Post by electrorange on Dec 9, 2013 18:13:36 GMT -5
I have a Aprilia scarabeo with a Minnelli horizontal 50cc engien basically a jog. I just purchased it was not running. after cleaning it out I got it to run. was slow off the line and was slow to get to 35max did a plug chop and it was good. but It was not as peppy as other scooters I've had so I added a expansion exhaust up jetted and a hi Flo filter. but now it starts with choke and after it warms up I remove choke and it revs up the revs down and dies. if I give it gas with out choke and ride it will take off fast and at a third of throttle it will die. what are the posible causes this is happening
Sounds way lean. A pipe and open filter will require pilot and main jet swaps. If its the stock carb you will still have lean spots with that open filter. Unless you have needles as well? Or run it real rich. I would suggest putting the stock airbox back on. If you like the noise from the open filters try pulling the snorkel out of the stock box. They are much easier to tune with the stock airbox and usually make more power.
2003 Kymco Cobra A/C 47mm iron bore Naraku cylinder with Malossi Sport head. Leo Vince SP3 exhaust, 21mm PHBG carb, factory intake modified, factory reedblock with my own.35mm CF reeds, Factory airbox modded, Polini vari with 7.75g Dr.P sliders, OEM and NCY mixed rear pulley, OEM clutch with tighter springs, stock clutch bell, Top Racing final drive gears (noisy SOBs).
NASRA 2013-current 1/8th mile dragrace record holder with an 8.3s pass at over 77MPH on a custom rail built by 190mech
If you reduce air and it runs better that means it needs more fuel. I agree with 2strokd that the stock airbox is a good idea if possible. If not, start with just focusing on WOT and the main jet. Prob something like a 95-100 main jet as a starting point would be my choice. May be too big, but if it is so rich that it sputters you just swap to the next size down and work your way to best results. If it's lean you can damage things easier so it's better to start rich. Once the main jet gives you good power/speed, then move on to the needle and idle mixture. If you aren't sure what's right on the needle position, go as rich as the engine will take without drivability issues. You may decide to adjust it leaner after some riding, but again safer to err toward rich.
Last Edit: Jan 22, 2014 17:37:44 GMT -5 by 90GTVert
Post by electrorange on Jan 22, 2014 20:53:58 GMT -5
I drilled out a jet started at 85 and it stoped bogging with 138 ish so ill do a plug shop. is that un unusual to have such a large jet for a 49cc minarelli/jog stock with a hi flo filter and an expancion exhaust. THANK YOU
Post by electrorange on Jan 23, 2014 19:09:48 GMT -5
asuming it is an air leak if i spray with carb clener what areas should i focus on. i removed the intake and cheked it can the paper gasket be to thin. is it bad idea to use a tiny bit of silicon on top of paper gasket. thanks for all the info
Post by electrorange on Feb 1, 2014 16:44:36 GMT -5
it seems that the air leek is eather the intke or the gaket on the reeds. I replace the paper gasket that fits betwen the reeds and the case with a home cut 0.80mm thick do you think it will give me issues with the gasket. also the intake has built in seal seems to be flush to the hard plastic is that normal THANK YOU.