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More fuel me... (Sport 1100 fuel issue)

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GuzziHero View Drop Down
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    Posted: 08 Jul 2017 at 16:11
I expected teething problems, so this is no real big.

The bike:
Sport 1100 with California gearbox and no electric fuel pumps.  Yep, I just have 2x 3-way fuel taps.

The problem:
Sometimes revs out fine, often won't.  If I run at low revs she chugs along fine, but as soon as I try to cruise at higher revs or go for a blast she spits, she sputters and stops.

When this happens, I let her sit a moment, choke on she carries on fine.  Putting choke on every now and then seems to reduce the issue.

Sometimes she ticks over at the 1000rpm I set the carbs to, sometimes she just dies at idle.

What I have done so far:
I suspected fuel cap breather blockage but thats all clear now.  I have blown through the breather in the tank, all is good.  Adjusted idle to 1000rpm.

When I MOT'd her yesterday I was told she is flooding on the right carb.  True enough, pulling the choke cable on the right carb does very little.  The left works fine.

What I suspect:
Stuck choke cable.

What I plan to do:
Clean carbs, replace floats and carb gaskets, replace choke cables.

---
Is there anything else I should look into to get this problem sorted?  She is so close to being a great bike, I know a little patience will sort this.

Is it possible the gravity feed fuel (no fuel pumps) could cause an issue?  If so, where could I get a fuel pump setup?

Thanks in advance of any help you can give.
Current: Griso 1100, Sport 1100, Zontes Panther 125.
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Dave P. View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 16:20
Check float needles and needle seats.Both are replaceable.

TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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GuzziHero View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziHero Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 16:28
Cheers, I'll be calling Gutsibits to get the parts I need on Monday.

What should I expect from float needles and seats?  Ensure there's no movement and clean them, or is there something else?  I've never worked on carbs if I'm honest.
Current: Griso 1100, Sport 1100, Zontes Panther 125.
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 16:47
The float needles are normally made of brass with a conical viton tip.
Examine the tip, preferably through a magnifying glass, there should be no wear ridges visible and the sides/flanks should not have worn concave.The seats are less lightly to be worn and it's often difficult to establish if indeed they are worn.I'd replace both needles and seats as a matter of course.Whilst you're at it check the condition of the choke plungers/pistons.If the viton inserts aren't in good nick replace them.

TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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GuzziHero View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziHero Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 16:52
I think I'll probably just get a carb overhaul kit.  For the price they cost on a 37000 mile bike, I may as well replace.
Current: Griso 1100, Sport 1100, Zontes Panther 125.
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 17:03
Are you sure the overhaul kit contains the needle and seat? Not just gaskets and O-rings.http://gutsibits.co.uk/pr/TheShop/index.php?f=e&Shnew=1&Model=1&ModelName=1100%20Sport%20V11&Cat=FUA&CatName=Fuel%20and%20Carburettors&sp

Third page in.

Edited by Dave P. - 08 Jul 2017 at 17:07

TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 17:32
https://www.ducatipaddy.com/page41.html

There you go.Third item from the bottom.

TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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GuzziHero View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziHero Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 17:32
You're right, it doesn't.  Ill get the needles and seats as well, cheers.
Current: Griso 1100, Sport 1100, Zontes Panther 125.
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johnno View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 18:08
Check your float is not sticking
GSXR1100 L ,Moto Guzzi 650tt/ntx.750xpa,t5 850.1100 sport,1100 sport corsa rider
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziHero Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 18:09
I suspect that, but with the choke cable on the right doing sweet fanny adams, I'm going to go all in and treat her to a full carb overhaul.  I'll probably take the affected carb apart tomorrow and see whats going on in there.
Current: Griso 1100, Sport 1100, Zontes Panther 125.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziHero Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 18:39
Oh on another note... I am getting oil dripping onto the generator cover.  This bike has K&N style cone filters on, can anyone tell me where the crankcase breather is routed?

On the V50 it went to a box under the front of the frame, the Cali it went into the frame I think.  I suspect its a bit clogged up and needs a scooping out.
Current: Griso 1100, Sport 1100, Zontes Panther 125.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ranton_rambler Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 20:19
Chris - carb kits often don't include choke plungers so you may need to order those separately too. Easy to fit though - on a loop frame bike they can be done in-situ but not sure about your bike.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote johnno Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 21:16
Into the frame under the tank, when I got mine it was thick with condensation
GSXR1100 L ,Moto Guzzi 650tt/ntx.750xpa,t5 850.1100 sport,1100 sport corsa rider
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziHero Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 21:25
Exactly what I thought, Johnno.  I thought it was odd getting oil there, then I saw there was white greasy type stuff in it.  Condensation + oil = what we used to call Hellmanns on the Vauxhall owners network! ;)
Current: Griso 1100, Sport 1100, Zontes Panther 125.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GuzziHero Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2017 at 23:40
I think I have found A problem.  Maybe not THE problem but here we go.

I have never worked on carbs before, so I'm running with scissors here.  I took the right hand carb off, and when I opened the throttle it promptly spat petrol in my eye.  Took off the left hand one, didn't do it.

I unscrewed the right hand choke cable and the spring inside was jammed right up in there, so I had to extract that to screw it back in.  It now moves freely.

Pulled the rubber cover off the throttle cable to the right hand carb and.. saw this. 



Now... thats not seated in there properly, I'm guessing this would over fuel that carb.  So I took the top off the carb, checked the slide and needle (looks A-OK), put it back on and rerouted the cranked shape of the throttle cable to the other side of the fuel line so it now sits properly inside the housing.

Question is: would this cable being trapped outside its fastening cause over fuelling?  Would it cause the choke on that side to appear that it wasn't working?  Would it also cause the carb to spit petrol in my eye when I twisted the throttle?  Or should I also look for a stuck float?
Current: Griso 1100, Sport 1100, Zontes Panther 125.
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