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Mikuni carb question - 00 M750

Started by citizin, September 11, 2010, 09:47:36 AM

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citizin

#15
September 11, 2010, 03:06:27 PM
They look like they did when I put them on this morning, nice and clean.

ducpainter

#16
September 11, 2010, 03:09:48 PM
Try squirting a little fuel in the carbs...an oil can works well.

If it fires add some more to keep it running.

Maybe your pump is the problem.
"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."


citizin

#17
September 11, 2010, 03:17:24 PM
I will have to do that tomorrow - it's getting dark here and the girlfriend has dinner on the stove.

So straight fuel down past the throttle? Would that not be the same as spraying starter fluid.

ducpainter

#18
September 11, 2010, 03:52:12 PM
Quote from: citizin on September 11, 2010, 03:17:24 PM
I will have to do that tomorrow - it's getting dark here and the girlfriend has dinner on the stove.

So straight fuel down past the throttle? Would that not be the same as spraying starter fluid.
Fuel is safer for the engine.
"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."


citizin

#19
September 11, 2010, 04:06:57 PM
Gotcha -

Thanks for the help dp, koko - sorry if I ask a lot of questions. I just want to be knowledgeable about my Ducati and how things work so maybe one day I won't have to always come on here and ask!

Howie

#20
September 11, 2010, 05:03:37 PM Last Edit: September 11, 2010, 05:05:38 PM by howie
If you have a fairly full thank you can bypass the fuel pump to rule that out.  It could be clogged from the water issue.  Same with the vacuum fuel cut off.  You may also have your floats set way to low or needles and seats could be stuck closed.  And, as humorless keeps saying, new plugs don't hurt.

Oh, check that the fuel lines are not kinked or collapsed.

citizin

#21
September 11, 2010, 05:18:53 PM
I'm going to try to pump bypass tomorrow. I'm going to get a friend to check the float levels.
None of the lines are kinked or collapsed, I think.
And I put new plugs on it today, again.

Let's say the needles are getting stuck - what would remedy that?

ducpainter

#22
September 11, 2010, 05:25:27 PM
Quote from: citizin on September 11, 2010, 05:18:53 PM
<snip>
Let's say the needles are getting stuck - what would remedy that?
Cleaning...but you already did that.
"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."


citizin

#23
September 12, 2010, 06:25:50 AM
Fuel Pump

I pulled the line coming from the pump to the carbs - I got a steady stream of gas when the engine was off and then the stream "pulsed" along with the engine as I cranked it.

Carb Test

I opened up the throttle slides so that the needle was lifted out of the emulsion tubes. I put it in gear and opened up the throttle (with it on a rear stand) and cranked the engine. Didn't notice any fuel coming from the emulsion tube.

ducpainter

#24
September 12, 2010, 06:34:08 AM
Quote from: citizin on September 12, 2010, 06:25:50 AM
Fuel Pump

I pulled the line coming from the pump to the carbs - I got a steady stream of gas when the engine was off and then the stream "pulsed" along with the engine as I cranked it.

Carb Test

I opened up the throttle slides so that the needle was lifted out of the emulsion tubes. I put it in gear and opened up the throttle (with it on a rear stand) and cranked the engine. Didn't notice any fuel coming from the emulsion tube.

The fuel pump operation sounds fine...for starting at least.

There isn't necessarily proper vacuum from the engine at cranking to pull fuel through the emulsion tubes.

Did you try spraying/dripping some fuel in the mouth of the carb to see if it fires?
"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."


citizin

#25
September 12, 2010, 07:21:31 AM
We've got the engine firing at full choke, but then it cuts off.

We've got no firing in gear....

Floats are off - not letting enough gas into the float bowls....

ducpainter

#26
September 12, 2010, 07:22:23 AM
Quote from: citizin on September 12, 2010, 07:21:31 AM
We've got the engine firing at full choke, but then it cuts off.

We've got no firing in gear....

Floats are off - not letting enough gas into the float bowls....
Set the float level to 14mm.
"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."


citizin

#27
September 12, 2010, 09:16:55 AM
I think I've got them set, but I'm slightly unsure and don't want to have to pull them off and try again. I checked the Ducati Suite site on how to do this, but it was unclear on some stuff and the pics are too small to see anything.

Setting them upside down on a level surface so the float bowl is now the top, you measure the distance from the flat metal rim of the open float bowl to the top of the rectangular float that is exposed. You measure the distance that said float travels "UP", meaning the fuel metering is open and letting fuel into the bowl.

???

ducpainter

#28
September 12, 2010, 10:32:37 AM Last Edit: September 12, 2010, 10:47:37 AM by humorless dp
Quote from: citizin on September 12, 2010, 09:16:55 AM
I think I've got them set, but I'm slightly unsure and don't want to have to pull them off and try again. I checked the Ducati Suite site on how to do this, but it was unclear on some stuff and the pics are too small to see anything.

Setting them upside down on a level surface so the float bowl is now the top, you measure the distance from the flat metal rim of the open float bowl to the top of the rectangular float that is exposed. You measure the distance that said float travels "UP", meaning the fuel metering is open and letting fuel into the bowl.

???
You have most of it right.

Measure the distance with the float just sitting on the needle by it's own weight. You don't move anything to measure it. That will mean the needle is closed at 14mm.

edit...

good photo here....http://www.factorypro.com/tech_tuning_procedures/tuning_float_height_adj_procedure.html
"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."


citizin

#29
September 12, 2010, 11:06:15 AM
Quote from: humorless dp on September 12, 2010, 10:32:37 AM

Measure the distance with the float just sitting on the needle by it's own weight. You don't move anything to measure it. That will mean the needle is closed at 14mm.


dp = awesomeness
That is the best explanation in such a concise set of words.

You just helped me get my float levels set. I would buy you a beer right now.

[beer]
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