Hi all.
I have a 2001 M900S ie (fuel injected, obviously). I have two questions/issues for you guys:
1) What is the normal idle RPM for 2001 M900? My bike has a PCIII and has been tuned and it currently idles at around 850-900 RPMs. That seem really low to me. I even had a friend mention to me (in a joking way) that if seems so slow that he feels like he can actually see the pistons moving back and forth.
If 850-900 RPMs is low is there a way to adjust the idle?
2) The more serious issue (IMO) is throttle response. When my bike is idling and I give the throttle a quick blip (twist of the wrist) the bike does not respond instantly. It kind of lags and gives a bogged throttle response. If I give it another real quick blip (right behind the first) it will sometimes even kill the bike (stalls). If I make the throttle twist slow the bike is fine or if I blip the throttle at a higher RPM (like while slowing down for a stop) the throttle response is instant and smooth.
It is interesting to note that if I have the chock slightly engaged the quick throttle blip is instant. No lag and no bog. This tends to make me think that the very low RPM and throttle response may be related.
Sorry for the long post and thanks in advance.
Take a look up above, I think I have sorta answered your same issue - Topic: starting and bogging issue
The " choke " isn't a real choke on the FI motor, it just opens the throttle a bit, i.e. doesn't enrich the mixture like a real choke does.
I like a real slow idle, on my carbied 'bikes I have them catatonic, but the only time I let them idle slow is at the traffic lights, especially if there's any Harleys around :-)
My Monster idles at around 900 rpm when hot. When cold I have to twiddle the twistgrip a little or it may stall when I snick it into 1st gear.
Most Ducs typically like to idle about 1100 rpm.
1100 rpm. on an injected bike you wind out the air bleeds then richen the idle trimmer as winding out the air bleeds leans them out. if you've had a pc3 mapped that will also throw out your map at low throttle somewhat, which is why you get all the basic stuff done before you get a pc3 mapped.
idle too low is allegedly bad for big ends, especially on roller crank things like bevel drives.
900m always had a flat spot when blipped in neutral. just how they are, there must be a lean spot in the fuel map at at low throttle and 1200 or so rpm. or it could be the interaction between the idle spark advance and the spark map. i asked one angry owner if it happened when he was riding and he said no, so i said it didn't matter then. which made him even angrier.
For what it's worth, my '99 M900 (carbed) idles hot around 1200 RPM. I think the service manual says 1300 +/- 200 RPM.
ok, so I obviously need to have the idle upped a little. Can that only be done via a diagnostic tool? Hard to do?
Could any of this be caused by a TPS that is out of calibration?
thanks for all of the replies?
Assuming the throttles are synched turn the air bleeds (the brass screws in the intake manifolds) counter clockwise until the desired idle speed is reached. DO NOT touch the throttle stop screw. This may lean out idle too much, requiring a CO trim adjustment which requires a diagnostic tool and an exhaust analyzer. Yes it could be a TPS problem. Did this happen after a service?
Quote from: howie on June 16, 2011, 05:51:52 PM
Assuming the throttles are synched turn the air bleeds (the brass screws in the intake manifolds) counter clockwise until the desired idle speed is reached. DO NOT touch the throttle stop screw. This may lean out idle too much, requiring a CO trim adjustment which requires a diagnostic tool and an exhaust analyzer. Yes it could be a TPS problem. Did this happen after a service?
How do I know if the throttles are synched?
I just bought the bike about 2 months ago. I don't recall if being so noticeable then. I really started noticing it after I had a PCIII installed and a custom mapped created.
Just so I am sure I understand....by turning the air bleeds it will NOT affect my CO trim, correct?