The BMW GS boxer twin thread

[Box'a'bits]

Well, I just spent time in the garage changing coils over to see if that was the issue, and it isn't.

Put the PD coil in the G/S. Turns over fine but no spark, same behavior as before.
Put the G/S coil in the PD. It runs.

While I had the PD coil off I did notice it didn't seem to have been making good contact on the right cylinder. The inside of the coil connector had quite a buildup of green on the copper.
I cleaned it up best I could with what was to hand, which wasn't much, and buffed up the contact on both cables with a bit of mild sandpaper plus spread the contacts a bit. Will have to wait and see if it makes any difference.

So all you experts, whats next? Is there another step I can easily test or is it off to a professional?

What are your earths like. Check the battery terminal, & the earth that the other end of the cable runs to. Also check where the coil is earthing to.
What condition is the battery in? Sometimes there is enough charge to spin the starter, but not fire the ignition. Try pulling the Electronic Ignition off (on top frame tube) & heat sink 'paste' the heat sink (don't think that this will be the issue, but may be one of a couple of neglected areas).
Have you swapped over the EI from the PD?
You have an advantage of being able to swap components between two bikes. I think the ignition systems are basically the same. Failing all else, I'm come over & tamper with things next weekend.

Steve

[Eddieb]

is the coil getting a)voltage and b)pulses from points?Does the r 80 run points or is it the same system as the PD

No f'ing idea. I've about exhausted my electical knowledge. I could probably test voltage to the coil once I figure out what voltage it's suppoed to have, to a) not blow up my multimeter by having it on the wrong setting, B) have some idea of what the correct reading is so I know whether what I am seeing is correct or not.

[BMWST?]

all i jknow is you should be getting 12v to the coil on the "input side"That 12v is interupted by the ign system which triggers the output side of the coil to give the big spark voltage....

[BMWST?]

R100GS on trade me

http://www.trademe.co.nz/Trade-Me-Mo...-221551788.htm

it went for 7860 in the end,prolly ok considering its mileage and condition

[Eddieb]

it went for 7860 in the end,prolly ok considering its mileage and condition

Thats pretty good money, it looked pretty tidy but wasn't exactly a late model bike.

I went down to the garage today and played with the G/S a bit more. Put the coil back in and tried some experiements suggested on advrider.

No joy getting it started but I noticed when I switch the key off there's spark. Just in case it was a random event I tested it a few times and every time the key is switched off the plugs spark.

I'm guessing then that the coils and everything are fine, but it's the trigger or something related to it thats bung.

That requires removing the front cover for futher investigation. Something that requires more time and space than I currently have.

[Kokopelli]

it went for 7860 in the end,prolly ok considering its mileage and condition

The guy was asked about leaks and said that there weren't any. I can't see that lasting once the bike is being run.

Bikes that have been kept as ornaments tend not to do to well in the long run. Cosmetics won't get you home, or something like that....

[BMWST?]

The guy was asked about leaks and said that there weren't any. I can't see that lasting once the bike is being run.

Bikes that have been kept as ornaments tend not to do to well in the long run. Cosmetics won't get you home, or something like that....

my one should be a goody then

[marks]

Thats pretty good money, it looked pretty tidy but wasn't exactly a late model bike.

I went down to the garage today and played with the G/S a bit more. Put the coil back in and tried some experiements suggested on advrider.

No joy getting it started but I noticed when I switch the key off there's spark. Just in case it was a random event I tested it a few times and every time the key is switched off the plugs spark.

I'm guessing then that the coils and everything are fine, but it's the trigger or something related to it thats bung.

That requires removing the front cover for futher investigation. Something that requires more time and space than I currently have.

are you able to switch the key on and of 3-4000 times a second?

[xwhatsit]

No joy getting it started but I noticed when I switch the key off there's spark. Just in case it was a random event I tested it a few times and every time the key is switched off the plugs spark.

I'm guessing then that the coils and everything are fine, but it's the trigger or something related to it thats bung.

That requires removing the front cover for futher investigation. Something that requires more time and space than I currently have.

What the. That's weird. Do you think it's simply a bung ignition switch then? I've had a couple of Honda switches fail on me (don't know how the Bimmer switches stack up) and they cause really strange intermittent problems that cause one to tear their hair out.

If you haven't already checked it... try checking it, but with a test light so you're putting some wattage through it.

Apologies if you've already been there.



Near $8k... fookin' bananas.

[_Shrek_]

Thats pretty good money, it looked pretty tidy but wasn't exactly a late model bike.

I went down to the garage today and played with the G/S a bit more. Put the coil back in and tried some experiements suggested on advrider.

No joy getting it started but I noticed when I switch the key off there's spark. Just in case it was a random event I tested it a few times and every time the key is switched off the plugs spark.

I'm guessing then that the coils and everything are fine, but it's the trigger or something related to it thats bung.

That requires removing the front cover for futher investigation. Something that requires more time and space than I currently have.

Eddieb I have a new ignition switch with key for the 1150Gs if you want to borrow it to see if that fix's the prob

[Eddieb]

Eddieb I have a new ignition switch with key for the 1150Gs if you want to borrow it to see if that fix's the prob

Thanks for the offer. At this stage I've no reason to suspect the ignition switch, everything else running of it works great.

[BMWST?]

i reckon its the "trigger" for the coils.When you turn the key off you are emulating the "opening of the points".I think that means the hall sensor is toast,but i dont know enough about the boxers to say that is the ecu or in the "beancan" under the timing cover

[Eddieb]

i reckon its the "trigger" for the coils.When you turn the key off you are emulating the "opening of the points".I think that means the hall sensor is toast,but i dont know enough about the boxers to say that is the ecu or in the "beancan" under the timing cover

Thats what I am thinking. I have a 'how to' doc from GSers to establish whether thats it or not. It's under the timing cover.

[Eddieb]

Another R100GS PD on Trade Me. This one's REAL nice.

http://www.trademe.co.nz/Trade-Me-Mo...-224417000.htm

[igor]

Another R100GS PD on Trade Me. This one's REAL nice.

http://www.trademe.co.nz/Trade-Me-Mo...-224417000.htm

i like this 1 but i am biased. its for sale.

2 owners - ohlins - heaps of bits - rear sub frame and bits all power-coated- what ya see is what ya get

got me home every time for the last 11 years and I ant given it away. Look at the shit it has. Don't really care if it sells or not but make me a decent offer and ya could own it. and no ya cant but the good bits individually

and yes it is dirty. why clean it if it is only gunna get dirty again. It does what it is made for