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03-07-2015, 02:55 AM
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#1 |
 
Join Date: Jul 2013
Posts: 87
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Piaggio sfera 50 boging at take off
Hy, im fixing my Piaggio sfera 50 2 stroke scooter that i bought. (Sfera has the same engine and frame as Piaggio Zip, only that Sfera has air cooled engine).
I putted in 3 x 8g rollers, so 4g. There were some holes drilled in exhaust so i welded them and I also removed the blind pipe (restriction). And i also cleaned exhaust by pouring gasoline in it and burning it out. There is 17mm BGM carb with manual choke and mallosi MHR air filter on scoot. I dont remember what jet is in, but i think its 55. Scooter was first bogging alot, than i insterted a piece of water hose in filter. Now i got to this state. I tried to put some tape over filter but it was even slightly worser. Now it bogs to 10 - 15km/h but after that speed it goes like crazy. What is the problem? And also after i fix that, is it worth to put 2000RPM springs in the clutch? Thank you |
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03-07-2015, 07:49 AM
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#3 |
 Join Date: Feb 2015
Posts: 257
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Two stroke engines, other than lawn equipment, are something I don't have a lot of experience with yet. However, when you are trying to return something to stock or to improve its performance, the best way is to do one thing and test it. Then either accept the change or modify it to continue in that direction until it starts going worse from the last change. Then proceed to the next thing. Not try to do it all at once.
On the rollers you need 6 total, do you only have 3 now? Holes in the exhaust being welded, increase restriction, removing welded restriction opens it up. Burning out the exhaust MAY cleaned the more liquid portion, but now you have soot- how are you dealing with that? |
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03-08-2015, 03:17 AM
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#4 |
 
Join Date: Oct 2008
Location: Hyde Park, NY
Posts: 1,058
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Bogging is almost always an air leak somewhere. Check for cracked manifold or a leaking vacuum line somewhere. Did you remove the airbox and replace it with some other filter? You may need to up the size of your main jet or adjust the idle mixture screw.
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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. |
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03-09-2015, 02:41 AM
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#5 |
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Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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If your main jet is a 55, that's WAY too small! If it's a 50cc, should be somewhere around an 80 or 82, 84-90 if 70cc.
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 2005 Yamaha BWS (Zuma) "Garfield" TP Black Trophy 70cc, Giannelli Reverse Pipe, 5g Dr. Pulley Sliders, Delta Clutch with Yellow Springs and Yellow Contra, Malossi Torque Controller, Naraku R-Vent Bell, NCY Adjustable Secondary Sliding Sheave, CF Reeds, Kege Analog Tach, Dual Headlight Mod, N.A. Rear Fender Delete, OEM Short Windshield. |
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03-09-2015, 02:42 AM
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#6 |
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Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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Also yes, put the stock airbox back if you have it. The minarelli engines work best with the oem airbox.
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2005 Yamaha BWS (Zuma) "Garfield" TP Black Trophy 70cc, Giannelli Reverse Pipe, 5g Dr. Pulley Sliders, Delta Clutch with Yellow Springs and Yellow Contra, Malossi Torque Controller, Naraku R-Vent Bell, NCY Adjustable Secondary Sliding Sheave, CF Reeds, Kege Analog Tach, Dual Headlight Mod, N.A. Rear Fender Delete, OEM Short Windshield. |
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03-16-2015, 02:31 AM
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#7 |
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Join Date: Jul 2013
Posts: 87
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I removed piece of water hose that i fitted in air filter and it stopped bogging at startup, but then it had bad acceleration and top speed. Strange thing is that i fitted this piece of hose back in and its stil the same. Now take off is good but acceleration and top speed are slow :S
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Linear Mode
