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28-06-2020, 04:20 PM | #1 |
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M900 Carb Leak
Hi All,
Just fired up my 1993 M900 for the first time since restoring. It jumped into life almost immediately All is good except I seem to have a fuel leak at the carbs. The only things I did to them when they were off is open one of the black plastic covers, and I also removed two screws to zinc plate the throttle cable mount. I've also replaced all the lines but I cant see that being the problem. Do these carbs have common areas of leaking? If so, anyone know where I can source some seals/gaskets locally? Cheers Last edited by Ross090; 28-06-2020 at 04:25 PM.. |
28-06-2020, 04:28 PM | #2 | |
aka Phil
Join Date: Nov 2005
Location: derry
Bike: M900
Posts: 376
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Quote:
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28-06-2020, 04:39 PM | #3 |
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Its quite hard to tell with everything else attached to the bike so I think I will be stripping it down again soon. It appears to be from the left hand carb, but that could be just because its sitting lower when on the sidestand.
It doesnt look like its from the overflow outlets as I have them routed down past the engine, and the tubes were on quite nice and firm there. Is it possible to test for leaks when they're off the bike and it isnt running or does it need fuel pressure? |
28-06-2020, 06:41 PM | #4 |
aka Phil
Join Date: Nov 2005
Location: derry
Bike: M900
Posts: 376
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Shouldn't be any prob checking them off the bike. The fuel isn't pressurised in the carbs.
It would be useful if you were able to see where it was coming from on the bike though in case it's one of the supply line connections.
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28-06-2020, 08:06 PM | #5 |
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Thank you!
I'll take a good look at things when I remove the airbox, hopefully that'll show me if its lines or carbs. I've found some gaskets on ebay, but they're pricey and a full kit which isn't really what I want. I'll be calling Ducati tomorrow, but I doubt it's something they stock. Last edited by Ross090; 28-06-2020 at 08:10 PM.. |
29-06-2020, 12:21 AM | #6 |
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Join Date: Jul 2008
Location: guildford
Bike: M1200R
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to answer your question "do these carbs have common areas of leaking?" - apart from the norm concerning needle valve maladies, they do have one other and that is the float chamber drain plug/screw. It uses a very shallow taper as a means of sealing and this means that they need tightening very carefully as it's only too easy to crack the tapered seat of the bowl casting if over-enthusiastic tightening applied. Hopefully your leak is the more common needle valve failing to seal type as a result of standing etc. Careful examination of float bowl interior will usually be visible if taper seat fractured if you need to check.
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29-06-2020, 11:48 AM | #7 |
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Thanks for the info.
I have some seals coming from Ducati, I will be sure to check the casting for any cracks when I have the carbs off the bike again. Hopefully an easy and cheap fix though! |
07-07-2020, 06:34 PM | #8 |
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Looks like it was one of the bowl gaskets afterall
..what a job that was! |
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