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Post by scooternewby on Jun 24, 2013 20:14:03 GMT -5
I was thinking about going JUST a little bigger in size on the jet in my carb.
From a 107 to a 115. Can I just swap it? Or will I need to modify any else at the same time?
Thanks
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Post by Deleted on Jun 24, 2013 20:45:14 GMT -5
You need to have a reason to up jet. Is it lean?
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Post by scooternewby on Jun 24, 2013 23:10:35 GMT -5
I believe so.
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Post by alleyoop on Jun 24, 2013 23:23:34 GMT -5
Is this a 2 stroke 50cc, 4 stroke 50cc ? or a 150cc 4 stroke? If it's a 50cc 2 stroke or 4 stroke EVEN the 107 is WAY to big. So if yours is sluggish it is because it is getting to much gas and your motor is loosing power.
150cc with a 24mm carb come with Main jets from 103-107 and to take a 115 is when someone puts on a FREE FLOW FILTER and a Free Flow muffler and even then sometimes they have to go down to a 110 or a 112 main jet.
Alleyoop
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Post by scooternewby on Jun 24, 2013 23:44:26 GMT -5
It's a 49cc 2 stroke and I may be incorrect about the jet size. It was really dark!! I'm just getting a hesitation at WOT and it's getting annoying. New plug. Good gas. Great compression, it's all there.
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Post by alleyoop on Jun 24, 2013 23:57:17 GMT -5
You scared me there for a minute No it does not have a 107 main jet. Do you have any mods on the scoot, performance exhaust and or air filter.
If it is stock, all you need to do is adjust the AIR RATIO on it that is the screw new the AIR FILTER SIDE on the CARB. The middle screw is the IDLE SPEED SCREW.
If it was running good when the temps were cooler in the 60s and now the temps are 70+ you need to LEAN it out a little, Turn that screw near the AIR INTAKE COUNTER CLOCKWISE 1/8 of a turn and give that a shot. 1/8 of a turn on those carbs effect it quite a bit so do not go to much at a time only 1/8 turns and then try it.
Alleyoop
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Post by scooternewby on Jun 25, 2013 2:12:03 GMT -5
Lol sorry!! And yes, it's all stock, no mods. Ill try the air mix screw tomorrow. Fingers crossed
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Post by skuttadawg on Jun 30, 2013 1:50:11 GMT -5
My 2T came with a 68 MJ and I replaced it with a 75 and it was perfect . I installed a small Uni vent cover as an airfilter with a  and it had more power . Tried the big red Uni and it bogged . It now has a 47mm BBK , Uni and racing pipe and I used a 120 but it sucked gas . Tried a 130 and it would spit gas out of the Uni and bog . I now have a 105 and it runs good but I want to test a 110 and 115 as a 2T is picky . Now I have a 19mm carb where many have a 17.5mm or smaller carb and do not need jets as large as that . With a 2T you always want to be a hair rich to be safe as if lean you are at risk of a soft seize as it will run hot and the piston expands and get stuck . A soft seize you may get lucky after it cools and you upjet but a bad seize will have you rebuilding the engine |
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Post by gitsum on Jul 6, 2013 13:07:23 GMT -5
107 to 115 is a big jump. I didn't even know there was a 107.
Anyhow if you need more fuel, bumping up to a 110 would be better to try first.
That being said, if you have a stock 49cc two-stroke, there's no way it came with a 107, it would barely (if at all) run when you twisted the throttle open...
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..BAD TO THE BONE..
and it had more power . Tried the big red Uni and it bogged . It now has a 47mm BBK , Uni and racing pipe and I used a 120 but it sucked gas . Tried a 130 and it would spit gas out of the Uni and bog . I now have a 105 and it runs good but I want to test a 110 and 115 as a 2T is picky . Now I have a 19mm carb where many have a 17.5mm or smaller carb and do not need jets as large as that . With a 2T you always want to be a hair rich to be safe as if lean you are at risk of a soft seize as it will run hot and the piston expands and get stuck . A soft seize you may get lucky after it cools and you upjet but a bad seize will have you rebuilding the engine 