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Post by Mech Warrior on Jul 11, 2020 23:20:13 GMT -5
Well i guess its a good one. Who makes that? I had a hyper tough walmart special for about 4 months.Impact driver worked great , then one day it had scratches all over it and cracked plastics , I think the grand kids were playing lets see how far we can throw grandpas drill.Long story short i'm in the market for something a little more reliable and this time ill keep the grand kids away from my impact driver!
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Post by sevenninesandtens on Jul 12, 2020 20:10:50 GMT -5
Well i guess its a good one. Who makes that? I had a hyper tough walmart special for about 4 months.Impact driver worked great , then one day it had scratches all over it and cracked plastics , I think the grand kids were playing lets see how far we can throw grandpas drill.Long story short i'm in the market for something a little more reliable and this time ill keep the grand kids away from my impact driver! It's a Hitachi, but they changed their name to Metabo in the last few years.
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Post by sevenninesandtens on Jul 17, 2020 10:08:23 GMT -5
Ok getting better now. Got a set of 32-40 pilot jets and started with the 40.
With the 40 I ended up at 3 3/4 turns out on the air screw when the rpms started to come back down.
Put the 38 in and the air screw was turned out 3 1/4 turns out when the rpms plateaued and started falling.
So I’m seeing progress but ran out of daylight last night. Going to keep going down the pj’s till I get to 1 1/2 -2 turns out.
Question though: Exhaust gas should be warm or hot I assume? Mines barely lukewarm. Cool even. Without knowing or looking it up I’m guessing that’s due to being rich still? Or is there no correlation there? My CHT gauge should be here this weekend so I’d get a better idea with that. Just thought it was odd that the fumes weren’t hot at all.
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Post by sevenninesandtens on Jul 17, 2020 14:52:42 GMT -5
32 Pj works best. 2 turns out on the air mix screw. I never would have expected it to be so low. Stock carb had a 46 so I started there. Wild.
Now on to the needle and main jet. Finally getting there I hope.
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Post by Zino on Jul 17, 2020 21:42:30 GMT -5
Nice work 2 turns out is a good spot Now for the main go real big and come down Realize with your rich pilot that was flowing over to your main So go bigger than you were before and what you think So start bigger than you were find the gurgly wide open jet and then work your way down . If you are just a little gurgly you are within 5% on your jetting.
Listen for Sound Gurgly rich will sound deeper .BWahh BWah Bwah As You come down the sound will be less deep . You do Not want to hear zingy you are going lean .ZING ZING ZING
I like to find gurgly rich and And do speed runs I track speed as I go down from gurgly rich I take the highest speed if 2 are the close I take the richer one for safety .
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Post by sevenninesandtens on Jul 18, 2020 15:58:32 GMT -5
Nice work 2 turns out is a good spot Now for the main go real big and come down Realize with your rich pilot that was flowing over to your main So go bigger than you were before and what you think So start bigger than you were find the gurgly wide open jet and then work your way down . If you are just a little gurgly you are within 5% on your jetting. Listen for Sound Gurgly rich will sound deeper .BWahh BWah Bwah As You come down the sound will be less deep . You do Not want to hear zingy you are going lean .ZING ZING ZING I like to find gurgly rich and And do speed runs I track speed as I go down from gurgly rich I take the highest speed if 2 are the close I take the richer one for safety . Just took it out for a test. Kept the RPM’s below 7k. Sounded zingy. Temp went up to 306°. It’s hot today though, 92°. I didn’t go above 1/4 throttle so I’m assuming I’m a little lean down there. Should I keep fiddling with the idle or work on the main jet, which is an 80 currently and then needle then the pilot again? Also have a hard time kicking it over. It turns over then sputters till it turns off. Takes about 10-15 kicks to get it going and I have to give it some throttle while it starts up. Is that also because it’s lean in it idle circuit? I’d post a pick of the plug but I can’t seem to figure it out on my phone.
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Post by Zino on Jul 18, 2020 16:58:23 GMT -5
Idle mixture circuit is done for now Turn idle speed up a quarter turn .
AS long as you can get it to start and idle move on to the main and then the needle and then you may being doing a quarter turn rich or lean on the mixture screw after the others are set right.
You need to do wide open runs Work on the main Get your biggest main jet and work your way down It should be so big that it is gurgly rich if possible .
The main is the most important jet on these scoots since you spend so much time wide open to get results . A functional idle is all you need Who idles on these things any ways . Alot of models allow no adjustment for idle mixture or needle Genuine buddy for example. The needle is less important on stock motors than the idle and more important on built up motors
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Post by Zino on Jul 18, 2020 17:08:07 GMT -5
So after you have the main in a safe place a Acid test is go wide open for 4-5 miles . Your temps should settle in under 350 degrees and just hover around a number . Outside temps and humidity will effect what number it settles at For example My vinos run at 9000 rpms peak malossi sport malossi wild lion they tend to find a home around 320 degrees giver or take on a wide open run of 10 miles on my way home from work . The Zuma with Malossi and yasuni r runs at 9800 rpms jetted is more in the low 340 s where it finds a home . On real humid days they run hotter But they still level off .
You know you are still lean if she just keeps climbing . If you spend alot of time above 350 you get closer and closer to seizing . Now it is not 352 degrees boom you seize most kits have another 30-40 degrees plus depending on tolerances .
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Post by sevenninesandtens on Jul 19, 2020 14:36:38 GMT -5
Idle mixture circuit is done for now Turn idle speed up a quarter turn . AS long as you can get it to start and idle move on to the main and then the needle and then you may being doing a quarter turn rich or lean on the mixture screw after the others are set right. You need to do wide open runs Work on the main Get your biggest main jet and work your way down It should be so big that it is gurgly rich if possible . The main is the most important jet on these scoots since you spend so much time wide open to get results . A functional idle is all you need Who idles on these things any ways . Alot of models allow no adjustment for idle mixture or needle Genuine buddy for example. The needle is less important on stock motors than the idle and more important on built up motors There’s no where near by that I’d be able to go WOT for 4-5miles haha. I live in Philadelphia. There’s traffic lights every block. I’ll do the best I can with that. I went out today with the 98 main jet and I have no WOT. I get to about 3/4 and then there’s no power and the RPM’s start to drop. Gonna see how the next lower jet works in a few. Aside from that though the mid throttle had some bogging on the early part of the throttle but once it came back it takes off like a bat outta hell meatloaf style. RPM’s get to about 7700 and then start to drop with the power loss emptiness and engine temp topped out at 279°. Assuming that’s pretty rich with the engine being so cool. It’d be fun if these engines weren’t so temperamental lol. The building it was fun. Tuning not so much. More irritating than anything but that’s my fault for throwing everything on at once. And I’m off to see the wizard of main jets! Brb
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Post by Zino on Jul 19, 2020 16:17:17 GMT -5
Carb tuning is about being methodical one circuit at a time . Once youlearn the sound and feel of rich and lean it is way easier .
If 98 is that boggy drop to the 94 Do not touch the needle till main is right .
But here is how to work that next circuit. For the needle you just take the one that has the best throttle response if 2 settings are close take the richer one . You no your needle and idle are married closely when you come off a wide open run at every stop light after the scoot is very warm your rpms should drop all the way down to idle speed .It should not be" a hanging Idle" at 2500 or 3000 rpms . It should just drop down and smooth out to a couple hundred rpms within whereever you settled your idle speed at at initial tune
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Post by Zino on Jul 19, 2020 16:35:29 GMT -5
Your closer than you think to a safe tune . one afternoon get the main right .
If your idle doesnt hang your needle is close to right or one clip off . If it hangs you might me 1 or two clips off .
Here is my best guess where you end up 88 or 90 Main jet 2nd clip from the bottom on the needle 38 pilot 1 1/2 to 2 turns out
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Post by sevenninesandtens on Jul 20, 2020 20:44:04 GMT -5
Your closer than you think to a safe tune . one afternoon get the main right . If your idle doesnt hang your needle is close to right or one clip off . If it hangs you might me 1 or two clips off . Here is my best guess where you end up 88 or 90 Main jet 2nd clip from the bottom on the needle 38 pilot 1 1/2 to 2 turns out Yeah I’m down to the 92 right now. Still a little gurgly but it was way too hot today to tinker. 101° I did get new turn signals though. One of the lenses are broken on mine and a replacement OEM one was $41, 4 new lights were $14.... not a hard choice there. The scoot is rideable at least, ripping around WOT was a blast so I’m finally excited to get it dialed in.
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Post by Zino on Jul 20, 2020 21:08:04 GMT -5
Your getting close within a jet . If it felt good ripping around wide open and cleaned up that power lag at 3/4 throttle and above . You might be all done when you swap in the 90. You could run that jet for awhile and see if you like it . If you are not fouling plugs and have a brown to black color on your plug At worst your a notch rich but safe .
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Post by sevenninesandtens on Jul 24, 2020 17:06:12 GMT -5
Your getting close within a jet . If it felt good ripping around wide open and cleaned up that power lag at 3/4 throttle and above . You might be all done when you swap in the 90. You could run that jet for awhile and see if you like it . If you are not fouling plugs and have a brown to black color on your plug At worst your a notch rich but safe . Weather has been so bad I haven't had anytime to bother with her. Did get a fuel filter in the mail though so I'll have that to add.
Tomorrow is looking pretty good. It's been either too damn hot 100+ F or monsoon rains on the days it wasn't 100.
It takes a bit to get her started and have to give it some gas for a bit while she warms up. That's from being lean in the idle? Hoping to get the electric start working again too. One thing at a time though.
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Post by sevenninesandtens on Jul 25, 2020 21:15:09 GMT -5
Ok wouldn't start today until I put the 36 pilot jet in. The RPM's keep running up on me. Lean right? So I check the plug and at the base where the washer is (in this case it's the temp gauge), is wet. Like the mix is leaking out of the spark plug hole. I have the plug set in at 20ft lbs. Not sure if Polini has a different torque number though. Somehow I doubt it.
So would that be causing my issues of it acting lean but the plug being wet meaning it's rich?
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