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Post by eric1021 on Feb 1, 2014 12:51:46 GMT -5
I have a new vip 50cc scooter with 20km. The problem I had is my scooter is alot slower to take off from a light then my daughters scooter, which is the same scoot, just a 2011. So I replaced the carb from scrapydog so I could adjust a/f mixture screw. Installed the carb, scoot still had hesatation from idle to full throttle.
Pulled the plug to see how it was burning at idle, plug was black. Did a plug chop and plug was white. Ordered 80 main jet (had a 75 in it stock) installed the jet, now main jet seems to be good. Idle jet is a 30 and it still seems to be running rich at idle.
Mixing screw about 1 turn out, seems to be the only spot the the hesatation is at its minimum, but still very pronounced. Acceleration is little bit better but still very low, power is so low that I can hold back the scoot from moving with my feet on the ground.
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Post by ramblinman on Feb 1, 2014 13:07:33 GMT -5
if the carb is tuned properly then you'll have to change the variator weights. it's an easy process if you have an impact wrench and even easier if you have a tachometer. if you know your rpm's on take off and you know how heavy your current rollers are then buying replacements is a snap.
for every gram heavier you can expect about 500 less rpm's on take off. so for example if your rpm's are at 5800 on take off with 8 gram weights then going down to 5 gram weights will bring your rpm's up about 1500 to put you in the power band. you want rpm's between 7200-7500 on take off for best acceleration.
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Post by eric1021 on Feb 1, 2014 13:21:36 GMT -5
if the carb is tuned properly then you'll have to change the variator weights. it's an easy process if you have an impact wrench and even easier if you have a tachometer. if you know your rpm's on take off and you know how heavy your current rollers are then buying replacements is a snap. for every gram heavier you can expect about 500 less rpm's on take off. so for example if your rpm's are at 5800 on take off with 8 gram weights then going down to 5 gram weights will bring your rpm's up about 1500 to put you in the power band. you want rpm's between 7200-7500 on take off for best acceleration. The weights are 5g as it is now, I should go lower? |
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Post by ramblinman on Feb 1, 2014 13:34:43 GMT -5
if the carb is tuned properly then you'll have to change the variator weights. it's an easy process if you have an impact wrench and even easier if you have a tachometer. if you know your rpm's on take off and you know how heavy your current rollers are then buying replacements is a snap. for every gram heavier you can expect about 500 less rpm's on take off. so for example if your rpm's are at 5800 on take off with 8 gram weights then going down to 5 gram weights will bring your rpm's up about 1500 to put you in the power band. you want rpm's between 7200-7500 on take off for best acceleration. The weights are 5g as it is now, I should go lower? ok, i just read your other thread. if both are set up the same then i would suspect your torque sheave (driver) is holding you back. i had this problem on a new clutch assembly recently where the pulley was difficult to open. turned out the oil seals were very tight. i replaced them with some used ones and my problem was solved. unless someone else with more experience has better advice i would pull apart your clutch. at the 11m41s mark is the part i was having problems with. the pulley was very difficult to open on mine. i'd watch the whole video if you've never opened your cvt cover. |
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Post by eric1021 on Feb 1, 2014 13:51:20 GMT -5
Im open to anything, ill check that out.
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Post by ramblinman on Feb 1, 2014 14:17:45 GMT -5
Im open to anything, ill check that out. if the engine is tuned... idles fine and revs with no issues then (in my limited experience) i'm close to 100% certain it is the torque driver. |
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Post by eric1021 on Feb 1, 2014 17:31:21 GMT -5
Opened up the cvt and pulled the clutch apart everything is moving freely. Cleaned everything up and filled the slots with the pins with grease. Question, could my daughters scooter have a big bore kit installed without any other mods to it? How can I tell? I replaced the carb on her scooter with the stock carb with stock jets.
No after market exhaust ot anything on hers.
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Post by alleyoop on Feb 1, 2014 17:43:23 GMT -5
How does it run on the center stand do the RPMS go high or does it still struggle to build up rpms?
If it revs nice and high on the center stand then it is probably low on power check the compression on the motor.
Alleyoop
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Post by alleyoop on Feb 1, 2014 17:53:42 GMT -5
It could also just be the Fuel Ratio Mixture needs to be adjusted. Here is how to adjust your carbs fuel ratio mixture. From what you say it is low on power starting off then it is ok, so it could be to rich or to lean off IDLE.
From where the fuel ratio is currently at , start the motor and let it warm up at least 5 minutes so the enricher cuts off the extra fuel THEN:
The Idea here is to GET the HIGHEST idle from the mixture.
So First try turning the fuel screw 1/4 COUNTER CLOCKWISE richer and Listen for the idle IF it goes up repeat 1/4 at a time and wait 10 or so seconds between each 1/4 turn to allow the motor to catch up with the new setting.
If on the LAST 1/4 turn the IDLE does nothing or drops a little TURN the Screw CLOCKWISE 1/8 and that should be pretty good.(GIVE IT A TRY) at the point.
IF on the first turn COUNTER CLOCKWISE the idle does nothing or drops THEN do the ABOVE but CLOCKWISE leaning it out. Same procedure but the OPPOSITE. REMEMBER YOU WANT the HIGHEST IDLE after your adjustment.
Alleyoop
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Post by ramblinman on Feb 1, 2014 17:58:08 GMT -5
Opened up the cvt and pulled the clutch apart everything is moving freely. Cleaned everything up and filled the slots with the pins with grease. bummer... was convinced that was holding your scoot back. Alleyoop has chimed in and he can certainly help you better than I. |
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Post by eric1021 on Feb 1, 2014 18:25:33 GMT -5
I tried to adjust the carb in the manner you discibed, 1 turn out from the stop is where it likes it the best. My scoot runs fine, idles great rev good on center stand. I will try to geta video up on the engine hesitation and a ccomparison between my scoot and my daughters tomorrow.
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Post by pauldog on Feb 1, 2014 20:32:11 GMT -5
Try taking out the air restrictor on the intake to your air box. If you get more hesitation you r getting to much air. At which time put it back in and tape off 2 of the holes. See what happens.
Also at 20km you r not even close to it being broken in. Your engine is the tightest it is ever gonna be.
Most engines run lean in cold dry air. You will see a big difference from 80 and sunny to 32 cold and dry air.
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Post by alleyoop on Feb 2, 2014 1:44:50 GMT -5
I tried to adjust the carb in the manner you discibed, 1 turn out from the stop is where it likes it the best. My scoot runs fine, idles great rev good on center stand. I will try to geta video up on the engine hesitation and a ccomparison between my scoot and my daughters tomorrow. One turn out from the closed position it runs the best! Will it stay running if you close it all the way? Also what are the temps where you live? Alleyoop |
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Post by eric1021 on Feb 2, 2014 11:37:08 GMT -5
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Post by millsc on Feb 2, 2014 11:42:36 GMT -5
Your daughters scooter may have a bigger motor several Tao Tao scooters 2011 models have a 44mm pistons 63cc
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..BAD TO THE BONE..
