The BMW GS boxer twin thread

[Eddieb]

Anyone know where to get 40mm Bing carb diaphragms at a decent price, quickly?

One of mine appears to be stretched, it won't seat properly and seems to somehow become about 1cm larger diameter than it should.

I just rang my friendly dealer and she was just as surprised at the $96 each cost from BMW NZ.

[Taz]

Here's a kit and a walk through......

http://www.adventuremotogear.com/bin...gms-p-159.html


http://www.gunsmoke.com/motorcycling...ild/index.html

[Eddieb]

Thanks Steve, careful application of the drill and I have my right hand carb open now.

I've found why it was running like shite. The diaphragm is holed with a chunk missing out of one edge 3-4mm round. The carb looked like shit, black and moist everywhere but it cleaned up well.

Also the needle jet was really full of gunk so thats been cleaned right out and a new needle jet installed. The vents around the needle jets were completely blocked in both carbs. A new needle will go in when I have new diaphragms then it should rock.

So, anyone know when I can get 2 diaphragms for 40mm carbs in a hurry without paying the $96.80 each BMW want to rape me for?

[Eddieb]

There's a REALLY REALLY nice PD just been advertised on trade me.

Black with full luggage it's the 'classic' model which I think was a final edition model.

Bidding currently at $4000 and reserve met.

This thing looks mint, if you've been wanting one, check out this one.

http://www.trademe.co.nz/Trade-Me-Mo...-238242202.htm

[igormortis]

There's a REALLY REALLY nice PD just been advertised on trade me.

Oh Lord, that link is dangerous...

[Eddieb]

Yeah but you have an addiction and you're even more afflicted than I am.

[dino3310]

these GS models are just friggin awesome, wish i could afford 2 bikes
i love Kokpelli's r80gs basic

http://www.trademe.co.nz/Trade-Me-Mo...-237971455.htm

[Eddieb]

not mine but just saw it

The side stand kit will be $165, a bargain compared to similar kits from Europe. http://ozadvntr.smugmug.com/photos/4...0_qujYh-XL.jpg
contact info
Michael Jaeger 0421276875

Where did you see this, is it supposed to be in NZ or oveseas?

[Eddieb]

Well, spent a bit of time in the garage this weekend.

The PD now has:

New Needles
New Needle Jets
New Allen head carb screws
Cleaned out fuel passages, geez there was a lot of gunk in the jet passage
Replacement 'Bean can' installed, big thanks to Igormortis
New Pivot Pegz
Gear lever adjusted to suit Pivot Pegz
Front pads removed and sanded down as they were a bit glazed and hadn't been bedding in that well
Headlight dropped off to Bryce at 'Buckets & Bits' for some remedial surgery

Hopefully my new diaphragms will arrive in the post Monday. I sourced a pair from R-Twin works in Palmerston North for $49 included shipping. Once those are in I can reassemble the carbs and she should be all go.

And I took the R80 out for a quick spin this morning, she's rocking along well. Lots of fun around twisty city streets.

[MXNUT]

Well, spent a bit of time in the garage this weekend.

The PD now has:

New Needles
New Needle Jets
New Allen head carb screws
Cleaned out fuel passages, geez there was a lot of gunk in the jet passage
Replacement 'Bean can' installed, big thanks to Igormortis
New Pivot Pegz
Gear lever adjusted to suit Pivot Pegz
Front pads removed and sanded down as they were a bit glazed and hadn't been bedding in that well
Headlight dropped off to Bryce at 'Buckets & Bits' for some remedial surgery

Hopefully my new diaphragms will arrive in the post Monday. I sourced a pair from R-Twin works in Palmerston North for $49 included shipping. Once those are in I can reassemble the carbs and she should be all go.

And I took the R80 out for a quick spin this morning, she's rocking along well. Lots of fun around twisty city streets.

Should be able to get some REASONABLE fuel consumption out of it now that it has 2 working carbs

[Waihou Thumper]

Well, spent a bit of time in the garage this weekend.


Hopefully my new diaphragms will arrive in the post Monday.

You should go on the pill Eddie, they are tricky to insert mate, especially for us blokes...Is that why you got two then? If you don't succeed with the first, have a back up...

[Eddieb]

Should be able to get some REASONABLE fuel consumption out of it now that it has 2 working carbs

Here's hoping. I was down to 11km/litre on the last tank and wasn't getting the grin factor you should with that sort of economy. When we pulled the plugs it was obvious the cylinder I had been able to access was running not too bad but the other one was serious rich.

[Underground]

You should go on the pill Eddie, they are tricky to insert mate, especially for us blokes...Is that why you got two then? If you don't succeed with the first, have a back up...

Funny you should say this ,I've heard of Africa Twin riders using condoms as emergency carb diaphrams successfully.

[igormortis]

Nice to hear you're getting things sorted Eddie!

Now, does anyone know where I can get a 41mm spanner? I need one so I can torque down my fork top bolts.

[Eddieb]

Well she lives again, My diaphragms were in the letterbox when I got home tonight so she's now (mostly) back together again.

Timing has been set up as close as I can do on my first effort of doing it alone and it's idling between 900-1000rpm.

Hopefully the chunk out of the diaphragm you can see below is the cause of most of my worries, along with worn needles and needle jets.

However I'm fully expecting it to run like a dog under power as it's been set up with all the worn out parts in it,. I'll probably find the carbs are way out of sync and it will be way rich or lean and I'll spend most of next weekend tweaking it.