odb83
Scoot Junior
Posts: 13
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Post by odb83 on Jun 6, 2022 12:24:38 GMT -5
My son got a 2002 prebug 2t it running rough. I was about to do a tune up on it. I got carry away on buy stuff not knowing own a scooter really work. We live where there a couple of small hill so I thoughts more power it's going to be easier for him. So I bought all this.
Carburettor Polini CP 17,5mm Intake Manifold (21mm)unrestricted Reed valve Polini Evolution Air filter Polini Short 30° Black (48mm) Main Jet Set Polini PWK / CP - Choose : PWK/CP 80-98 Exhaust system Stage6 Street
But now after believing the online rep I thought I would be good, but reading quickly and watching videos I'm not sure if I put all this on , the scooter won't last.
I've put the needle jet one seat down (1 notch left) and put a 94 main jet in.
But now I'm thinking the 23mm intake and the polini pod is too much?? And risking to blowup the motor??? Should a Buy a adapter for the airbox to the carb and stick with the original Manifold?
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odb83
Scoot Junior
Posts: 13
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Post by odb83 on Jun 6, 2022 12:27:32 GMT -5
Could I run the pod with the cover 100% would that help prevent early wear and tear I know it now ideal compare to stock My son got a 2002 prebug 2t it running rough. I was about to do a tune up on it. I got carry away on buy stuff not knowing own a scooter really work. We live where there a couple of small hill so I thoughts more power it's going to be easier for him. So I bought all this. Carburettor Polini CP 17,5mm Intake Manifold (23mm) Reed valve Polini Evolution Air filter Polini Short 30° Black (48mm) Main Jet Set Polini PWK / CP - Choose : PWK/CP 80-98 Exhaust system Stage6 Street But now after believing the online rep I thought I would be good, but reading quickly and watching videos I'm not sure if I put all this on , the scooter won't last. I've put the needle jet one seat down (1 notch left) and put a 94 main jet in. But now I'm thinking the 23mm intake and the polini pod is too much?? And risking to blowup the motor??? Should a Buy a adapter for the airbox to the carb and stick with the original Manifold?
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Post by Zino on Jun 6, 2022 13:02:07 GMT -5
I really don’t like pod filters they are hard to tune for humidity temperature by the day can throw them way out of whack and at the lowest levels there are no performance gains just noise
The airbox is so much easier to tune for Your jet kit may not be big enough to give you a safe tune The pods really suck a lot of air and you big jetting too offset that
I would start with your biggest jet the 98 and see how that runs Ideally it is so big that your scoot is gurgle rich sluggish and sounds deep And then work down till it cleans up The faqs on the left have carb tuning steps
That is a good exhaust for ripping around he will have more power from top to bottom the stock transmission setting work well with it You could have got good results with the stock carb with a slight up jet with that pipe Properly tuned with air box and upgraded carb would take it up another notch
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odb83
Scoot Junior
Posts: 13
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Post by odb83 on Jun 6, 2022 14:51:44 GMT -5
I really don’t like pod filters they are hard to tune for humidity temperature by the day can throw them way out of whack and at the lowest levels there are no performance gains just noise The airbox is so much easier to tune for Your jet kit may not be big enough to give you a safe tune The pods really suck a lot of air and you big jetting too offset that I would start with your biggest jet the 98 and see how that runs Ideally it is so big that your scoot is gurgle rich sluggish and sounds deep And then work down till it cleans up The faqs on the left have carb tuning steps That is a good exhaust for ripping around he will have more power from top to bottom the stock transmission setting work well with it You could have got good results with the stock carb with a slight up jet with that pipe Properly tuned with air box and upgraded carb would take it up another notch If I go with 17,5 carb + stock air box + upgraded air filter that goes inside the air box + exhaust should my main jet kit that go up to 98 be enough? Thx
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Post by Zino on Jun 6, 2022 17:24:13 GMT -5
Still start out high and work down With the air box I bet you end up closer to 90 when she is tuned in The air box really tightens up and lowers the jetting need
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odb83
Scoot Junior
Posts: 13
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Post by odb83 on Jun 6, 2022 18:49:08 GMT -5
Still start out high and work down With the air box I bet you end up closer to 90 when she is tuned in The air box really tightens up and lowers the jetting need Should I lean the needle jet because I've moved it one notch richer thinking it would help with the pod but now going the other route.
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pili
Scoot Enthusiast
Posts: 209
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Post by pili on Jun 6, 2022 20:09:32 GMT -5
Zino is right tune with the stock air box and go from there. 2t's talk to you; the exhaust note will say a lot of where you are mixture wise. Get it close and check the plug for a cardboard color tan. Richening (raising) the needle a notch should improve the mixture at partial throttle with that can. I still think the best bang for your buck is a big bore kit.
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Post by Zino on Jun 6, 2022 20:30:37 GMT -5
Once you have the main dialed in . Which is the richest jet that gives best performance .
Work the needle from the bottom clip position and take the most responsive clip position running from 1/4 throttle to 3/4 throttle. If 2 positions feel the same take the richest one.
Then just fine tune the idle . You want good responsive performance going from idle to quarter throttle .
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Post by Zino on Jun 6, 2022 20:43:54 GMT -5
pili is spot on the engine as you start too rich will sound deep blub blub and sluggish performance. As you get in the right range the responsiveness will improve and sound will change . Mad hornets is the sound I shoot for When you go to the leaner side it will get higher pitched zing zing sound. I tune by responsiveness and top speed and y checking color on plug . I also run temp gauges and I want a main jet that levels my temps below 350 degrees on long 5 mile wide open runs. The needle at half throttle should level off at a notch lower temp . For the idle jet after it is real warmed up . Blip the throttle 3 things will happen The idle speed will stay high and hang up there or raise this is way lean . The idle speed drops back too idle on its own This is right on . It dips below cleans up and rises back to normal speed This on the rich side . Racers take the bottom one they want a idle jet that cools the engine when they shut the throttle on deceleration Daily riders take the middle or bottom one for safety . use this picture to check plug
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odb83
Scoot Junior
Posts: 13
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Post by odb83 on Jun 6, 2022 22:14:50 GMT -5
pili is spot on the engine as you start too rich will sound deep blub blub and sluggish performance. As you get in the right range the responsiveness will improve and sound will change . Mad hornets is the sound I shoot for When you go to the leaner side it will get higher pitched zing zing sound. I tune by responsiveness and top speed and y checking color on plug . I also run temp gauges and I want a main jet that levels my temps below 350 degrees on long 5 mile wide open runs. The needle at half throttle should level off at a notch lower temp . For the idle jet after it is real warmed up . Blip the throttle 3 things will happen The idle speed will stay high and hang up there or raise this is way lean . The idle speed drops back too idle on its own This is right on . It dips below cleans up and rises back to normal speed This on the rich side . Racers take the bottom one they want a idle jet that cools the engine when they shut the throttle on deceleration Daily riders take the middle or bottom one for safety . use this picture to check plug Thank a lot Second mistake Now I broke one of the bolt that hold seat hinge.I'm trying to find out if I can repair that easily.
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odb83
Scoot Junior
Posts: 13
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Post by odb83 on Jun 16, 2022 11:43:15 GMT -5
I really don’t like pod filters they are hard to tune for humidity temperature by the day can throw them way out of whack and at the lowest levels there are no performance gains just noise The airbox is so much easier to tune for Your jet kit may not be big enough to give you a safe tune The pods really suck a lot of air and you big jetting too offset that I would start with your biggest jet the 98 and see how that runs Ideally it is so big that your scoot is gurgle rich sluggish and sounds deep And then work down till it cleans up The faqs on the left have carb tuning steps That is a good exhaust for ripping around he will have more power from top to bottom the stock transmission setting work well with it You could have got good results with the stock carb with a slight up jet with that pipe Properly tuned with air box and upgraded carb would take it up another notch One more question before i install this do i leave the pilot/low jet alone? Or should i buy smaller or bigger jet? Or the one in the polini carb is good enough for now.
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Post by Zino on Jun 16, 2022 17:07:30 GMT -5
Most of the time the stock pilot jets are real close to what you need. A functional idle is all you really need that is running fast enough to keep your scooter running and rich enough so you dont have a hanging idle.
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odb83
Scoot Junior
Posts: 13
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Post by odb83 on Jun 16, 2022 21:17:37 GMT -5
Most of the time the stock pilot jets are real close to what you need. A functional idle is all you really need that is running fast enough to keep your scooter running and rich enough so you dont have a hanging idle. It have a 38 pilot for now. Should i get a kit in back up just in case? 32 to 40 jet or the 42 to 52. The only mod are gonna be the pipe and box polini air filter and polini 17,5 carb.
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Post by Zino on Jun 16, 2022 22:05:49 GMT -5
Main jet is the most important to have a wide range . If all your changing is the pipe you need to be richer in the higher rpm ranges .
I dont often change pilot jets just a 1/2 turn in either direction cleans up the idle.
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odb83
Scoot Junior
Posts: 13
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Post by odb83 on Jun 17, 2022 7:54:23 GMT -5
Main jet is the most important to have a wide range . If all your changing is the pipe you need to be richer in the higher rpm ranges . I dont often change pilot jets just a 1/2 turn in either direction cleans up the idle. Alright thank
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