bike sputtering
- Thread starter rch316
- Start date
Scipione420
Registered
I only have 1300 miles and my bike its doing it. Can the plugs be gone that quick?
when i put a BMC"RACE" filter on mine it went whacko like that, took it off and all's good.
cobravenom39
Registered
You don't need spark plugs.
You need to pull your airbox and check the vacuum line.
You described EXACTLY WHAT MY PROBLEM was when my lines were loose.
Please do this for me!
I checked vacuum lines on the bike and that was fine. I took out the filter and rode around the block and that didnt change anything either. I disconnected my PC and reconnected the stock computer on the bike and the sputtering stopped. I am going to have a new map made for the bike and see if that solves the problem.
PC might be bad, they do go bad sometimes
i would try and put a zero map in it and see if it still runs funky, if so sounds like a PC issue
My 2001 did the same thing years ago. After I checked it with my wide band setup.........found the map to be very rich between 2% and 5% throttle opening. Not enough to create black smoke,......but the bike lurched at low speed steady throttle opening. The A/F ratio was between 11 and 12 to 1. After leaning it out to around 13.5 at low speed,.......the bike smoothed out. Since then,......I've tried different maps and seem to always had to do the same with the new map. Companies are not going to give you a fuel mileage map. Too much risk in running toward the lean side. I lost 8 mpg with my first map. After tuning it to the correct numbers,........I now run in the mid 40's for fuel economy and still make 20 hp above stock bikes.
All in all,.......if you don't find a vacuum leak. Please do as others have mentioned. Have it tuned. IMO,.....riding around with a wide band is much more accurate than any dyno tuning. Dynos are great for WOT,.......but not so much for low speed, part throttle riding. My two cents! Let us know what happens.
Not sure what a wide band setup is? Can you clarify on that?
I actually just took the bike out again and got the RPM's up over 10,000 and was still losing power with stock computer and PC unplugged. I am going to take my spark plugs out this weekend and see if they are fouled up. Bike is not sputtering as nearly as much with PC out but still is slightly.
I actually just took the bike out again and got the RPM's up over 10,000 and was still losing power with stock computer and PC unplugged. I am going to take my spark plugs out this weekend and see if they are fouled up. Bike is not sputtering as nearly as much with PC out but still is slightly.
just replace them, teh $12 it will cost is worth it even if they look fine.
If anyone is having the same problem I did I put the answer below from the company i bought my exhaust from:
"surging is a lean condition.If the bike lays down at high rpm that is also a lean condition. We have dynoed a brand new 08 with 300 miles on it and that fuel system was all stock and pulled right up to redline , making 170.1 hp. When you added the K+N filter you also leaned it out even more. Put the stock aircleaner back in and I'll bet the performance picks up. That will document whether it is indeed lean or not. Any time you change an exhaust system out for a less restrictive system an engine generally has different fuel requirements, usually a higher level as hp is a product of a more dense fuel/air ratio."
I played with the settings on my PC III and raised the fuel on the low, mid, and high and the bike is running much, much smoother. I am going to take it to a motorcycle shop this week and have a new custom map made for it so that it is perfect.
I changed the spark plugs a few days ago and that was not the problem. Checked all vacuum lines and those were fine. If you run a PC on your bike and are unsure if thats the problem with your bike always consider that to be a good reason your bike is surging or sputtering.
"surging is a lean condition.If the bike lays down at high rpm that is also a lean condition. We have dynoed a brand new 08 with 300 miles on it and that fuel system was all stock and pulled right up to redline , making 170.1 hp. When you added the K+N filter you also leaned it out even more. Put the stock aircleaner back in and I'll bet the performance picks up. That will document whether it is indeed lean or not. Any time you change an exhaust system out for a less restrictive system an engine generally has different fuel requirements, usually a higher level as hp is a product of a more dense fuel/air ratio."
I played with the settings on my PC III and raised the fuel on the low, mid, and high and the bike is running much, much smoother. I am going to take it to a motorcycle shop this week and have a new custom map made for it so that it is perfect.
I changed the spark plugs a few days ago and that was not the problem. Checked all vacuum lines and those were fine. If you run a PC on your bike and are unsure if thats the problem with your bike always consider that to be a good reason your bike is surging or sputtering.
Change the plugs first. Then check the synch on the throttle bodies. If they were tuned well enough for the stock-restrictive air filter...you just magnified any maladjustment with a freer flowing element like a K&N. If you haven't disabled the pair valve yet, please do so. Not effecting anything you're currently describing, but will help on the downshifts.
That is all....
That is all....
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