929 low rpm problem-PLEASE READ
#1
929 low rpm problem-PLEASE READ
ok guys-recently my 929 has been developing a low rpm stumble to it-anything less than around 2200 rpms it idles fine, but if you give it any more than 1/4 throttle it bucks and stumbles and kicks-then at 2kish-it launches. when you give it full throttle from idle in neutral you can hear it lug for a split second-its a 2001 with a full muzzy exaust, power commander III, and k&n filter. It just started doing this recently (well after the mods) and richening the mixture (or leaning it for that matter) has no effect on the problem-neither does changing maps on the power commander. It runs great after 2k-can't keep the front wheel on the ground-but the stumble is irratating and hurts my launch-anyone have any ideas? the bike has almost 14k on it. Mike
thanks, problem is irratating as h***
I have almost any spare part that could need changing-should i buy a set of spark plugs for it? no smoking or abnormal noise besides the lugging. thanks again. Mike
thanks, problem is irratating as h***
I have almost any spare part that could need changing-should i buy a set of spark plugs for it? no smoking or abnormal noise besides the lugging. thanks again. Mike
#3
Re: 929 low rpm problem-PLEASE READ
ALWAYS kept indoors-never left in the rain-but i have a sneaking suspicion either the fuel filters getting plugged or the plugs need changing-almost 14k seems to be warranting a new one of both if they havent been done-keep the suggestions coming, Mike
#4
Re: 929 low rpm problem-PLEASE READ
yeah its gotta be plugs..., or fuel injectors? cause thats how my friends f4i is, has trouble holding idle but does fine in high rpm plus he knocks when wheeli'n
#6
Re: 929 low rpm problem-PLEASE READ
I just went some rounds with a 929 last week at work, and I know exactly what you're talking about. Does the exhaust eliminate the valve that the stock system has? If it eliminated the excv (exhaust control valve) you still have to run the servo motor under the tank. It has a cable that also operates the flap in the airbox. If you disconnected it, you'll get an FI code (usually 9 flashes of the FI light). It will also run like you are describing if the cables for the exhaust valve and/or the airbox flap are adjusted wrong.
#7
Re: 929 low rpm problem-PLEASE READ
yes-got rid of the exup-and the cables, and the airbox flapper-gutted the entire system. left the servo hooked up in the default position as well, and no fi light. also, it ran great for over 1000 miles after i did all the mods-the sputtering just started-this is why i doubt its the servo or exup. Mike
#8
Re: 929 low rpm problem-PLEASE READ
The only other thing I can think of is the throttle position sensor. You can check it with an analog ohm meter. Disconnect the plug and put the probes from the meter on the top and middle pins on the t.p.s. Set the meter for resistance (ohms) and slowly turn the throttle. You should be able to watch the needle on the meter move smoothly from fully closed to fully open throttle. If there are any flat or dead spots, the t.p.s. is bad. Hopefully that will help you find the problem.
#9
Re: 929 low rpm problem-PLEASE READ
Originally Posted by charkly
ok guys-recently my 929 has been developing a low rpm stumble to it-anything less than around 2200 rpms it idles fine, but if you give it any more than 1/4 throttle it bucks and stumbles and kicks-then at 2kish-it launches. when you give it full throttle from idle in neutral you can hear it lug for a split second-its a 2001 with a full muzzy exaust, power commander III, and k&n filter. It just started doing this recently (well after the mods) and richening the mixture (or leaning it for that matter) has no effect on the problem-neither does changing maps on the power commander. It runs great after 2k-can't keep the front wheel on the ground-but the stumble is irratating and hurts my launch-anyone have any ideas? the bike has almost 14k on it. Mike
thanks, problem is irratating as h***
I have almost any spare part that could need changing-should i buy a set of spark plugs for it? no smoking or abnormal noise besides the lugging. thanks again. Mike
thanks, problem is irratating as h***
I have almost any spare part that could need changing-should i buy a set of spark plugs for it? no smoking or abnormal noise besides the lugging. thanks again. Mike
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