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Run away throttle?

Started by Porsche Monkey, February 08, 2012, 06:20:23 PM

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Porsche Monkey

#15
March 13, 2012, 08:02:33 PM
I used brake cleaner. I'm not allowed around acetylene anymore.
Quote from: bobspapa on July 18, 2009, 04:40:31 PM
if I had a vagina...I'd never leave the house

Howie

#16
March 13, 2012, 10:30:49 PM
Other than for test purposes I would not chuck that little rubber shneckle between the cap and tank.  The reason is if you need to raise the tank when full fuel will either not come out of the cap or dribble with the shneckle in place (assuming the check valve works).  Without, gas will flow freely. 

Checking for vacuum leaks when hot is a good idea.  It doesn't matter if you use something combustible or not, you are just looking for a change in speed.

ducpainter

#17
March 14, 2012, 04:21:10 AM
Quote from: howie on March 13, 2012, 10:30:49 PM
Other than for test purposes I would not chuck that little rubber shneckle between the cap and tank.  The reason is if you need to raise the tank when full fuel will either not come out of the cap or dribble with the shneckle in place (assuming the check valve works).  Without, gas will flow freely. 

Checking for vacuum leaks when hot is a good idea.  It doesn't matter if you use something combustible or not, you are just looking for a change in speed.
Have to disagree Howie.

If the vent flaps in the cap are working correctly no fuel should come out
"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."


Porsche Monkey

#18
March 14, 2012, 05:27:31 AM
No idea on the gurgling though huh?  It's the only thing that seems out of place. It still does backfire and sometimes as its just idling. The coughing pretty much went away when I re-synched the carbs. Now it does it every once in a while.
Quote from: bobspapa on July 18, 2009, 04:40:31 PM
if I had a vagina...I'd never leave the house

Howie

#19
March 14, 2012, 07:16:56 AM
Quote from: ducpainter on March 14, 2012, 04:21:10 AM
Have to disagree Howie.

If the vent flaps in the cap are working correctly no fuel should come out

Did on mine.  Doesn't with the shneckle in place.  Maybe just coincidence.  I'll have to revisit the vent design.

Quote from: Porsche Monkey on March 14, 2012, 05:27:31 AM
No idea on the gurgling though huh?  It's the only thing that seems out of place. It still does backfire and sometimes as its just idling. The coughing pretty much went away when I re-synched the carbs. Now it does it every once in a while.

Chances are the gurgling is coming from the check valve in the cap.  If you are not developing vacuum I would not worry about it.  You can take the cap apart and check the vent valve.  If I remember correctly it is a spring or two and a couple of check balls.  The valve can be gummed up over the years. 

Maybe it is time to go through those carbs.

Porsche Monkey

#20
March 14, 2012, 07:19:22 AM
Been through them twice.
Quote from: bobspapa on July 18, 2009, 04:40:31 PM
if I had a vagina...I'd never leave the house

Howie

#21
March 14, 2012, 07:24:55 AM
What are you using to synch the throttles?

Porsche Monkey

#22
March 14, 2012, 07:28:47 AM
Quote from: bobspapa on July 18, 2009, 04:40:31 PM
if I had a vagina...I'd never leave the house

ducpainter

#23
March 14, 2012, 01:00:33 PM
Quote from: Porsche Monkey on March 14, 2012, 07:28:47 AM
one of these  http://www.jbugs.com/product/7034-11.html
The problem with those is they affect the running of the motor when they're stuffed into the carb mouth.

Sticks that attach to the intake work better IMO

Quote from: howie on March 14, 2012, 07:16:56 AM
Did on mine.  Doesn't with the shneckle in place.  Maybe just coincidence.  I'll have to revisit the vent design.

Chances are the gurgling is coming from the check valve in the cap.  If you are not developing vacuum I would not worry about it.  You can take the cap apart and check the vent valve.  If I remember correctly it is a spring or two and a couple of check balls.  The valve can be gummed up over the years. 

Maybe it is time to go through those carbs. 

It would leak out the drain tube underneath unless the piton blocked the vent hole.
"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."


Howie

#24
March 14, 2012, 10:01:02 PM
Quote from: ducpainter on March 14, 2012, 01:00:33 PM
The problem with those is they affect the running of the motor when they're stuffed into the carb mouth.

Sticks that attach to the intake work better IMO
I agree.  Plus you can see what is going on with both carbs at the same time.  Even two matched vacuum gauges would be better.

It would leak out the drain tube underneath unless the piton blocked the vent hole.

Yep, I looked.  Probably coincidence.  Had to be debris on the gasket.

Porsche Monkey

#25
March 15, 2012, 05:48:25 AM
Started it up last night and it was misfiring real bad on the horizontal cylinder. Think my new plugs may have fouled out. I'm just gonna buy another pair instead of cleaning them. I'll let y'all know what happens.
Quote from: bobspapa on July 18, 2009, 04:40:31 PM
if I had a vagina...I'd never leave the house

ducpainter

#26
March 15, 2012, 06:04:02 AM
Quote from: Porsche Monkey on March 15, 2012, 05:48:25 AM
Started it up last night and it was misfiring real bad on the horizontal cylinder. Think my new plugs may have fouled out. I'm just gonna buy another pair instead of cleaning them. I'll let y'all know what happens.
How old are your needle jets?
"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."


Porsche Monkey

#27
March 15, 2012, 06:08:03 AM
Theyre the factory pro ones and show very little wear. But they have around 20k on them. The jets don't appear to be ovaled at all. Probably should just replace em and be done with it.
Quote from: bobspapa on July 18, 2009, 04:40:31 PM
if I had a vagina...I'd never leave the house

ducpainter

#28
March 15, 2012, 06:15:32 AM
Quote from: Porsche Monkey on March 15, 2012, 06:08:03 AM
Theyre the factory pro ones and show very little wear. But they have around 20k on them. The jets don't appear to be ovaled at all. Probably should just replace em and be done with it.
If you've been running the Ti needles I would.

It doesn't take much to affect running
"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."


Porsche Monkey

#29
March 15, 2012, 06:19:53 AM
Ill get some ordered then and try that.  While I'm waiting for them to come in Ill probably go down a notch on them and see if it changes anything. 
Quote from: bobspapa on July 18, 2009, 04:40:31 PM
if I had a vagina...I'd never leave the house

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