojet 190 main a friend of mine say the dyno jet 190 main is like a 215 keinen jet is this true? then he said that the reason they went with such of big jets is the 883 is now a 1200 the jugs say 883 but he said that some people will bore out the 883 jugs for 1200 kit is this true? so how do i tell for sure if it 883 or 1200 but that sounds like giant size jets for a little 883 could have been crazy people owned b4 me like to get your 2 cents thnx
Stellar HDF Member
Joined: Aug 2009
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Quick and dirty test:
Take out the spark plugs so you can rotate the cylinders. Have a dowel rod or stick or pencil, needs to be at least 6-7" long. You'll see why.
Rotate either cylinder to bottom dead center (BDC). You can tell this using your stick to find when the cylinder is as far down as it goes.
Then, push the rod as far as you can sideways so that it is touching the cylinder wall. This will put it at an angle instead of straight up and down. Mark where the rod hits the upper lip of the spark plug hole.
883: 5 1/2" approx.
1200: 5 7/8" approx.
____________________________
Dynojet main jets are typically smaller than Keihin. So yes, the 190 dynojet is equivalent to a 215 kehin. That is absurd for a main jet. Even heavily ported and cammed XL motors may not need that much jetting. And if he needed a 215 main, trust me, he'd have receipts for the thousands of dollars of engine work needed for that.
A 48 slow jet is also probably overkill. My 1250 only needs a 45, and I'm barely above sea level. If it is 1200, stick a 45 in there and adjust the mixture screw to fine tune. No need to go larger. A 180 (keihin) main should suffice for now. Dynojet kits use a different emulsion tube, so if you just want to swap a jet instead of getting a different emulsion tube get the DJ equivalent of that. That will cover a 1200 or 883. The main jet is only used at close to wide open throttle. You'll have to test it to determine proper jetting.
Take out the spark plugs so you can rotate the cylinders. Have a dowel rod or stick or pencil, needs to be at least 6-7" long. You'll see why.
Rotate either cylinder to bottom dead center (BDC). You can tell this using your stick to find when the cylinder is as far down as it goes.
Then, push the rod as far as you can sideways so that it is touching the cylinder wall. This will put it at an angle instead of straight up and down. Mark where the rod hits the upper lip of the spark plug hole.
883: 5 1/2" approx.
1200: 5 7/8" approx.
____________________________
Dynojet main jets are typically smaller than Keihin. So yes, the 190 dynojet is equivalent to a 215 kehin. That is absurd for a main jet. Even heavily ported and cammed XL motors may not need that much jetting. And if he needed a 215 main, trust me, he'd have receipts for the thousands of dollars of engine work needed for that.
A 48 slow jet is also probably overkill. My 1250 only needs a 45, and I'm barely above sea level. If it is 1200, stick a 45 in there and adjust the mixture screw to fine tune. No need to go larger. A 180 (keihin) main should suffice for now. Dynojet kits use a different emulsion tube, so if you just want to swap a jet instead of getting a different emulsion tube get the DJ equivalent of that. That will cover a 1200 or 883. The main jet is only used at close to wide open throttle. You'll have to test it to determine proper jetting.
Last edited by Scuba10jdl; Dec 22, 2014 at 07:42 PM.
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From: Bedford UK
At the time your engine was made the 883 jugs were very similar to the 1200 jugs and could simply be machined out to take the larger 1200cc pistons, a popular mod (later 883s need different jugs to go to 1200 or bigger).
Road Warrior
Joined: Jul 2006
Posts: 1,532
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From: Rochester N.Y.
Years ago the cylinders had enough material to machine them another 1/4" or .250" which makes it a 1200.
I don't think that's true anymore.
Most sportsters will use a #45 pilot and 170-180 main max for even the most stout builds.
The '95 should have a good jet needle already.
Mick
I don't think that's true anymore.
Most sportsters will use a #45 pilot and 170-180 main max for even the most stout builds.
The '95 should have a good jet needle already.
Mick
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