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pcwirepro 10-01-2012 06:44 PM

Stick coil question
So I "know" a guy that bought an '04 1150GS (dual-spark) a few months ago. He's been pulling his hair out since he bought it thinking that something just wasn't right. Or so I've been told.... New plugs, TB rebuild, injector cleaner, injector soak, throttle cables, 3x valve adjustment, 4-5x TB sync all with little to no improvement. Today while driving home from work he remembers reading a thread about testing stick coils by pulling one or the other. Well as it turns out one is dead. Moved it to the other side (he did that is) to confirm and the trouble moved with the coil.
So... how much improvement can he expect to see from a new coil or set of coils? Is performance affected more at higher RPM's and more noticeable under load as opposed to no load? Is BB the best (read cheapest) option for these?

Thanks for your input. I'll pass on any and all of your comments.

SR1 10-01-2012 07:41 PM

A. Shit. Load. DAMHIK


What is this? "BB" :cry

Adventure Trio 10-01-2012 07:42 PM


Originally Posted by SR1 (Post 19723954)
A. Shit. Load. DAMHIK. :cry

+1 :wink:

Experienced this myself.


pcwirepro 10-01-2012 07:44 PM

No Beemer Boneyard?
Too late to call and can't find them on their site. Hmmm.

lp6 10-01-2012 07:45 PM

night and day. during heavier acceleration above 4000 rpm, 3rd gear and up the bike will actually run rather than crap out

def 10-01-2012 07:45 PM

Think about this....a two cylinder boxer running on only one cylinder?

You make the call.

SR1 10-01-2012 07:48 PM

ahh, beemer boneyard. if the have them. might need to order through max like i did

pcwirepro 10-01-2012 07:49 PM

Secondary plug contributes?
Surely it isn't running on one cylinder if the secondary plug is firing. Could this have done damage over 2k miles?

pcwirepro 10-01-2012 07:50 PM


Originally Posted by SR1 (Post 19724011)
ahh, beemer boneyard. if the have them. might need to order through max like i did

$130/ea. at Max.

def 10-01-2012 08:21 PM


Originally Posted by pcwirepro (Post 19724014)
Surely it isn't running on one cylinder if the secondary plug is firing. Could this have done damage over 2k miles?

One cylinder's contribution to performance and power is severely compromised. You might as well be riding a 500cc thumper.

As for damage, I can't say.

scooteraug02 10-01-2012 08:53 PM

Try this, click here $80 two coils.


Originally Posted by HackyMoto (Post 16548894)

Am fortunate to have two GSís aí 04 1150 36k and a í06 1150 adv 47k both twin spark. Both started running ruff dropping a couple hundred rpmís at idle and missing under load. The coil sticks (one each) on both bikeís went bad within a couple weeks so thatís 2 timeís 140.00 or 4 timeís if oneís to replace them all. I didnít want to go back to the coil sticks because of the fail rate and the price so I started thinking what kind of alternative action I could take. I wanted a coil that was small available everyware and (cheep) (inexpensive) reasonably priced, I found it 1999- to present 5.4 Ford F-150Ďs C.O.P. coils checked the specs (Ohms) close enough and at 30 bucks each itís worth a try.
Pick-up two coils from the parts house and a wire harness from a ford 5.4 at the auto recyclers for the connectors on the coils. Plug wires Iíve had laying around.
I didnít want to cut the bikes wiring in case I wanted to ever go back to the stick coils, so I got four sub-d connectors that fit right into the bikes coil connectors.
Hook it up and Iíve got spark :happay
The coil are zippy tied to the frame for now if this works out Iíll mount them-up this winter.

Got about 200 miles so far allís well. :ilmostro
2 coils 60.00
Wire harness 10.00
Sub-d connectors 2.00
Plug wires ????

Beezer 10-01-2012 08:54 PM

here ya go....

by the way, Hacky is a top rider & we need to send him to South America to compete in the BMW challenge

EDIT.... ha.... Scooter ya beat me to it

scooteraug02 10-01-2012 09:03 PM

Google stick coil for motorcycle under shopping. Japanese bike coils inexpensive. Find one similar to BMW.

stick coil for motorcycle

SR1 10-01-2012 09:14 PM


Originally Posted by pcwirepro (Post 19724020)
$130/ea. at Max.

Yup, well aware of that, too. :cry

The Ford coils (or whatever) are certainly an idea, though it requires some garage space and some time to do, neither of which I had when I was fighting my coils (others here can attest to that). I was fighting it all from Korea (where I am now) and getting the right or wrong harness/assembly through the mail is a bigger issue than just ordering the damned part from Max or whomever and sucking it up. Sure enough, once the bad coil was replaced it was like riding a brand new bike. 2 probems I see with BB on the coils. 1, you hope they have the one you need (primaries are the same but secondaries are left/right specific) and also 2 what if the one they have is also shit? Coils are difficult to test according to what I've read, so even though it passes current and shows good impedance throught the body it may still be crap. Now you have an $80 used coil and STIL need a new one. I don't like to gamble, even when I'm in Vegas. I just pulled out my wallet and ate it. At least the bike runs now.

Eventually I'll probably switch to the car coils once I get to the US again.

vagueout 10-01-2012 09:59 PM

Would not bother jerking around with used coils, these things have a finite life. New coils and you will love your bike again.:*sip*

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