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11-06-2014, 03:12 AM | #31 |
Join Date: Oct 2014
Posts: 28
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Because my spark plug still reads my mixture is still lean, but I "tuned" the carburetor per the above instructions. Do I just need to turn the mixture counterclockwise an 1/8" of a turn, ride around a little bit, and check the plug to see where I'm at?
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11-06-2014, 05:46 AM | #32 |
Join Date: Mar 2013
Location: murphy n.c
Posts: 467
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its always good to start with a new plug but yes to your answer.once you get it in tune use your plugs u used in the past for testing.
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11-06-2014, 05:52 AM | #33 |
Join Date: Mar 2013
Location: murphy n.c
Posts: 467
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a lot of people on here don't use after market filters cause of problems you are having.read about how they put tape on them to make it richer.when you turn your screw you have to wait to see the engine rpms change.i always turn to the left and when rpms go highest I turn to the right same thing and put it in the middle
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11-06-2014, 07:47 AM | #34 |
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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turn the mixture screw CLOCKWISE an additional 1/8 turn, then run it for a few days and "plug chop".
You're looking for a nice brown coffee color on the WHITE CERAMIC INSULATOR directly under the spark points.
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2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats. |
11-06-2014, 07:48 AM | #35 |
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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Turning the MIXTURE SCREW COUNTERCLOCKWISE LEANS the MIXTURE.
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2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats. |
11-06-2014, 01:08 PM | #36 |
Join Date: Oct 2014
Posts: 28
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Gotcha. I'll try and retune my carb... And it could possibly be an issue with too much air either way because of the filter, so if I don't get results by tuning the carb I'll start removing surface area from the air filter.
This is frustrating business for sure! Okay another question, specifically a CVT questions: I'm looking to squeeze another 10 MPH out of this thing (right now it cruises at 40-45). How might I go about doing this? Changing the roller weights? Clutch springs? Using a kevlar belt? I heard the A9 cam increases top speed. Thoughts? Last edited by jjohns2711; 11-06-2014 at 03:58 PM. |
11-07-2014, 04:34 PM | #37 |
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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You're in break-in, do not try to ride faster than 40mph. ESPECIALLY with a Bbk. People argue w me about break in, but trust me I speak from experience, for the first 800 miles, vary your RPMs constantly and evenly. Only hit maximum for LESS than five second at a time.
Then, after break-in, get a KOSO-style variator w 6g flat-sliders and red-spring clutch. A Kevlar belt is a good plan as well.
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2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats. |
11-07-2014, 04:39 PM | #38 |
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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It is possible that you may need to restrict the filter. I use paper cone filters and electrical tape.
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2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats. |
11-08-2014, 06:35 PM | #39 |
Join Date: Oct 2014
Posts: 28
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Noted. I'm trying to vary the RPMs as much as I can, although I still drive it on the daily. So far so good.
I don't have an impact wrench to get the nut off that holds the variator and the clutch on. Any suggestions? |
11-08-2014, 07:09 PM | #40 |
Join Date: Jul 2011
Location: Connecticut
Posts: 493
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Yes go get one of these, and pay the 6 bucks for the no-questions asked replacement plan.
http://www.harborfreight.com/12-in-e...nch-68099.html That's what I use.
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2011 Roketa MC-23-150 4T 150cc 157 qmj 24mm carb w 115 main jet and paper cone air filter Manual petcock w Tygon fuel lines Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust RED spring clutch Adjustable CDI (brand unknown, it's blue and red and works great!) KOSO high performance variator w 12g sliders Gates Powerlink 835-20-30 belt GPS verified 65mph on flats. |
11-11-2014, 03:11 AM | #41 |
Join Date: Oct 2014
Posts: 28
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I'm going to check the plug tomorrow after a WOT run to see where my mixture is.
Current planned CVT upgrades: performance variator with 6.5g roller weights (not sliders, only because I already have the roller weights), kevlar belt, and performance clutch with red-springs. My engine is 139QMA, so it's essentially the same as a QMB, but it fits 12" wheels, so it requires the longer belt. Anyone got a link to a good kevlar belt that'll fit a QMA? |
11-11-2014, 07:47 AM | #42 |
Join Date: Oct 2008
Location: Hyde Park, NY
Posts: 1,130
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2008 Eagle Milano 150- 9,679 miles 2009 Honda Rebel 250- 10,434 miles 2009 CF Moto Fashion- 16,023 miles 2009 MC-114 50cc Cub Clone- 4,317 miles twowheeler.yolasite.com/ That's 30,049 China Scootin miles and Counting. |
11-18-2014, 08:54 PM | #43 |
Join Date: Oct 2014
Posts: 28
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Awesome, thanks for the link.
So I'm just a little confused. I do all these modifications, and my top speed is still 40-45 MPH. Am I missing something? My friend's stock 50cc GY6 scooter s just as fast as mine (although my acceleration is quite better). Is it the gearing? I want it to cruise at 50 MPH comfortably. That's my goal. And I'm not even that big either - 6'2" and 180 lbs. Any ideas? |
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