L/H Downpipe glowing

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notanotherbike

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Started my bike after two months, it fired up fine :thumb

It was sat on choke for a min or two & the L/H down pipe was glowing red... :mad:

so i turned the choke off & left to idle & it calmed down & wasn't glowing anymore.

Is this something i need to worry about.. do i need to check anything simple or should i just ride it & stop being a tart!!

Nab.
 
Firstly,if it`s an Oilhead,it ain`t 'choke' .....it`s fast idle.


Secondly,exactly how long was a 'min or two' ?

Many nobbers have left their bike running while kitting up,finishing breakfast,cutting the grass,etc etc and then been surprised that their bike is on fire.
It`s a mostly aircooled engine which needs forwards motion to cool it down so don`t leave it idling.

Maybe reason to investigate if literally for no more than a genuine minute or so ... or typical waiting for traffic lights to change.
 
notanotherbike said:
Started my bike after two months, it fired up fine :thumb

It was sat on choke for a min or two & the L/H down pipe was glowing red... :mad:

so i turned the choke off & left to idle & it calmed down & wasn't glowing anymore.

Is this something i need to worry about.. do i need to check anything simple or should i just ride it & stop being a tart!!

Nab.
Click to expand...

Sounds like it was over fuelling from being on choke, probably made worse from the throttle bodies needing a balance or the cable pulling a tiny bit and sending too much fuel to that side (LHS sitting on it has the TPS too).

Some other sarky tit can call you a tart!:green gri
 
AndrewD said:
Sounds like it was over fuelling from being on choke, probably made worse from the throttle bodies needing a balance or the cable pulling a tiny bit and sending too much fuel to that side (LHS sitting on it has the TPS too).

Some other sarky tit can call you a tart!:green gri
Click to expand...

There is no choke all the lever does is make it idle faster so it cant over fuel


As Tarka Said
 
It's just an optical illusion.

Touch the inside of your wrists against the down pipes and you'll feel they're both the same temperature.
 
Steptoe said:
It's just an optical illusion.

Touch the inside of your wrists against the down pipes and you'll feel they're both the same temperature.
Click to expand...

Your evil!!!:D:green gri

On the K's it looks like only the throttle is opened but the choke switch brings in the motronic, I'm assuming the R is the same as it's similar software.
 
You lot need to get out more.. and off your bloody high horses.

its easy enough for someone new to the GS to think its a choke... and why is that?

Because: IT SAYS SO ON THE LEVER. thus:

choke-1.jpg


A clever ploy by BMW to confuse... and give 'old women' something to get uppity about.

personally I never touch the thing.. I start the engine.. a touch of throttle.. into gear and away.

to the op.. don't let the bike idle. at the very least you run a high risk of knackering the Hall sensor.. which is rather expensive to replace.. and is one of the few things that can kill the bike stone dead if it fails.
 
R1150gsa, oilhead. Didn't have time to go out... just wanted to ease the guilt of not saying hello to her for two months by running her up!!

Started, one/two min till the temp comes up to one bar & then off to ide for a further 30secs. test the lights & then switch off.

I only saw it glowing 'cos it was going dark..

Thanks, will just start & go during the week... must say i'm nervous, not been out since down to london in dec.

Nab.
 
I'm 99.9% sure on the Motronic it does shift more than the throttle position, I know there is a hard to see electrical connection from the 'choke' to the motronic and I can't why this is not the same on the GS as it's Motronic too.

Any-hoo, loved the inside of wrist comment:clap:D

Happy to be proved wrong and too lazy to go outside and hunt in the dark for a possible cable to the phantom 'choke'.:type
 
AndrewD said:
I know there is a hard to see electrical connection from the 'choke' to the motronic and I can't why this is not the same on the GS as it's Motronic too.
Click to expand...

What are you talking about..................
 
Steptoe said:
What are you talking about..................
Click to expand...

Both the K's and the GS's use a Motronic ECU of the same generation, for ages it was generally accepted that there was no other function of the 'choke' other than to raise RPM. However there is a change in the fuel settings triggered by the same switch that everyone though just brought up the orange 'choke' light on the older K100's. Later the K1100's had no 'choke' light, however they still had a switch connection, here is a pic of the K1100 choke assembly...

clutchperch1.jpg


The switch tells the ECU that it needs to change the fueling, as there is no longer a light it would not otherwise be required.

The Motronic is the same type and generation on the GS, I'm trying to see if I can find a pic of where the choke operates the same switch as it's a different control.

This overlooked choke control has caught me and a few other out when trouble shooting issues with the K bikes, there is no reason for it not to be the same on the GS, it's just switched elsewhere.

Any-hoo, that or more likely would be 'a' reason for one pipe to be running hot, more likely is imbalanced throttle bodies either from use, setup or that little rubber plug underneath going AWOL letting air in and leaning the mix and running that side hotter.

Wish I'd just said he was a tart now!:blast:augie
 
Ow dus the same motronic drive a four cylinder engine?

The 11xx motronic is basically a single cylinder ecu (hence the name mo(no)tronic). On the boxers it uses batch injection (two shots per charge, one per revolution) and wasted sparks (one on the exhaust stroke) to let it drive a twin cylinder motor. Does it do the same on the four pot K's? - I guess it could treat them as two twin cylinder engines and use the same batching / spark scheme but that sounds even clunkier than the way they made it work with the boxer twins...
 
AndrewD said:
.

The switch tells the ECU that it needs to change the fueling, as there is no longer a light it would not otherwise be required.
I've lost count how many choke light switches i've unplugged over the years as they jam/stick and people get annoyed with the constant instrument light glowing.
Click to expand...

You can ignore the choke ( as most people do) on a K series and just open the throttle and it starts the same no matter how cold it is.

The coolant temperature switch on the coolant elbow sorts it out. .

Try activating just the choke electrical switch on a K series bike while the engine is running. If your statement is correct the idle should increase :augie.......... Well :D
 
Hot pipes

Fit a fire exstinguisher just in case or put it on Ebay QUICK!!!.
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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