1990 ninja 250 no start/keep running

mechanic22 · 05-09-2005

hey all, new to the forum, I am an automotive mechanic so I am familiar with terms and parts, anyway here is my problem. I just got the bike, its 1990 ninja 250r and I needed a gas tank and the carb holder boots. Just got them in hooked up the gravity/vacuum feed to the fuel valve and everything, When I crank it the carb overflows. If I plug the overflow with my finger it will start, but then it stalls and sputters. Any help would be appreciated

zx10tod · 05-09-2005

Both carbs? Sounds like a stuck float. Dumb question... it is the overflow and not the drain right?

mechanic22 · 05-09-2005

yes the overflow, well i am taking the carb to some one so will see

mechanic22 · 05-09-2005

aight dumb question. I have taking apart the carb with my friend, it turns out the carb was leaking gas at the float gaskets. Anyway, I started cranking again, and the fuel has stopped ooozing out the carb! And the motor is finally seeing fuel and trying to start. Now this is all the hoses I have via the fuel system. I have one lead from the tank, and as I was told its a vent. So I ran the huge hose from the tank to the front of the bike, and is open for the vent. A vacuum line from carb to the fuel valve and one from the fuel valve to the carb. Now heres is the question. as the bike was cranking, I saw smoke (exhaust) coming from right below the carb on the motor/transaxle housing. is that supposed to be like that? wow I am so new to bikes! sorry this is sooo long

QKENUF4U · 05-10-2005

ok.
first question - you kinda figured it out. make sure the screws are TIGHT
second question - are you sure its coming from the exhaust ? could it be your starter getting hot or a wire getting hot ? could be its just coming thru the joint where the front half of the exhaust plugs into the rear half.

mechanic22 · 05-10-2005

qken i privatre messaged you more info

mechanic22 · 05-11-2005

okie so thwere are 2 hose leads on the airbox that are unconnected. there was a hose on the bottom of the airbox that was plugged. I unplugged the hose and fuel came out. So I am having a huge problem here

mechanic22 · 05-11-2005

any one?
bump

mechanic22 · 05-13-2005

bottom line guys. I am not a moron, I know that motors dont need an evap system to run, however if there is an open vacuum line, it could mess up the idleor cause a no start depending on vaccuuum. so I have fuel, I have spark. I can start it with starting fluid, but can not get it to idle. so its either fuel amount or huge vacuum leak, the carb is sealed, cleaned non sticky floats. what else u guys got? n e help appreciated

QKENUF4U · 05-13-2005

i told ya that hole is for CRANKCASE VENTALATION. it runs to the airbox.
in your case if you can get it to run on carb cleaner and not on the carbs then its a fuel delivery problem. i would say its prob. the pilot jets are clogged or you have some vent lines plugged that shouldnt be, might also be the needle is too low or the floats are too low.

05-09-2005	#1 (permalink)
mechanic22 Newbie Join Date: May 2005 Posts: 8	1990 ninja 250 no start/keep running hey all, new to the forum, I am an automotive mechanic so I am familiar with terms and parts, anyway here is my problem. I just got the bike, its 1990 ninja 250r and I needed a gas tank and the carb holder boots. Just got them in hooked up the gravity/vacuum feed to the fuel valve and everything, When I crank it the carb overflows. If I plug the overflow with my finger it will start, but then it stalls and sputters. Any help would be appreciated

05-09-2005	#2 (permalink)
zx10tod Sit speling cheker BTK Expert Join Date: Mar 2005 Location: Idaho Posts: 435	Both carbs? Sounds like a stuck float. Dumb question... it is the overflow and not the drain right? __________________ 1988 ZX10, Vance & Hines SS2R exhaust, stage 3 jet kit, K&N filters. Like I needed another project!

05-09-2005	#3 (permalink)
mechanic22 Newbie Join Date: May 2005 Posts: 8	yes the overflow, well i am taking the carb to some one so will see

05-09-2005	#4 (permalink)
mechanic22 Newbie Join Date: May 2005 Posts: 8	aight dumb question. I have taking apart the carb with my friend, it turns out the carb was leaking gas at the float gaskets. Anyway, I started cranking again, and the fuel has stopped ooozing out the carb! And the motor is finally seeing fuel and trying to start. Now this is all the hoses I have via the fuel system. I have one lead from the tank, and as I was told its a vent. So I ran the huge hose from the tank to the front of the bike, and is open for the vent. A vacuum line from carb to the fuel valve and one from the fuel valve to the carb. Now heres is the question. as the bike was cranking, I saw smoke (exhaust) coming from right below the carb on the motor/transaxle housing. is that supposed to be like that? wow I am so new to bikes! sorry this is sooo long

05-10-2005	#5 (permalink)
QKENUF4U AZ's Official Mechanic BTK Expert Join Date: Sep 2004 Location: phoenix arizona Posts: 3,650	ok. first question - you kinda figured it out. make sure the screws are TIGHT second question - are you sure its coming from the exhaust ? could it be your starter getting hot or a wire getting hot ? could be its just coming thru the joint where the front half of the exhaust plugs into the rear half.

05-10-2005	#6 (permalink)
mechanic22 Newbie Join Date: May 2005 Posts: 8	qken i privatre messaged you more info

05-11-2005	#7 (permalink)
mechanic22 Newbie Join Date: May 2005 Posts: 8	okie so thwere are 2 hose leads on the airbox that are unconnected. there was a hose on the bottom of the airbox that was plugged. I unplugged the hose and fuel came out. So I am having a huge problem here

05-11-2005	#8 (permalink)
mechanic22 Newbie Join Date: May 2005 Posts: 8	any one? bump

05-13-2005	#9 (permalink)
mechanic22 Newbie Join Date: May 2005 Posts: 8	bottom line guys. I am not a moron, I know that motors dont need an evap system to run, however if there is an open vacuum line, it could mess up the idleor cause a no start depending on vaccuuum. so I have fuel, I have spark. I can start it with starting fluid, but can not get it to idle. so its either fuel amount or huge vacuum leak, the carb is sealed, cleaned non sticky floats. what else u guys got? n e help appreciated

05-13-2005	#10 (permalink)
QKENUF4U AZ's Official Mechanic BTK Expert Join Date: Sep 2004 Location: phoenix arizona Posts: 3,650	i told ya that hole is for CRANKCASE VENTALATION. it runs to the airbox. in your case if you can get it to run on carb cleaner and not on the carbs then its a fuel delivery problem. i would say its prob. the pilot jets are clogged or you have some vent lines plugged that shouldnt be, might also be the needle is too low or the floats are too low.

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