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Post by 2TDave on Oct 19, 2014 16:02:08 GMT -5
What filter, main jet and needle position are you running now?
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Post by Elektrey on Oct 19, 2014 16:32:25 GMT -5
What filter, main jet and needle position are you running now? modified open air filter, 75 MJ, lowest needle position. I could try opening up the air filter some more. |
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Post by 2TDave on Oct 19, 2014 17:03:52 GMT -5
Those settings just don't make since to me. You've got a small main but the needle at it's richest setting on an open filter that your trying to regulate flow through and thereby tune the carb. I'm a tried and true guy and I don't think your ever going to get consistent results until you tune the carb properly. Just my two cents.
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Post by Elektrey on Oct 19, 2014 17:15:34 GMT -5
I realized I had the idle air mixture screw set to completely shut so I opened it and opened up the air filter a bit and it runs a lot better now. Won't die and takeoff is only a tiny bit rough for a small portion of the powerband. Should be able to get it in tune from here.
I'm not sure why it doesn't make sense to you. I don't see why tuning the air fuel ratio makes any difference whether you tune the air or the fuel. I had it consistently tuned, it's just that I switched oils and now maybe because of the different viscosity of the oil it needed to be retuned. dunno
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Post by moofus02 on Oct 19, 2014 17:21:04 GMT -5
With open filter a 75 mj is small and the rich needle would explain the smoke. If you are pre mixing it would explain the smoke and if so that mj is way to small. I'm with Dave tune the carb to idle needle center clip and don't worry about anything but wide open till the mj is right
Sent from my SPH-L720 using proboards
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Post by moofus02 on Oct 19, 2014 17:28:14 GMT -5
Most tune from the mj down so the fuel is right WFO then adjust the rest so there isn't a lean spot. You make carb adjustments they effect only one portion of the throttle range. You make air adjustments they effect the entire carb tune
Sent from my SPH-L720 using proboards
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Post by Elektrey on Oct 19, 2014 17:32:39 GMT -5
Most tune from the mj down so the fuel is right WFO then adjust the rest so there isn't a lean spot. You make carb adjustments they effect only one portion of the throttle range. You make air adjustments they effect the entire carb tune Sent from my SPH-L720 using proboards Yeah that is true. But if I tune for WOT with air adjustments, the rest can be tuned from that point via idle mix screw and clip. (which I have done). And just to clarify: I think the other 2 spark plugs were oil fouled. Im going to try to clean them off but the new spark plug did not give the same problem as the others. It's just tuning from here I believe so I think my issue is solved. |
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Post by 2TDave on Oct 19, 2014 17:47:38 GMT -5
Your trying to tune with air which is very inconsistent. Changes in temperature, humidity and elevation all affect air density and this is why you will never have a consistent tune. Yes those will affect a tuned carb but it will be minimal because the fuel that is more consistent is tuned properly. If your theory worked we would all split a 2 dollar roll of duct tape instead of having 40 dollars of jets a piece.
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Post by moofus02 on Oct 19, 2014 17:57:01 GMT -5
Your trying to tune with air which is very inconsistent. Changes in temperature, humidity and elevation all affect air density and this is why you will never have a consistent tune. Yes those will affect a tuned carb but it will be minimal because the fuel that is more consistent is tuned properly. If your theory worked we would all split a 2 dollar roll of duct tape instead of having 40 dollars of jets a piece. 40 I've probably got 3 times that in jets lol but that includes needles and the other jets the del uses Sent from my SPH-L720 using proboards |
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Post by 2TDave on Oct 19, 2014 18:16:10 GMT -5
Yeah I didn't include those. Lol.
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Post by Sitticuss on Oct 19, 2014 18:31:48 GMT -5
Your trying to tune with air which is very inconsistent. Changes in temperature, humidity and elevation all affect air density and this is why you will never have a consistent tune. Yes those will affect a tuned carb but it will be minimal because the fuel that is more consistent is tuned properly. If your theory worked we would all split a 2 dollar roll of duct tape instead of having 40 dollars of jets a piece. Wow you make it sound like it changes every day, and you need to retune constantly. |
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Post by 90GTVert on Oct 19, 2014 18:31:59 GMT -5
Jets, rollers, springs... essentials if you wanna mess with scooters IMO. I think of them like baseball cards and grab the ones I don't have when I get a chance so I can complete the set. lol
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Post by Sitticuss on Oct 19, 2014 18:32:50 GMT -5
Your trying to tune with air which is very inconsistent. Changes in temperature, humidity and elevation all affect air density and this is why you will never have a consistent tune. Yes those will affect a tuned carb but it will be minimal because the fuel that is more consistent is tuned properly. If your theory worked we would all split a 2 dollar roll of duct tape instead of having 40 dollars of jets a piece. 40 I've probably got 3 times that in jets lol but that includes needles and the other jets the del uses Sent from my SPH-L720 using proboards Some people have a $ issue and can't afford three of everything |
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Post by 90GTVert on Oct 19, 2014 18:35:40 GMT -5
Your trying to tune with air which is very inconsistent. Changes in temperature, humidity and elevation all affect air density and this is why you will never have a consistent tune. Yes those will affect a tuned carb but it will be minimal because the fuel that is more consistent is tuned properly. If your theory worked we would all split a 2 dollar roll of duct tape instead of having 40 dollars of jets a piece. Wow you make it sound like it changes every day, and you need to retune constantly. Prob not so rough on you FL fellas, but here in winter I may go out in the day when it's 40-50 and run rich and then run lean at night when it's 20. Really fun stuff. Last year from summer to winter I transitioned across 10 jet numbers and then back down when it started warming up. Depends on the setup though. With stock airboxes, snorkels in place, etc... they don't react so much. Open air filters are horrible for changing weather. |
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Post by Sitticuss on Oct 19, 2014 18:39:39 GMT -5
I realized I had the idle air mixture screw set to completely shut so I opened it and opened up the air filter a bit and it runs a lot better now. Won't die and takeoff is only a tiny bit rough for a small portion of the powerband. Should be able to get it in tune from here. I'm not sure why it doesn't make sense to you. I don't see why tuning the air fuel ratio makes any difference whether you tune the air or the fuel. I had it consistently tuned, it's just that I switched oils and now maybe because of the different viscosity of the oil it needed to be retuned. dunno Sounds like your getting somewhere. I keep my air mix screw out about 1 1/4 turns. If i screw it out much more it dies and bogs out when I try to go more than 10mph. Just do some plug chops to make sure your not running to lean |
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