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Very Hot Topic (More than 25 Replies) Should this even be running? (Read 1194 times)
Barry
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Re: Should this even be running?
Reply #45 - 06/26/18 at 12:02:58
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R65Guy wrote on 06/26/18 at 10:45:05:
I thought the adjusters control air flow instead of fuel flow.  A bad oring can play havoc.


As CV carbs they are primarily considered to flow fuel so turning them in weakens the mixture and out richens which is the opposite of what air screws do on slide carbs.

To be pedantic, due to the auxiliary air jet they actually flow a pre-mix of air and fuel.
  

Barry Cheshire, England 79 R45
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wilcom
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Re: Should this even be running?
Reply #46 - 06/26/18 at 12:38:59
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R65Guy wrote on 06/26/18 at 10:45:05:
thought the adjusters control air flow instead of fuel flow.


I'm going back over that now... I have two YOUTUBE animations , one shows CV carb with the idle screw metering the fuel, the 2nd shows the idle jet metering at a point where you have both fuel and air,,,,, have not found a R65 BMW Specific diagram yet. I do not have the patience for Snow Bums site right now. I'll continue searching the Web for a  understandable diagram.
  

Joe Wilkerson
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1982 R80RT 
1974 R90/6     
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Barry
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Re: Should this even be running?
Reply #47 - 06/26/18 at 13:56:49
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No question that A Bing CV mixture screw flows a pre-mix of fuel and air. This isn't actually a Bing but it shows it nicely with a colour legend and I guarantee a Bing works the same way. 
  

thm_carb4_005.gif ( 36 KB | 3 Downloads )
thm_carb4_005.gif

Barry Cheshire, England 79 R45
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wilcom
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Re: Should this even be running?
Reply #48 - 06/26/18 at 14:56:07
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R65Guy wrote on 06/26/18 at 10:45:05:
A bad oring can play havoc.
                   


Barry thanks for that diagram, that was one of the animations that I had seen on youTube(very close).

R65Guy.... the O-rings could be my issue. I had a hard time trying to figure out what O-ring went where. None of them seem to fit nicely anywhere, all wanted to be stretched to almost breaking to go on. I might have flubbed the rings. I will get another set and replace them b4 I go any farther.

Thanks Guys
  

Joe Wilkerson
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1980  R65          
1982 R80RT 
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georgesgiralt
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Re: Should this even be running?
Reply #49 - 06/27/18 at 02:12:09
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Hello,
Check your idle needles for wear.
Then gently screw them in, and open them a little (1/2 turn if my memory serves me right).
The idle srew have to be opened t'ill you can see a wee bit of day between their tip and the butterfly flat, then gently go to contact and give them a half turn (again from memory).
Then you will have the base setting for the bike to start and adjust.
Your situation was that a mixture screw is giving way too much mix and the engine is apt to run on this one alone.
  
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wilcom
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Re: Should this even be running?
Reply #50 - 06/27/18 at 09:32:43
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georgesgiralt wrote on 06/27/18 at 02:12:09:
Your situation was that a mixture screw is giving way too much mix and the engine is apt to run on this one alone.


My situation in my mind is........ If it's idling perfectly at 900 rpm and I can't vary the RPM or quality of idle with either idle adjustment screw, am I actually idling on that ckt?

I've checked the butterfly's for daylight, I have backed off the adjusters for choke and throttle so there is no input with those ckts. I have agonized with the assembly of my enriching devices to make sure I have them correct. (thank you Barry for the most understandable instructions for their orientation in one of your posts)

A lot of my "head scratching" is that I really DO NOT HAVE A PROBLEM, it idles correctly, no off idle lag, seems to pull well thru the gears at all rpm's(during my around the block testing under 65mph)....... the PROBLEM is that it is not acting correctly to adjustments. A similar situation would be a doctor telling a patient to take deep breaths while listening to his chest and detecting NO abnormalities. and as the patient puts on his shirt the Doctor notices that the patient has Duct Tape covering his mouth and nose. Huh Maybe the Doc and I should just go have a beer. Grin

R65Guy did hit on a fact with the O-rings. I had a devil of a time trying to figure out what O-ring went where. I could have the WRONG O-ring on BOTH idle screws(making both sides act the same or in my case NOT ACT AT ALL.  I'll look for new O-rings next.

Anyone have a source for O-rings where I don't have to buy gaskets and Diaphragms too ?

I'll be checking for information (got to go to O-ring school)on the rings as it looked like none of the rings I had, fit properly on any shaft that I was trying to put a ring on, either too lose or too tight. If anyone has a link to "O-ring school" I'd love to go there.
  

Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
past:
1979  R65   
1980  R65          
1982 R80RT 
1974 R90/6     
1972  R75        
1964 R50
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Barry
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Re: Should this even be running?
Reply #51 - 06/27/18 at 13:11:48
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wilcom wrote on 06/27/18 at 09:32:43:
Anyone have a source for O-rings where I don't have to buy gaskets and Diaphragms too ?

I'll be checking for information (got to go to O-ring school)on the rings as it looked like none of the rings I had, fit properly on any shaft that I was trying to put a ring on, either too lose or too tight. If anyone has a link to "O-ring school" I'd love to go there.


In the 12 years I've had mine I've only ever use standard NBR O rings from a 400 piece Metric O ring Kit.  I use whatever seems to fit and have never had problems. But I do have the specified sizes and part no's for reference.


 
  

O_rings.PNG ( 6 KB | 3 Downloads )
O_rings.PNG

Barry Cheshire, England 79 R45
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Bob_Roller
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Re: Should this even be running?
Reply #52 - 06/27/18 at 17:15:47
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Joe, so your situation, is that you get no rpm response when adjusting idle mixture ??
  

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wilcom
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Re: Should this even be running?
Reply #53 - 06/27/18 at 18:12:11
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Bob_Roller wrote on 06/27/18 at 17:15:47:
Joe, so your situation, is that you get no rpm response when adjusting idle mixture ??


exactly:
Idling perfectly but unable to effect any change with idle mixture screws, screwed closed or fully open4-6 turns, no detectable change in the idle speed or quality at all

Video here of bike idling away 1 hour ago
https://www.youtube.com/watch?v=A_9NIlrdlFc
  

Joe Wilkerson
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Present:
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past:
1979  R65   
1980  R65          
1982 R80RT 
1974 R90/6     
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Bob_Roller
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Re: Should this even be running?
Reply #54 - 06/27/18 at 18:15:54
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I have had this happen, the idle jets were clogged .
The metered orifice at the end of the jet is almost impossible to determine if it is clogged or not .
If you take a can of carb cleaner, with the extension tube on the nozzle, place it on the end with the screwdriver slot .
Then cover the two sets of holes in the jet body to contain the cleaner, fluid should come out of the end if it is clear .
  

'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 !!!!!
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wilcom
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Re: Should this even be running?
Reply #55 - 06/27/18 at 18:34:59
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Bob_Roller wrote on 06/27/18 at 18:15:54:
I have had this happen, the idle jets were clogged


Let me give that a try in the morning, as I gotta work tonight.

I have had these guys apart 3-4 times, initially soaked in Berryman's and squirted thru every orifice I could find. But you have a point there. When I squirt in the orifice and I see it coming out somewhere else I assume it's OK...... but with multiple paths it could be squirting out 2 holes and there is a 3rd clogged. Good call, makes sense.

I'll report back.............
  

Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
past:
1979  R65   
1980  R65          
1982 R80RT 
1974 R90/6     
1972  R75        
1964 R50
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