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Post by sevenninesandtens on Jul 4, 2020 21:46:06 GMT -5
back at it today. went up to the 44 pilot jet and moved the needle down one. the backfiring is gone. Plug looks a little lean, waiting on batteries for the RPM meter so I can't dial it in till Monday when they arrive. Have had the body panels off while test riding and I'm wondering if that's part of the leaning out. no snorkel so I imagine it's getting more air then it would with the panels on. Gonna take it out tomorrow all put back together and check the plug again.
Thanks again everyone for the advice!
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Post by sevenninesandtens on Jul 7, 2020 10:59:06 GMT -5
even more nonsense. Now the gas gauge is stuck at 1/8 tank (even know it's full), and I can't find the high idle to tune. I get it started and let her warm up. turn the air screw in and the idle goes down till it stalls obviously, but turning it out it just keeps climbing and climbing. I adjust the idle screw to lower it and keep at it. The screw will come out 6 turns and the idle is still rising. The plug looks ok. With a 46 pilot jet the plug was wet, with a 44 the plug looks pretty good but it won't idle. I'm lost.
If I give it some gas the RPM's hover between 2000-2250 for a bit then it settles back to 1800-1950. IT doesn't ever stay steady.
The electric start doesn't turn the engine over anymore either. just makes a dry cough sound. kicks over pretty easily with the kick starter though.
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Post by sevenninesandtens on Jul 7, 2020 11:49:20 GMT -5
I think I need a smaller pilot jet. I put the 38 which came stock, and at 3 turns out it's ok. However if I give it gas and let go of the throttle the RPM's dip down to 1300 before they come back up after a little bit to 1800ish. Should I put the snorkel back on and see? Gonna try that after lunch.
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Post by sevenninesandtens on Jul 7, 2020 12:58:42 GMT -5
Here's pics of the spark plug.
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Post by sevenninesandtens on Jul 7, 2020 12:59:29 GMT -5
May have to try the Polini air filter I have since it's still looking rich(?) with a 38 pilot jet in there.
Or would I move the needle clip up? it's in the 4th position now so only one more groove below the clip.
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Post by sevenninesandtens on Jul 7, 2020 16:21:40 GMT -5
this thing is all over the place. 42 pilot jet, needle in the lowest richest setting. new plug. not a mark on it so it's lean. Can not get the RPM's to settle ever. Going to go back up on the pilot. I feel like a dog chasing his tail. Round and round I go getting nowhere at all.
guess I'll go back to the 44PJ. Frustrating.
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Post by Zino on Jul 7, 2020 17:44:23 GMT -5
Take a look at the plug this way You are on the rich side Your plug looks wet .
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Post by Zino on Jul 7, 2020 18:09:35 GMT -5
Air screw setting For pilot jet if you less than 1 turn out you need to go to a richer pilot over 2 1/2 turns out go to a smaller pilot A lean pilot jet setting will cause your engine to surge at very low RPM’s, bog or cut-out when the throttle is opened quickly and have trouble idling down.A rich pilot setting will result in hard starting, plug fouling at low RPM’s, sputtering as the throttle is cracked opened.
The pilot jet isn’t difficult to set. With proper air screw adjustment and a close initial setting fine-tuning should be painless. Once set the pilot jet is not terribly sensitive. You should only be required to adjust the setting when confronted with large weather changes or altitude swings of over 2000 ft.
If adjusting the pilot jet gives inconsistent feedback, or does unexplainable things. Check and clean out the pilot/slow speed system thoroughly with carb cleaner and blow out with compressed air.
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Post by repherence2 on Jul 7, 2020 22:03:59 GMT -5
^^^Zino got it. It's fairly simple if you stay within the 1-2½ turn bandwidth as Zino explained. Air mixture screw turns cue you in to which way to go on the pilot jet. As for the needle, if i cant have it set to the middle clip position, i fiddle with the main jet.
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Post by sevenninesandtens on Jul 8, 2020 16:50:50 GMT -5
Sigh. What's it mean when the plug looks rich but the idle won't sit still? Put the 46 in and it's rich. The flat ring part is dark and wet looking. top few threads are too, like first 2 or 3. Yet when I try to get the idle to settle it won't. I'm at 1.5 turns out with the air screw. If I go in the RPM's drop until it stalls. If I turn the screw out the RPM's just keep climbing. The RPM's don't stop climbing no matter how far I turn it out. Am I confusing the finding the high idle bit? How does one do that? I assumed you turn that screw until the RPM's stop going up? Mine don't ever stop. Carb is brand new and the jets are clear. What the heck am I doing wrong? Here's the plug with the 46 Pilot Jet.... Here's the 44 Pilot Jet both look rich, but both do the same thing. Acting lean, the RPM's don't run away but they also don't settle at idle. If I give them gas while idling around 1800-1900 it drops to below 1500 before climbing back up. Spark plug is torqued to spec, checked the cylinder head bolts too and they are to spec. There's no air leaks when I did the leak down test. Oh also both air screws were 1.5 turns out. Am I missing something? I dunno what to do. I have one more new plug that I can throw in and test the 42 Pilot Jet. Pretty sure the 38 gave me a plug with nothing on it. I don't have a 40 to try though.
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Post by Zino on Jul 8, 2020 17:33:39 GMT -5
Every plug picture you are showing is very rich if that is just from a couple miles of running you are extremely rich. Looking at your posts you keep turning the air screw out on each pilot jet beyond 2 turns . That is adding air to offset the size of the pilot jet . Which is leaning it out . Stay with the 38 . Just adjust the screw till you get a smooth fast idle . If you are not the absolutely fastest idle you are on the rich side .
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Post by sevenninesandtens on Jul 8, 2020 18:01:18 GMT -5
So I was zigging when I should have been zagging this whole time?!
I was just idling those plugs too, with 1 or 2 throttle pulls here and there. Ok I'll go back down to the 38. So I haven't been able to get the fastest idle (which I'd then bring back down to 1800 for my idle speed?) because I'm too rich? Thanks for being so helpful and patient. This is my first time tinkering with a motorized vehicle. I can tune the crud out of a bicycle, I guess only cause they don't have carbs! at 43 yrs old I'm late to the tinkering party.
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Post by Zino on Jul 8, 2020 18:25:24 GMT -5
Put the 38 set the air mixture screw at 1 1/2 turns out . Now take the the idle screw and go out to 2 turns out . Does the idle smooth out and run a touch faster or does it go worse If better go another half turn out .
If worse at 2 turns out see if one turns out runs better than 1 1/2 turns out and 2 turns out .
Do not adjust needle or main till you find the smoothest idle . Before we had tachs we just tuned by ear and feel .
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Post by Mech Warrior on Jul 9, 2020 23:17:34 GMT -5
Thats a nice impact you got there
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Post by sevenninesandtens on Jul 11, 2020 21:32:10 GMT -5
Thats a nice impact you got there Thanks! it's actually my wife's. She got it when we first started dating. It's our most used tool. I use it so much we killed 2 batteries in 4 yrs.
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