Weirdness after complete servicing?

rojoracing53 · July 7th, 2013, 02:38 PM

So yesterday I inspected my valves, changed oil, changed coolant, cleaned the air filter and synced the carbs. So when I synced the carbs I used a small remote gas reservoir so I could freely adjust the carbs without the gas tank in the way. The carb sync was damn near perfect to start but I turned the screw a few degs to make it absolutely perfect. During the time I was running the bike on the remote tank the bike was running great with perfect throttle response.

So then I install the tank and all the bodywork and go to start the bike and it doesn't want to start. So I try the choke(I never use the choke) and it doesn't do anything. Then I try giving it 10% throttle while starting and it fires up but barely idles at 500 rmps. I was able to rev it out to 7k by WOT but then it would just stall.

At this point it sound like I have a vacuum leak somewhere so I pull off the left side fairing and inspect all the hoses but find no problems. I try popping the gas cap and starting it but still the same. I close the gas cap and try one last time and suddenly it holds an idle but the throttle response sucks. So I hop on it the ride it a bit a d it seems to rev fine at WOT but stutters at mid throttle while cruising at 6k RPMs, it also hesitates really bad between shifts when you go to give the throttle again.

It seemed to be improving a little with the couple mins I rode it so I decided to ride it a bit more and see if it cleared up. After a couple easy 0-60mph runs it seemed to be fine so I did one hard 0-60 and it did 6.2 just fine with a non racing start. So whatever it was seems to be gone but I'm not sure why.

Maybe air in the fuel system because I removed the carb to gas tank fuel line when I hooked up the remote tank so when I reinstalled the tank it didn't refill the line completely at first.

Any thoughts on this?

Joshorilla · July 7th, 2013, 02:40 PM

Take it to a mechanic who knows what they're doing

Jk jk, firing on one cylinder? Spark Plugs?

Rassie · July 7th, 2013, 03:00 PM

Probably some dirt that got into one of the vacuum lines or the fuel supply..

Asspire · July 7th, 2013, 03:31 PM

do you have stock air box? before i ditched mine, every now and then when I touched the carbs the bike would do the same. I traced it to the wire harness running under the air box and pulling on the cdi, after reseating the wires in the socket and rerouting the wire harness, no more problems.

also another thought, you check the tiny little filter that sits in the carb fuel inlet?

KawiKid860 · July 8th, 2013, 02:13 PM

I'd suggest maybe some water got sucked into the carb or something, but you probably have one of those fancy carb sync tools lol. What do you use for a gas resevoir? I really need something better than a leaky water bottle....

rojoracing53 · July 8th, 2013, 02:19 PM

Quote:

Originally Posted by KawiKid860

I'd suggest maybe some water got sucked into the carb or something, but you probably have one of those fancy carb sync tools lol. What do you use for a gas resevoir? I really need something better than a leaky water bottle....

How about a non leaky water bottle

Rode the bike to work and it ran perfect like any other day. I think I got air into the carb system and it was starving for fuel till I went WOT and suctioned it out.

csmith12 · July 8th, 2013, 03:11 PM

Your garage looks proper now. There are bikes in it.

CC Cowboy · July 8th, 2013, 03:28 PM

Definitely Gremlins!

July 7th, 2013, 02:38 PM	#1
rojoracing53 Fast-Guy wannabe Name: Jason Location: Brentwood, Ca Join Date: Oct 2011 Motorcycle(s): 2009 Ninja250, 2011 RM-Z250, 2004 NSR50, Posts: A lot. MOTM - Jan '13	Weirdness after complete servicing? So yesterday I inspected my valves, changed oil, changed coolant, cleaned the air filter and synced the carbs. So when I synced the carbs I used a small remote gas reservoir so I could freely adjust the carbs without the gas tank in the way. The carb sync was damn near perfect to start but I turned the screw a few degs to make it absolutely perfect. During the time I was running the bike on the remote tank the bike was running great with perfect throttle response. So then I install the tank and all the bodywork and go to start the bike and it doesn't want to start. So I try the choke(I never use the choke) and it doesn't do anything. Then I try giving it 10% throttle while starting and it fires up but barely idles at 500 rmps. I was able to rev it out to 7k by WOT but then it would just stall. At this point it sound like I have a vacuum leak somewhere so I pull off the left side fairing and inspect all the hoses but find no problems. I try popping the gas cap and starting it but still the same. I close the gas cap and try one last time and suddenly it holds an idle but the throttle response sucks. So I hop on it the ride it a bit a d it seems to rev fine at WOT but stutters at mid throttle while cruising at 6k RPMs, it also hesitates really bad between shifts when you go to give the throttle again. It seemed to be improving a little with the couple mins I rode it so I decided to ride it a bit more and see if it cleared up. After a couple easy 0-60mph runs it seemed to be fine so I did one hard 0-60 and it did 6.2 just fine with a non racing start. So whatever it was seems to be gone but I'm not sure why. Maybe air in the fuel system because I removed the carb to gas tank fuel line when I hooked up the remote tank so when I reinstalled the tank it didn't refill the line completely at first. Any thoughts on this?

July 7th, 2013, 03:00 PM	#3
Rassie Motorcycle bon vivant... Name: Rassie Location: Cary, NC Join Date: Jun 2011 Motorcycle(s): 300 Ninja, 250R Ninja, SV650S, CB350, GT750, Aprilia RS250, Triumph Street Triple R Posts: 101	Probably some dirt that got into one of the vacuum lines or the fuel supply.. __________________________________________________ NESBA 13, 300 Ninja, 250r Ninja, 06 SV650, Ninja ex250, CB350, CL90 ,GT750, Aprilia RS250, Triumph Street Triple R www.mybikeproject.com

July 8th, 2013, 03:11 PM	#7
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	Your garage looks proper now. There are bikes in it. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

July 8th, 2013, 03:28 PM	#8
CC Cowboy ninjette.org certified postwhore Name: Whodat Location: Ware Is.,MA Join Date: Jan 2009 Motorcycle(s): I pass the wind! Posts: A lot. MOTM - Mar '13, Jun '14	Definitely Gremlins! __________________________________________________ If everything seems under control; you're just not going fast enough!

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July 7th, 2013, 02:40 PM	#2
Joshorilla Bass Master General Join Date: Aug 2012 Posts: A lot. Blog Entries: 24	Take it to a mechanic who knows what they're doing Jk jk, firing on one cylinder? Spark Plugs?

July 7th, 2013, 03:31 PM	#4
Asspire Fix It Till Ya Break It Name: Asspyre Location: T.Dot Join Date: Oct 2011 Motorcycle(s): 08 250RRrrrr Posts: 623	do you have stock air box? before i ditched mine, every now and then when I touched the carbs the bike would do the same. I traced it to the wire harness running under the air box and pulling on the cdi, after reseating the wires in the socket and rerouting the wire harness, no more problems. also another thought, you check the tiny little filter that sits in the carb fuel inlet?

July 8th, 2013, 02:13 PM	#5
KawiKid860 ninjette.org certified postwhore Name: Murphey Location: Eastern Washington Join Date: Apr 2011 Motorcycle(s): 2002 Honda 919, 2004 Ninja 500R NAKED Posts: A lot.	I'd suggest maybe some water got sucked into the carb or something, but you probably have one of those fancy carb sync tools lol. What do you use for a gas resevoir? I really need something better than a leaky water bottle....