Planet Minis

Eldubya · 02-25-2008, 09:18 PM

well here is my question, I've installed a lifan 90cc in my 77 Z50, with a 20mm carb kit and a minigunz exhaust. Now it fires up and idles well but as soon as you hit on the throttle it bogs down and practically dies. I assume its a jetting problem, although maybe could it be the air/fuel mixture screw as I havn't fiddled with that yet either. Anyways any help would be greatly appreciated.
thanks Layne

patman · 02-26-2008, 08:13 PM

How does the spark plug look?Black = rich,white = lean.

SLAyER · 02-26-2008, 08:24 PM

Yes you are probably right thinking its the fuel/air mixture screw. Try going a half turn in either direction until it starts to clear up. That screw is 0 - 1/4 throttle and greatly effects just off throttle response. It could be the pilot as well, but usually if its easy to start and idles fine its usually just the fuel/air screw.

02-25-2008, 09:18 PM	#1 (permalink)
Eldubya PM Newbie Join Date: Oct 2006 Posts: 27	Jetting question (20mm carb) well here is my question, I've installed a lifan 90cc in my 77 Z50, with a 20mm carb kit and a minigunz exhaust. Now it fires up and idles well but as soon as you hit on the throttle it bogs down and practically dies. I assume its a jetting problem, although maybe could it be the air/fuel mixture screw as I havn't fiddled with that yet either. Anyways any help would be greatly appreciated. thanks Layne

02-26-2008, 08:13 PM	#2 (permalink)
patman 3rd Gear Member Join Date: Aug 2006 Location: Minnesota Posts: 2,211	Re: Jetting question (20mm carb) How does the spark plug look?Black = rich,white = lean.

02-26-2008, 08:24 PM	#3 (permalink)
SLAyER 2nd Gear Member Join Date: Apr 2004 Location: Camarillo, CA Posts: 984 My Mood:	Re: Jetting question (20mm carb) Yes you are probably right thinking its the fuel/air mixture screw. Try going a half turn in either direction until it starts to clear up. That screw is 0 - 1/4 throttle and greatly effects just off throttle response. It could be the pilot as well, but usually if its easy to start and idles fine its usually just the fuel/air screw.

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