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I installed Fcr39's on my 99 m750...

Started by TheInsider, October 29, 2015, 04:53:16 PM

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TheInsider

October 29, 2015, 04:53:16 PM
 And they are great!

Except for the vacuum leak on the engine side of the carbs going into the boots.  :-[
No amount of tightening(or lessening) or adjusting fixes it. I have been pinpointing the leaks by spraying electrical cleaner and watching for idle changes. I noticed the idle hanging while riding and did a quick spray over to check for leaks and was dismayed when i found them at the engine side boots. I would rather the leaks been from worn hoses considering the effort i spent putting these carbs on.

What are the tricks to getting these to seal up in this area? The boots are undamaged and like new

ducpainter

#1
October 29, 2015, 05:58:45 PM
I'd use a non hardening sealer like Hylomar.

http://www.hylomarsealant.com/

Feel free to do what you will.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


TheInsider

#2
October 29, 2015, 06:17:48 PM
Quote from: ducpainter on October 29, 2015, 05:58:45 PM


Feel free to do what you will.

Sounds kinda ominous ducpainter   :-X

ducpainter

#3
October 29, 2015, 06:25:55 PM
Quote from: TheInsider on October 29, 2015, 06:17:48 PM
Sounds kinda ominous ducpainter   :-X
In case you didn't know...

I am who I am.

I really don't care if you think what I say is ominous...

I'm fine with that. [thumbsup] ;D

Hylomar is a good product and should work for your issue...just sayin'.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


TheInsider

#4
October 29, 2015, 06:44:16 PM
Quote from: ducpainter on October 29, 2015, 06:25:55 PM
In case you didn't know...

I am who I am.

I really don't care if you think what I say is ominous...

I'm fine with that. [thumbsup] ;D

Hylomar is a good product and should work for your issue...just sayin'.
I'll try it, thanks for the tip. Only thing I ask is if it requires liberal use or sparingly

Speeddog

#5
October 29, 2015, 07:19:19 PM
Check that the carb necks on the engine side are securely threaded into the carbs.
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TheInsider

#6
October 29, 2015, 07:28:32 PM
Quote from: Speeddog on October 29, 2015, 07:19:19 PM
Check that the carb necks on the engine side are securely threaded into the carbs.

i hand tightened them when installing but i did put them in dry. I wish I had some Hylomar at the time, but i will be sure to do it this time

ducpainter

#7
October 30, 2015, 03:13:22 AM
Quote from: TheInsider on October 29, 2015, 06:44:16 PM
I'll try it, thanks for the tip. Only thing I ask is if it requires liberal use or sparingly
A thin even coat.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


TheInsider

#8
November 07, 2015, 03:11:07 PM
 Update:

I applied the Hylomar to the adapter threads, the adapter ends, and the inside of the boots. Still had some leaks at the adapter sections but I might have them knocked out for now. These are very hard to seal, the stock carbs never needed any kind of sealer.
It still has hanging idle though. It's odd because the hang occurs after using engine braking. If i cruise along at 4500 rpm for example and immediately close the throttle and pull in the clutch the rpms drop to idle like a rock. After engine braking for a few seconds then pulling in the clutch the idle will hang at 2000 for a few seconds everytime
I have the idle set at 1100 for testing this out, to prevent ignition advance hangs.

Am I missing something guys?  At my wits end almost...

ducpainter

#9
November 07, 2015, 03:36:17 PM
Drop the idle just a skosh more until it doesn't hang.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


TheInsider

#10
November 07, 2015, 04:46:27 PM
Quote from: ducpainter on November 07, 2015, 03:36:17 PM
Drop the idle just a skosh more until it doesn't hang.

Hmm, how low dare I go   :-\

ducpainter

#11
November 07, 2015, 04:57:47 PM
Quote from: TheInsider on November 07, 2015, 04:46:27 PM
Hmm, how low dare I go   :-\
As low as you need to without stalling.

When the vet installed my FCR's and he was giving me the basic rundown he told me to ignore the tach and adjust the idle so it didn't hang or stall.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


TheInsider

#12
November 07, 2015, 05:08:24 PM
Quote from: ducpainter on November 07, 2015, 04:57:47 PM
As low as you need to without stalling.

When the vet installed my FCR's and he was giving me the basic rundown he told me to ignore the tach and adjust the idle so it didn't hang or stall.

Gotcha... I'll mess with it tomorrow and see what happens.
Although... it does make corner entries easier with a hanging idle on engine braking. Like my own mini slipper clutch
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