Bike bogging when giving it throttle

dwright0723 · July 1st, 2013, 10:40 PM

My bike runs like crap when giving it throttle. When you try to give it throttle, the engine seems to bog down and struggle. From this point, if you give it more gas, it stalls. Holding it at that same amount of throttle will sometimes eventually stall it. You can't really get up in the rpms at all. With the choke fully on, it climbs up through the rpms. It doesn't rev, but it slowly climbs up.

I've changed the plugs, ran it without the air filter, and tried Seafoam, all with the same problem. I upped the idle which seemed to help, but it's still not fixed (when I raised the idle and cranked the throttle, the rpms seemed to hang a bit, but maybe I used too much Seafoam? Doesn't seafoam lean it out?). I drained all of the fuel and pulled the carbs, and they actually looked really clean. I put it back together and put a little bit of fuel in it and had the same issue. I turned it off and when I opened the gas cap, the bike make a hissing noise like it was either releasing pressure or sucking in air. I closed it back and retried it and the bike seemed much better. Not 100%, but way better than before. I tried it again the next day, and got the same thing. Ran like crap with throttle, opened cap, hissed, then ran much better.. Could this be a fuel tank venting or gas cap issue?

DaBlue1 · July 2nd, 2013, 06:25 AM

Quote:

Originally Posted by dwright0723

.... I turned it off and when I opened the gas cap, the bike make a hissing noise like it was either releasing pressure or sucking in air. I closed it back and retried it and the bike seemed much better. Not 100%, but way better than before. I tried it again the next day, and got the same thing. Ran like crap with throttle, opened cap, hissed, then ran much better.. Could this be a fuel tank venting or gas cap issue?

Does your bike's gas vent make noise on a regular basis? It should. An improperly vented fuel tank can cause fuel flow problems. You may also want to check the stock inline filter to make sure it's not clogged as well. If your air filter is stock, you may want to change it as well. Kawasaki recommends replacement @ 2 years. Also make sure it is not over oiled and that you have nothing obstructing the snorkel or airbox.

areifel · July 2nd, 2013, 06:28 AM

I have the same issues during summer. What i do is i open and close the gas cap every time before i start the bike up. Been working for the past year or so.

csmith12 · July 2nd, 2013, 06:46 AM

Sounds like you have some sort of fuel (not getting enough) or vac issue.

I need to get up there to help you out. Been racing the past 2 weekends and will be racing again in two weeks.

Lemme check my schedule with your pm and let you know.

dwright0723 · July 2nd, 2013, 07:09 AM

Quote:

Originally Posted by DaBlue1

Does your bike's gas vent make noise on a regular basis? It should. An improperly vented fuel tank can cause fuel flow problems. You may also want to check the stock inline filter to make sure it's not clogged as well. If your air filter is stock, you may want to change it as well. Kawasaki recommends replacement @ 2 years. Also make sure it is not over oiled and that you have nothing obstructing the snorkel or airbox.

Haven't really been far on it, but I've yet to hear noise beyond opening the gas cap.. Inline filter was clean.. I pulled the air filter out with the same results.. I guess that would make it run leaner though..

Quote:

Originally Posted by csmith12

Sounds like you have some sort of fuel (not getting enough) or vac issue.

I need to get up there to help you out. Been racing the past 2 weekends and will be racing again in two weeks.

Lemme check my schedule with your pm and let you know.

Ok.. I know I'm off Thursday and Friday.. not sure about nxt week. They don't post out schedule till Fridays.. should be able to.request days off thought..

csmith12 · July 2nd, 2013, 07:12 AM

Let's shoot for Friday.

Motofool · July 2nd, 2013, 07:30 AM

Quote:

Originally Posted by dwright0723

........... Could this be a fuel tank venting or gas cap issue?

Expert help is on his way !!! .............Kudos to Chris

In the meantime, keeping the cap closed, pull the gas hose out of the carbs' connector and measure how much fuel if flowing down.

At any time you should have at least 2 cc per second.

If you do, then you will need to verify that the float valves are open, by draining the bowls.

If the problem persists, then, you need to verify the operation of the diaphragms and needles.

csmith12 · July 2nd, 2013, 07:33 AM

Thanks but I think expert is a pretty strong word. lol

Motofool · July 2nd, 2013, 07:44 AM

Quote:

Originally Posted by csmith12

Thanks but I think expert is a pretty strong word. lol

If you are not an expert, who is?

dwright0723 · July 2nd, 2013, 02:43 PM

Quote:

Originally Posted by csmith12

Let's shoot for Friday.

Alright! Sounds like a plan! Here's some vids I made earlier: https://www.youtube.com/watch?v=GhHB...e_gdata_player

https://www.youtube.com/watch?v=vx6t...e_gdata_player

Those were earlier.. I let it run for a while and eventually I heard a long beeping sound coming from the tank... Seemed better after that.

DaBlue1 · July 2nd, 2013, 02:51 PM

Do you use the choke and let the bike warm up before cranking on the throttle?
Has the bike been sitting out in the rain a while?
Also your gas cap looks like crap. Cleaning that up may help with your venting, there's a couple of little holes around the lock that vent the air.

csmith12 · July 2nd, 2013, 03:12 PM

Whoa! Definitely NOT venting. Clean that as much as possible.

What time on Friday? And pm me your addy please.

xaple · July 2nd, 2013, 03:28 PM

You said you pulled the carbs, did you clean them out and drain the bowls? Seafoam may not have done the job. I had this exact problem.

dwright0723 · July 2nd, 2013, 04:57 PM

Quote:

Originally Posted by DaBlue1

Do you use the choke and let the bike warm up before cranking on the throttle?
Has the bike been sitting out in the rain a while?
Also your gas cap looks like crap. Cleaning that up may help with your venting, there's a couple of little holes around the lock that vent the air.

Yeah, I let it run for a while with the choke on, then let it run with it off for a bit before these vids. Not sure about rain. I got it 3 weeks ago and its been in the garage. Not sure about the previous owner.

Quote:

Originally Posted by csmith12

Whoa! Definitely NOT venting. Clean that as much as possible.

What time on Friday? And pm me your addy please.

What's good to clean it with? Carb/brake cleaner? I'm off Friday so really whenever is convenient for you! I'll get ya my address...

Quote:

Originally Posted by xaple

You said you pulled the carbs, did you clean them out and drain the bowls? Seafoam may not have done the job. I had this exact problem.

I drained the bowls and shot some carb cleaner through the visable holes.. looked really clean... I.didn't go.beyond the.bowls though!

csmith12 · July 2nd, 2013, 05:05 PM

Quote:

Originally Posted by dwright0723

What's good to clean it with? Carb/brake cleaner? I'm off Friday so really whenever is convenient for you! I'll get ya my address...

I drained the bowls and shot some carb cleaner through the visable holes.. looked really clean... I.didn't go.beyond the.bowls though!

Carb cleaner for the tough stuff on the gas cap, careful of the paint though. Spray into the rag and then wipe.

Pull the carbs and have them out for when I get there. We will clean them (jets and all) and put em back in. I will bring the guitar string if you have the carb cleaner ready.

dwright0723 · July 2nd, 2013, 11:10 PM

Quote:

Originally Posted by csmith12

Carb cleaner for the tough stuff on the gas cap, careful of the paint though. Spray into the rag and then wipe.

Pull the carbs and have them out for when I get there. We will clean them (jets and all) and put em back in. I will bring the guitar string if you have the carb cleaner ready.

okie dokie...

csmith12 · July 5th, 2013, 04:30 PM

Nice meeting you today Darryl. Let me know how everything goes.

Motofool · July 5th, 2013, 04:56 PM

Quote:

Originally Posted by csmith12

Nice meeting you today Darryl. Let me know how everything goes.

Fixed her up?

csmith12 · July 5th, 2013, 05:00 PM

Yep she runs just fine. Needs a new air filter and to bleed the rear brake but after that it's ready to go.

Motofool · July 5th, 2013, 05:18 PM

Quote:

Originally Posted by csmith12

Yep she runs just fine. Needs a new air filter and to bleed the rear brake but after that it's ready to go.

dwright0723 · July 5th, 2013, 05:23 PM

Quote:

Originally Posted by csmith12

Nice meeting you today Darryl. Let me know how everything goes.

Nice meeting you too bud! Thanks a lot! I really appreciate it!

csmith12 · July 5th, 2013, 06:07 PM

For completeness and to bring closer to the problem in the OP;

Visual check of all vac lines
We cleaned the carbs
Drilled caps off mix screws, one was 1 turn out, the other was 2 1/4 turns out. WTF!

Never seen that from the factory. Set both to 2 1/4 turns
I pulled some goo out of one of the gas cap vent holes, ensured they both were clear

While I was in the areas, I also checked;
Rear and front brake pads and calipers
Controls and cables
Shift lever and linkage
Tires
Engine mount bolts
Stem bolt
Clip on's - one was loose

Various other little things that are to much to list
General wiring looked to be in good working order
I also adjusted his rear shock to position 3.

Overall the bike was clean, just a victim of to much dormant time in a garage from the previous owner. With a little bit more TLC, it will make a fine riding bike.

dwright0723 · July 5th, 2013, 06:35 PM

Quote:

Originally Posted by csmith12

Yep she runs just fine. Needs a new air filter and to bleed the rear brake but after that it's ready to go.

Runs muchhh better... Even sounds better! Chris is the man!

Alex · July 15th, 2013, 10:11 PM

July 1st, 2013, 10:40 PM	#1
dwright0723 ninjette.org member Name: Darryl Location: OSU/Dayton, OH Join Date: May 2013 Motorcycle(s): 08 Ninja 250 Posts: 121	Bike bogging when giving it throttle My bike runs like crap when giving it throttle. When you try to give it throttle, the engine seems to bog down and struggle. From this point, if you give it more gas, it stalls. Holding it at that same amount of throttle will sometimes eventually stall it. You can't really get up in the rpms at all. With the choke fully on, it climbs up through the rpms. It doesn't rev, but it slowly climbs up. I've changed the plugs, ran it without the air filter, and tried Seafoam, all with the same problem. I upped the idle which seemed to help, but it's still not fixed (when I raised the idle and cranked the throttle, the rpms seemed to hang a bit, but maybe I used too much Seafoam? Doesn't seafoam lean it out?). I drained all of the fuel and pulled the carbs, and they actually looked really clean. I put it back together and put a little bit of fuel in it and had the same issue. I turned it off and when I opened the gas cap, the bike make a hissing noise like it was either releasing pressure or sucking in air. I closed it back and retried it and the bike seemed much better. Not 100%, but way better than before. I tried it again the next day, and got the same thing. Ran like crap with throttle, opened cap, hissed, then ran much better.. Could this be a fuel tank venting or gas cap issue?

July 2nd, 2013, 06:46 AM	#4
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	Sounds like you have some sort of fuel (not getting enough) or vac issue. I need to get up there to help you out. Been racing the past 2 weekends and will be racing again in two weeks. Lemme check my schedule with your pm and let you know. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School
	1 out of 1 members found this post helpful.

July 2nd, 2013, 07:12 AM	#6
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	Let's shoot for Friday. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

July 2nd, 2013, 07:33 AM	#8
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	Thanks but I think expert is a pretty strong word. lol __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

July 2nd, 2013, 03:12 PM	#12
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	Whoa! Definitely NOT venting. Clean that as much as possible. What time on Friday? And pm me your addy please. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

July 2nd, 2013, 06:28 AM	#3
areifel ninjette.org member Name: Drew Location: Florida Join Date: Nov 2010 Motorcycle(s): 2009 Ninja 250R Posts: 194	I have the same issues during summer. What i do is i open and close the gas cap every time before i start the bike up. Been working for the past year or so.

July 2nd, 2013, 02:51 PM	#11
DaBlue1 Long Time Rider Name: Blue Location: Charlotte, NC Join Date: Sep 2010 Motorcycle(s): 2009 Kawasaki Ninja 250R Posts: A lot.	Do you use the choke and let the bike warm up before cranking on the throttle? Has the bike been sitting out in the rain a while? Also your gas cap looks like crap. Cleaning that up may help with your venting, there's a couple of little holes around the lock that vent the air.

July 2nd, 2013, 03:28 PM	#13
xaple ninjette.org guru Name: Daniel "God" Location: South Florida Join Date: Aug 2012 Motorcycle(s): Ninja 250 Posts: 326	You said you pulled the carbs, did you clean them out and drain the bowls? Seafoam may not have done the job. I had this exact problem.

July 5th, 2013, 04:30 PM	#17
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	Nice meeting you today Darryl. Let me know how everything goes. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

July 5th, 2013, 05:00 PM	#19
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	Yep she runs just fine. Needs a new air filter and to bleed the rear brake but after that it's ready to go. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

July 5th, 2013, 06:07 PM	#22
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	For completeness and to bring closer to the problem in the OP; Visual check of all vac lines We cleaned the carbs Drilled caps off mix screws, one was 1 turn out, the other was 2 1/4 turns out. WTF! Never seen that from the factory. Set both to 2 1/4 turns I pulled some goo out of one of the gas cap vent holes, ensured they both were clear While I was in the areas, I also checked; Rear and front brake pads and calipers Controls and cables Shift lever and linkage Tires Engine mount bolts Stem bolt Clip on's - one was loose Various other little things that are to much to list General wiring looked to be in good working order I also adjusted his rear shock to position 3. Overall the bike was clean, just a victim of to much dormant time in a garage from the previous owner. With a little bit more TLC, it will make a fine riding bike. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School
	1 out of 1 members found this post helpful.

July 15th, 2013, 10:11 PM	#24
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	__________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

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