Clinician
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Post by ryanosalien on Oct 6, 2015 17:01:58 GMT -6
Hey,
Well I'm trying to get this carb to tune and idle correctly, I'm 850ft above sea level, carb came stock with a 35 idle jet and a 120 main jet and I can't get the scooter to idle unless I hold the throttle wide open, is there any 1 else out there gotten a good tune or a idea of what jets I should use to get a good idle?
Current Mods:
Ebay performance blue cdi
Uni filter
12g roller weights
Koso clutch
1500 main spring and clutch springs
120 main jet in Stock carb.
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Post by Alleyoop on Oct 6, 2015 17:29:17 GMT -6
If your holding the throttle wide open the rpms should be pretty high in other words the motor should be turning the rear wheel pretty fast.
Have you adjusted the IDLE using the IDLE SPEED SCREW?
Have you adjusted the carbs FUEL RATIO MIXTURE?
WHAT ADJUSTMENTS HAVE YOU DONE.
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Clinician
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Post by ryanosalien on Oct 7, 2015 19:15:21 GMT -6
To begin with I adjusted the idle mix screw 2 turns out and got it to start but only when I'm holding the throttle wide open, 2nd attempt I turn idle mix 2 1/2 and couldn't get it to start even with the throttle wide open and like wise with 3 turn on idle mix screw, all with a 120 main jet and 35 idle jet, I have on hand I could try a 32 idle with either a 120 main or a 114 main, but it's a pain to keep pulling jets so I figured I would ask ppl who has a 30mm tuned carb what they used
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Post by Alleyoop on Oct 7, 2015 19:30:12 GMT -6
WHen you can get it started with the throttle wide open is it idling or revving high?
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Post by czmdiver on Oct 8, 2015 4:33:33 GMT -6
Hey, Well I'm trying to get this carb to tune and idle correctly, I'm 850ft above sea level, carb came stock with a 35 idle jet and a 120 main jet and I can't get the scooter to idle unless I hold the throttle wide open, is there any 1 else out there gotten a good tune or a idea of what jets I should use to get a good idle? Current Mods: Ebay performance blue cdi Uni filter 12g roller weights Koso clutch 1500 main spring and clutch springs 120 main jet in Stock carb. This is a 30mm Carb on a Otherwise Stock 150? Stock Exhaust? |
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Post by cyborg on Oct 8, 2015 7:05:30 GMT -6
i call plugged up jets
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Post by Alleyoop on Oct 8, 2015 10:47:29 GMT -6
Yes try the #32 pilot and 114 main to much fuel for your stock motor. Just to get an idea my motor is bored out with a stroker to 182ccs and the carb is a 24mm with #38pilot and 122.5. If a motor is stock and you add free flow filter and free flow exhaust you bump up ONLY THE MAIN JET by at least 4 sizes from what is in there. But slapping in a 30mm carb that usually come with the 250s on a basically stock motor that is called over carbing a motor, to much fuel and to much air.
If you still cannot tune it right just slap the 24mm back on with a #35 pilot and the 114 main jet and it should run really good.
Alleyoop
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Doc's Anything Goes
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Say no to scooter abuse
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Post by jct842 on Oct 8, 2015 14:18:55 GMT -6
Isn't 30mm a bit too big for a 150? About 7 or 8 years ago there was a service man on the old scooterdog forum who fought a 30 mm for about a year to get it tuned right for a 150 and got transferred before it ever ran right. Getting a too big of a carb to work at all rpm ranges is tricky. Would be better off to use a 24mm. A 24mm will work just fine on a 200cc motor and if my 180cc riva carb takes a crap it will be replaced with a 24mm chinese scooter carb.
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Post by czmdiver on Oct 8, 2015 14:20:56 GMT -6
Yes try the #32 pilot and 114 main to much fuel for your stock motor. Just to get an idea my motor is bored out with a stroker to 182ccs and the carb is a 24mm with #38pilot and 122.5. If a motor is stock and you add free flow filter and free flow exhaust you bump up ONLY THE MAIN JET by at least 4 sizes from what is in there. But slapping in a 30mm carb that usually come with the 250s on a basically stock motor that is called over carbing a motor, to much fuel and to much air. If you still cannot tune it right just slap the 24mm back on with a #35 pilot and the 114 main jet and it should run really good. Alleyoop The "Over Carb'd" was the direction I was going. Specially with Stock exhaust. And Stock Exhaust. Oh Boy  This was My Stock Head Pipe, ID Smaller than the Exh. port. Flange not centered and stud holes three times to big, All have the Flashing inside and Look at that Big Ol Goober of Weld in there. I can't even get the dmn thing indexed straight to dump. Allot of FAKE Perf exhaust to empty you wallet, AT least make sure you get a Stainless Head Pipe the same dis. as the ex. port. then any Free Flow fart can will do    Yes its Too LOUD. btwI have stock internals, ya know air ,exh, ign. mod and have a 26mm working Very well. Do I have a Dyno sheet from the 24mm to the 26mm, No |
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Post by Alleyoop on Oct 8, 2015 14:39:29 GMT -6
Do not need a Dyno for a 24 -26 mm you can even go 28 but once you get in the 30s that now requires a larger intake manifold and if the intake does not match up with the motors intake you will have a ridge all around the motors intake as the larger intake does not match the motors intake diameter. So what happens all the air and fuel is disturbed as it is being sucked in and power is lost. Many do not even realize that the Lager intake is much bigger than their motors intake. But be as it may people will do what they do then bitch about how it is running  . |
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Post by czmdiver on Oct 8, 2015 16:56:33 GMT -6
I wasn't go and throw down a bunch of perf. gains without documentation. pic,vid etc. I made three changes at once and found a problem with the Vari, fairly sizable mph gain. True dat the Larger carb manifold is much larger than the Port itself, I know some won't admit to hogging it out to match (while still on the motor) but still dumping a toilet into a straw.  OE stock on right.. dunno if I'm even going t use this stuff, barbaric  OE stock on right again, crude very crude |
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Post by Alleyoop on Oct 8, 2015 17:44:32 GMT -6
I wasn't go and throw down a bunch of perf. gains without documentation. pic,vid etc. I made three changes at once and found a problem with the Vari, fairly sizable mph gain. True dat the Larger carb manifold is much larger than the Port itself, I know some won't admit to hogging it out to match (while still on the motor) but still dumping a toilet into a straw. OE stock on right.. dunno if I'm even going t use this stuff, barbaric OE stock on right again, crude very crude Thank you, for showing what I was talking about. Alleyoop |
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Post by czmdiver on Oct 9, 2015 13:06:10 GMT -6
Here this is a lil more graphic. Second pic is a overlay, ya I know its not lined up perfect but ya get the gist of the difference in Port Size.   |
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Clinician
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Post by ryanosalien on Oct 9, 2015 15:02:25 GMT -6
The exhaust is still stock yes but I did take it off and gutted out some of the internals enough to make it straight through and drimmeled as much as I could at the port to match the motor but even then not really enough I've just seen some scooters with less than what I've got get a 30mm tuned in but I guess I over shot it lol and I can't use 1 of the traditional bbk with a 1p57qmj motor... so down sizing it is
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Post by czmdiver on Oct 9, 2015 15:39:18 GMT -6
The exhaust is still stock yes but I did take it off and gutted out some of the internals enough to make it straight through and drimmeled as much as I could at the port to match the motor but even then not really enough I've just seen some scooters with less than what I've got get a 30mm tuned in but I guess I over shot it lol and I can't use 1 of the traditional bbk with a 1p57qmj motor... so down sizing it is K, cool Thanks for being honest, its the Best way we can help you and Benefit many others.  |
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..BAD TO THE BONE..
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