1200s running like a bag of hammers

[dave the german]

Well had the bike at John's yesterday to do a throttle body balance and it was running crap - it's never been the smoothest but having not ridden one before buying thought it was normal with that throttle. Anyway the bodies didn't seem too bad but it was impossible to hold the throttle at 1800 revs - the revs kept rising. Whipped plugs out and the right plug (main plug) showed really lean running. maybe a dodgy plug so eventually changed all 4 and no difference. Plugged GS911 in and it showed that there had been an injector fault code but wasn't present at the time. I've changed coil packs (only main ones as they are different on the BCR). Anyone else experienced anything similar? Possibly fuel pump or injector? We're going to swap bits over in the hope that we can find the source of the problem but in the meantime any help/thoughts/advice welcome

John if I've missed anything please feel free to add

[ted]

could it be old stale fuel? Is it possible there is am air leak somewhere making it run weak? I assume the plugs you used were new and not old ones from the back of the garage - the only issue ive ever had was a plug even though they were iridium and not that old - i swapped the lots and it was back to normal

[Steptoe]

Try resetting all adaptations using the GS911.

[dave the german]

I think a reset was done with the 911 - Fortunately we can swap parts and go through a process of elimination. I did think about stale fuel but the fuelling has never been great so sort of discounted that

[Hay Ewe^]

on the 1150 and 1100 there are two rubber plugs that go over small pipes that are used to connect vacuum gages or manometer.
of one of these is allowing outside air in it will cause lean running even though the moronic and TPS are working fine.
Other bleed air leaks will cause the same.

I know you have a 1200 but I dont have any knowlodge of those so just a suggestion

[slparry]

My Boxercup ran rough when the throttle position sensor was out of adjustment Dave, perhaps it's the issue with your 12?

[dave the german]

Thanks Steve that was also mentioned - can you use the GS911 to reset everything if the throttle position sensor is changed?

[slparry]

Thanks Steve that was also mentioned - can you use the GS911 to reset everything if the throttle position sensor is changed?

yes

[Stanley]

I don't know if this helps... but..
I have done TBS on loads of R1200 bikes, however; my 1200S will NOT run properly if I park the steppers with the 911. It will just about tick-over, but as soon as I touch the throttle the revs race ever higher. If I disconnect the steppers the revs immediately race.
I've taken to balancing them at about 3,500 - 4,000 rpm without parking the steppers first. It runs perfectly But you need to be quick with your adjustments and have a good fan on the engine!

As mentioned previously, re-set all adaptations with the 911. Or at least calibrate the steppers.

[dave the german]

tickover is OK going through the revs it feels lumpier than it was. Where I don't have confidence is down shifting - when blipping the throttle I have to give it a big handful as sometimes it cuts out - clutch switch is working fine - it will start in gear. As the 911 revealed an injector fault going to swap these with injectors I know work OK and take it from there. All reset when 911 was plugged in

[slparry]

tickover is OK going through the revs it feels lumpier than it was. Where I don't have confidence is down shifting - when blipping the throttle I have to give it a big handful as sometimes it cuts out - clutch switch is working fine - it will start in gear. As the 911 revealed an injector fault going to swap these with injectors I know work OK and take it from there. All reset when 911 was plugged in

did you try balancing the throttle bodies at 3000 rpm with the stepper motors disconnected?



http://www.motorcycleinfo.co.uk/index12 ... eId=264844

[dave the german]

tickover is OK going through the revs it feels lumpier than it was. Where I don't have confidence is down shifting - when blipping the throttle I have to give it a big handful as sometimes it cuts out - clutch switch is working fine - it will start in gear. As the 911 revealed an injector fault going to swap these with injectors I know work OK and take it from there. All reset when 911 was plugged in

did you try balancing the throttle bodies at 3000 rpm with the stepper motors disconnected?



http://www.motorcycleinfo.co.uk/index12 ... eId=264844

Don't think we did Steve - to be honest I hope it is "just" an injector and it solves the problem rather than going through a long process of elimination

[nab 301]

Whipped plugs out and the right plug (main plug) showed really lean running. maybe a dodgy plug so eventually changed all 4 and no difference.

I can't help on diagnosis but isn't the R/H side the one that randomly dropped valves on the early 1200's? Advice , get it sorted quick before something like this happens (admittedly on a race bike) viewtopic.php?f=4&t=20764

[dave the german]

Whipped plugs out and the right plug (main plug) showed really lean running. maybe a dodgy plug so eventually changed all 4 and no difference.

I can't help on diagnosis but isn't the R/H side the one that randomly dropped valves on the early 1200's? Advice , get it sorted quick before something like this happens (admittedly on a race bike) viewtopic.php?f=4&t=20764

Yep I remember that

[dave the german]

further update - had the bike to a local independent and it appears throttle bodies were massively out - running MUCH better but he did comment that it didn't like cold running but suggested given it a good couple of hundred mile run out. I know with new cars ECUs adjust themselves so I'm hoping this will solve it. Starting to feel that it might have been stale fuel. After a good ride out I'm going to fit the power commander and hopefully I should see smoother running. The good news is the independent went right through the bike and couldn't see anything untoward