Engine Occassionally Misses - 2007
#1
05-08-2008, 03:19 AM
Engine Occassionally Misses - 2007
Hello:
My 2007 usually runs great. However, occassionally it will develop an increasing tendency to miss while running at higher speeds (50 - 60 mph). At first the missing is so slight you hardly notice it. Then I'll get a 1/10 second miss that I feel. After a few minutes where several of those occur there might several of a second or so, enough so that I lean foward from deceleration. At that point if I slow for a stop light, the bike might stall when it slows to an idle. Starts up again OK. By the time I'm to this point I'm usually home from work and the bike sits overnight and could run fine the next morning. However, on two occasions the problem developed further to what the bike would stall completely causing me to pull over. Usually started again OK after sitting for a few minutes, but one time I couldn't get it to run unless I left the choke out.
No engine nor airbox mods. Running a larger rear sprocket (+1 tooth), 14 tooth front sprocket. 3,000 miles. Oil changed every 1,000, valves adjusted at 800 mi. After the first time it completely stalled, I found the frame mount electrical ground connection was loose. Tightened that and thought the problem had gone away until yesterday when it missed again. Perhaps related to hot days, but not sure.
Any suggestions?
Thanks,
Howard
My 2007 usually runs great. However, occassionally it will develop an increasing tendency to miss while running at higher speeds (50 - 60 mph). At first the missing is so slight you hardly notice it. Then I'll get a 1/10 second miss that I feel. After a few minutes where several of those occur there might several of a second or so, enough so that I lean foward from deceleration. At that point if I slow for a stop light, the bike might stall when it slows to an idle. Starts up again OK. By the time I'm to this point I'm usually home from work and the bike sits overnight and could run fine the next morning. However, on two occasions the problem developed further to what the bike would stall completely causing me to pull over. Usually started again OK after sitting for a few minutes, but one time I couldn't get it to run unless I left the choke out.
No engine nor airbox mods. Running a larger rear sprocket (+1 tooth), 14 tooth front sprocket. 3,000 miles. Oil changed every 1,000, valves adjusted at 800 mi. After the first time it completely stalled, I found the frame mount electrical ground connection was loose. Tightened that and thought the problem had gone away until yesterday when it missed again. Perhaps related to hot days, but not sure.
Any suggestions?
Thanks,
Howard
#3
05-08-2008, 01:02 PM
RE: Engine Occassionally Misses - 2007
ORIGINAL: Howard70
Hello:
My 2007 usually runs great. However, occassionally it will develop an increasing tendency to miss while running at higher speeds (50 - 60 mph). At first the missing is so slight you hardly notice it. Then I'll get a 1/10 second miss that I feel. After a few minutes where several of those occur there might several of a second or so, enough so that I lean foward from deceleration. At that point if I slow for a stop light, the bike might stall when it slows to an idle. Starts up again OK. By the time I'm to this point I'm usually home from work and the bike sits overnight and could run fine the next morning. However, on two occasions the problem developed further to what the bike would stall completely causing me to pull over. Usually started again OK after sitting for a few minutes, but one time I couldn't get it to run unless I left the choke out.
No engine nor airbox mods. Running a larger rear sprocket (+1 tooth), 14 tooth front sprocket. 3,000 miles. Oil changed every 1,000, valves adjusted at 800 mi. After the first time it completely stalled, I found the frame mount electrical ground connection was loose. Tightened that and thought the problem had gone away until yesterday when it missed again. Perhaps related to hot days, but not sure.
Any suggestions?
Thanks,
Howard
Hello:
My 2007 usually runs great. However, occassionally it will develop an increasing tendency to miss while running at higher speeds (50 - 60 mph). At first the missing is so slight you hardly notice it. Then I'll get a 1/10 second miss that I feel. After a few minutes where several of those occur there might several of a second or so, enough so that I lean foward from deceleration. At that point if I slow for a stop light, the bike might stall when it slows to an idle. Starts up again OK. By the time I'm to this point I'm usually home from work and the bike sits overnight and could run fine the next morning. However, on two occasions the problem developed further to what the bike would stall completely causing me to pull over. Usually started again OK after sitting for a few minutes, but one time I couldn't get it to run unless I left the choke out.
No engine nor airbox mods. Running a larger rear sprocket (+1 tooth), 14 tooth front sprocket. 3,000 miles. Oil changed every 1,000, valves adjusted at 800 mi. After the first time it completely stalled, I found the frame mount electrical ground connection was loose. Tightened that and thought the problem had gone away until yesterday when it missed again. Perhaps related to hot days, but not sure.
Any suggestions?
Thanks,
Howard
#4
05-08-2008, 01:15 PM
RE: Engine Occassionally Misses - 2007
Then I'll get a 1/10 second miss that I feel.
#5
05-08-2008, 01:36 PM
RE: Engine Occassionally Misses - 2007
i've had it stall after running it for about 20 min at 7.5-8k rpms (highway) then getting off the exit it just kinda sputtered and stalled when i came to a stop.. has happened twice so far. starts right up after. Havnt really looked into it, just thought it was gettin kinda worked on the highway and that was its way of telling me to chill out. ha ha
#6
05-08-2008, 01:53 PM
RE: Engine Occassionally Misses - 2007
ORIGINAL: Howard70
Hello:
My 2007 usually runs great. However, occassionally it will develop an increasing tendency to miss while running at higher speeds (50 - 60 mph). At first the missing is so slight you hardly notice it. Then I'll get a 1/10 second miss that I feel. After a few minutes where several of those occur there might several of a second or so, enough so that I lean foward from deceleration. At that point if I slow for a stop light, the bike might stall when it slows to an idle. Starts up again OK. By the time I'm to this point I'm usually home from work and the bike sits overnight and could run fine the next morning. However, on two occasions the problem developed further to what the bike would stall completely causing me to pull over. Usually started again OK after sitting for a few minutes, but one time I couldn't get it to run unless I left the choke out.
No engine nor airbox mods. Running a larger rear sprocket (+1 tooth), 14 tooth front sprocket. 3,000 miles. Oil changed every 1,000, valves adjusted at 800 mi. After the first time it completely stalled, I found the frame mount electrical ground connection was loose. Tightened that and thought the problem had gone away until yesterday when it missed again. Perhaps related to hot days, but not sure.
Any suggestions?
Thanks,
Howard
Hello:
My 2007 usually runs great. However, occassionally it will develop an increasing tendency to miss while running at higher speeds (50 - 60 mph). At first the missing is so slight you hardly notice it. Then I'll get a 1/10 second miss that I feel. After a few minutes where several of those occur there might several of a second or so, enough so that I lean foward from deceleration. At that point if I slow for a stop light, the bike might stall when it slows to an idle. Starts up again OK. By the time I'm to this point I'm usually home from work and the bike sits overnight and could run fine the next morning. However, on two occasions the problem developed further to what the bike would stall completely causing me to pull over. Usually started again OK after sitting for a few minutes, but one time I couldn't get it to run unless I left the choke out.
No engine nor airbox mods. Running a larger rear sprocket (+1 tooth), 14 tooth front sprocket. 3,000 miles. Oil changed every 1,000, valves adjusted at 800 mi. After the first time it completely stalled, I found the frame mount electrical ground connection was loose. Tightened that and thought the problem had gone away until yesterday when it missed again. Perhaps related to hot days, but not sure.
Any suggestions?
Thanks,
Howard
what's the weather like when it acts up?
#7
05-08-2008, 02:39 PM
Join Date: Nov 2005
Location: Washington
Posts: 21,060
RE: Engine Occassionally Misses - 2007
Hey Howard, not sure about the miss, but I did have a question for ya. Why did you only o up one tooth in the back, you do know that 1 down in the front is equal to 3 up in the rear right? I can't even imagine a person could tell a difference in just one tooth up in the back. Just curious.
#8
05-10-2008, 05:20 AM
Late Replies
Hello A16tony & Deej:
Sorry for the late replies. The last time it missed / stalled badly it was a warm / hot windy day and I'd been pushing the wind for 20 minutes or so. I spent last night going over many of the connections, cleaning them with steel wool, etc. Went for a ride this morning & thought I had it beat - then 15 minutes into a warm head wind & she started to miss. Turned around & rode home with a tailwind & no misses. Was about to turn back into the headwind again to see if that really had anything to do with it - but I picked up a big chunk of wire and the rear went flat. Limped home instead. I don't see what a headwind could have to do with it except the motor works harder pushing the resistance?
The larger rear sprocket was on the bike when I bought it. I'm probably wrong about it being +1, its probably +5 or so. I was too lazy to go count.....
I forgot to mention that I'm running an Acerbis tank, and a local mechanic suggested the hose for the tank vent might have been kinked. After the misses this morning I routed the hose freely. After changing the rear tire tomorrow I'll see if that helped.
Thanks for all the ideas.
Howard
Sorry for the late replies. The last time it missed / stalled badly it was a warm / hot windy day and I'd been pushing the wind for 20 minutes or so. I spent last night going over many of the connections, cleaning them with steel wool, etc. Went for a ride this morning & thought I had it beat - then 15 minutes into a warm head wind & she started to miss. Turned around & rode home with a tailwind & no misses. Was about to turn back into the headwind again to see if that really had anything to do with it - but I picked up a big chunk of wire and the rear went flat. Limped home instead. I don't see what a headwind could have to do with it except the motor works harder pushing the resistance?
The larger rear sprocket was on the bike when I bought it. I'm probably wrong about it being +1, its probably +5 or so. I was too lazy to go count.....
I forgot to mention that I'm running an Acerbis tank, and a local mechanic suggested the hose for the tank vent might have been kinked. After the misses this morning I routed the hose freely. After changing the rear tire tomorrow I'll see if that helped.
Thanks for all the ideas.
Howard
#9
05-10-2008, 04:38 PM
RE: Late Replies
Its probably a 47 tooth. Thats the most common rear size that is the smallest for kawasaki on the net. I mean u can get smaller but u gotta do ur research. Well I am off on my 45 mile ride home to my parents house from my apartment so I will message u guys when I get over the skyway bridge with my bike and make it home. I really need a camera mount so I can take ya guys some pics.
#10
05-12-2008, 02:16 PM
RE: Late Replies
Without knowing you true set-up, I would say your a touch lean. Can you do some homework.
Air box: snorkel size, stock, large, or none
Jetting: has it been changed?
Sprocket sizes:
And, a test that works for me. In third gear, cruise and tach up from 7000 to 9000 rpm. So get up to 7000 and hold it for 20-30 seconds. do the same for 8000 and 9000. If the bike starts bucking around, it's too lean. Jet up.
Let us know what you find.
Air box: snorkel size, stock, large, or none
Jetting: has it been changed?
Sprocket sizes:
And, a test that works for me. In third gear, cruise and tach up from 7000 to 9000 rpm. So get up to 7000 and hold it for 20-30 seconds. do the same for 8000 and 9000. If the bike starts bucking around, it's too lean. Jet up.
Let us know what you find.