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Post by 139qmb on Jul 28, 2021 13:58:57 GMT -5
I understand that air is thinner (less oxygen) at higher elavations and would require a smaller main jet. I am at directly beside the sea and year round the temps never drop below 65 or higher than 95. I have a 50cc with UNI and Technigas exhaust pipe. I have changed the main jet from 76 (stock size) to 85, and it runs well. The RPMs are 7300 to 7600 at WOT with 5g rollers. I will be changing to 6.5g Dr. Pulley sliders this weekend. I had 6g rollers before the 5g and could reach slightly higher top speed given a long enough time. I am also running red clutch springs and 1k NCY contra spring. I weigh 155lbs.
I know that 85 is usually the main jet used with a big bore kit.
So my question is should I try the next size up in my kit which is a 90?
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Post by Zino on Jul 28, 2021 16:39:46 GMT -5
Sure keep going up to see if it performs better .
With the UNI filter you may have to go any higher .
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Post by scooter7878 on Jul 29, 2021 1:24:36 GMT -5
I keep going up watching rpm and speed and how it feels and sounds. As long as power stays same and rpm stays Same or continuous getting higher I keep going up till I get a decrease in power speed or rpm and I go down one sizes will hear and feel the happy spot it will just sound and feel the best
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Post by scooter7878 on Jul 29, 2021 1:28:29 GMT -5
It also depends on what size carburetor u have on. My 50mm bbk and bvh with a 21mm cvk carb I ran a 100 main when I swapped the carb for a 21mm oko flat slide carb u kept thinking I needed big but I got all way down to 88 is the happy spot now I installed a airsal 50mm domed piston and a stroker crank and 95 is happy. I'm also at sea level about same temps
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Post by 139qmb on Aug 10, 2021 9:28:09 GMT -5
Was hoping for more replies. I pulled the plug and it was black which is a sign of too rich. I decided to go way down in size to a 78, 76 was stock. I went on 20 plus mile ride and it ran fine, maybe even helped the 0-30MPH times. This weekend I will go back to the 80 and stay there until my 5.5g and 6g slider weights come in the mail. I am currently running 6.5g sliders but the RPMs are staying around 6700-7000. I want to get the RPMs up closer to 7900-8100. I just know there is a balance to be met for the weights to still allow the variator to open all the way for top speed.
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Post by mikehailwood on Aug 10, 2021 12:56:20 GMT -5
What year is your Agility and what is your top speed?
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claydoh
Scoot Enthusiast
Posts: 172
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Post by claydoh on Aug 10, 2021 14:20:14 GMT -5
Was hoping for more replies. I pulled the plug and it was black which is a sign of too rich. I decided to go way down in size to a 78, 76 was stock. I went on 20 plus mile ride and it ran fine, maybe even helped the 0-30MPH times. This weekend I will go back to the 80 and stay there until my 5.5g and 6g slider weights come in the mail. I am currently running 6.5g sliders but the RPMs are staying around 6700-7000. I want to get the RPMs up closer to 7900-8100. I just know there is a balance to be met for the weights to still allow the variator to open all the way for top speed.
I just went back to stock 6g rollers on my scoot, from 6.5 (actually 7g sliders). I hit mid-upper 7k rpm now, up from a max 7200. Increased my top speed a little, too, at least from one ride  , overall performance seems better, so I'll order some sliders.
Which jet does have many different variables, including engine size, carb, etc etc. so trial and error and adjustment is the only sure fire way.
My last scooter despite having identical specs (and even some parts like the carb) used a different jet (90) than my current ride (93)
when looking at the plug, do look down in to the insulator, looking for that nice brown-ish color there.
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Post by 139qmb on Aug 10, 2021 14:29:26 GMT -5
What year is your Agility and what is your top speed? 2013, 28-31 on hills, 37-40 on flats, 40-45 with any amount of downward grade. Wind of course will have an affect. I weigh 155lbs. |
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Post by 139qmb on Aug 23, 2021 6:57:20 GMT -5
Installed the 5.5g Dr. Pulley sliders. Still running the 78 main jet. It runs great, 7300-7800 RPMs at WOT. The engine does not bog at any point; however I will go up to the 80 and see what affect that has on RPMs and top speed.
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Post by ThaiGyro on Aug 25, 2021 20:29:21 GMT -5
Just a side note...I saw no mention of humidity. My sea level experiences held much issue with 95F/35C at sea level with 45 to 90% swings in humidity.
My resolution was oversize carb bodies (more air) with much range in pilot play...Your pod filter really complicates that...twitchy/funky between pilot and main.
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Post by scooter7878 on Aug 25, 2021 21:54:06 GMT -5
Just a side note...I saw no mention of humidity. My sea level experiences held much issue with 95F/35C at sea level with 45 to 90% swings in humidity. My resolution was oversize carb bodies (more air) with much range in pilot play...Your pod filter really complicates that...twitchy/funky between pilot and main. . Yeah my bike is super finiky to air temp and humidity some days it's way way slower and less power than next day it runs like a raped ape |
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Post by steve1297 on Sept 17, 2021 2:03:49 GMT -5
Rich is good. As long as it does. As long as it doesn't inhibit performance, keep it running rich. Rich = much cooler.
I have a 52mm BBK, with a huge 26mm flat slide carb, and I use a 110 main.
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Post by scooter7878 on Sept 17, 2021 3:35:02 GMT -5
Rich is good. As long as it does. As long as it doesn't inhibit performance, keep it running rich. Rich = much cooler. I have a 52mm BBK, with a huge 26mm flat slide carb, and I use a 110 main. yeah if I go to a 90 my wot rpm's go down by a few hundred and I loose some top speed. U check my plug often and I don't run hot well I got no temp gauge at the moment but I run hard in Florida heat with no issues I got probably around 3500 miles on my rebuild no piston issues or sign of overheating I ran a 105 to 108 with a 20mm cvk but my oko 21mm just don't like anything more than 88 but it uses the hex style main jet I'm not sure maybe there flow sized differently than round style didn't see what brand flat ur running do u use the round or hex style in ur carb? |
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, overall performance seems better, so I'll order some sliders. 
