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Author Topic: Near total loss of power  (Read 2452 times)

Offline R65Guy

  • Lives in Foothills of Mt. Olympus
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Re: Near total loss of power
« Reply #15 on: June 10, 2009, 08:03:31 AM »
Pierre,
Here is some good reading on diaphragms and Bings in general.... and those dreaded dome screws.  Before you start reading, go put some penetrating oil on those dome screws and let it begin to soak.  If they come loose easily the rest of the job is not difficult.  The screws have a broad tapered head that is prone to seizing to the dome.  Using a screwdriver with the tip ground down a bit might help keep the screwdriver from slipping.  Those are not normal phillips screws.

http://bmwmotorcycletech.info/bingcv.htm
http://bmwmotorcycletech.info/bingcv-2.htm

Neal
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81 R65 & 16 R1200GS

Offline Justin B.

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Re: Near total loss of power
« Reply #16 on: June 10, 2009, 09:25:42 AM »
I have never had any problems getting those screws out by using a hand impact.
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Justin B.

2004 BMW R1150RT
1981 R100RT - Summer bike, NEKKID!!!

Offline Bob_Roller

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Re: Near total loss of power
« Reply #17 on: June 10, 2009, 10:00:24 AM »
Using valve grinding compound on the screwdriver improves the 'grip' of the bit, to help prevent rounding out the screw head .

Worse case scenario, you can drill out the screw, and use a screw and nut .

When you get the screws out, I would recommend using stainless screws after that, the metric thread, and SAE 10-32 are compatible .
« Last Edit: June 10, 2009, 10:03:30 AM by Bob_Roller »
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'81 R65
'82 R65 LS
'84 R65 LS
'87 Moto Guzzi V65 Lario
'02 R1150R
Riding all year long since 1993 .
I'll give up my R65, when they pry my cold dead hands from the handlebars !!!!!

pierre

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UPDATE: Near total loss of power
« Reply #18 on: June 11, 2009, 04:07:59 PM »
I just removed the carb domes and removed the diaphragms to determine the one with a tear.

Should I be able to see the tear?  I gently stretched the diaphragms all around and cannot see any tear or hole.
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Offline Rob Valdez 79 R65

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Re: Near total loss of power
« Reply #19 on: June 11, 2009, 04:14:36 PM »
A pin-hole could be enough to affect it, or a bad seal around the inside diameter or the outside.  But the ID seal should have been apparent to you, and the OD should not have changed abruptly without being disturbed.

Check it with a bright light if you have not already done so.  (shining from "behind" the diaphragm)


I guess we need to move on to other possibilities.... :(

Did you check your float bowls and fuel flow?
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pierre

  • Guest
Re: Near total loss of power
« Reply #20 on: June 11, 2009, 04:56:32 PM »
Yes, both bowl were holding gas. The gas was clean, without debris. The floats moved freely.  And with the petcock switched to the on position,  a steady trickle of gas flowed.

Just looked at the diaphragms over a light and didn't see any holes.
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pierre

  • Guest
Re: Near total loss of power
« Reply #21 on: August 10, 2009, 07:46:07 PM »
not have this thread open ended, here's the final resolution.  
You'll be surprised . . .
http://www.bmwr65.org/cgi-bin/yabb2/YaBB.pl?num=1249863188
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