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18-04-2023, 06:40 PM | #1 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,029
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Actually is the choke coming off both carbs fully? It was a common issues with Dell Orto the plungers would not all go up and down equally/fully.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
18-04-2023, 07:33 PM | #2 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,849
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This could be a float height/operation issue, or perforated diaphragm.
Another thing to check would be the triangular grey plastic boxes that sit in the frame either side. It is important that these are present and that the relevant pipes are correctly placed in them and are in good condition, free of splits and leaks. The boxes provide a place to draw still air from for the pipes, but I'm damned if I can remember what those pipes do and why they need still air except that if they don't it will run rough, though probably more at higher speeds than slow and definitely worse in windy weather.
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18-04-2023, 08:39 PM | #3 | |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,029
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Quote:
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
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19-04-2023, 06:03 AM | #4 | ||
Registered User
Join Date: Sep 2022
Location: Little Haywood
Bike: M750
Posts: 68
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Quote:
Quote:
So this could be at least part of the problem, although the worst problems in my bike's running are at low speed.... But that is definitely something that I must correct when I put it all back together. But thanks for the reply Last edited by Brian.; 19-04-2023 at 06:12 AM.. |
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07-07-2023, 02:28 PM | #5 |
Registered User
Join Date: May 2019
Location: Gloucester
Bike: M600
Posts: 32
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I had a similar issue with my M600 - very poor running at small throttle openings, running rich, sooting plugs, jerky running, only happy on big throttle openings, exactly what you describe.
I got very very good at taking the carbs off/ and back on again. I cleaned everything (several times), set everything according to the book, fitted new float kits, diaphragms were good - did it improve? No. I won't bore you with the whole saga but in the end I bought a used set of carbs to try them, but they weren't in any fit state to use, so I kept them for spares. What was immediately apparent when comparing parts from both were the needles - the needles from the spare carbs were much thicker (visibly) than the ones from my carbs, totally different in fact. I did a load of research and it turned out the the numpty who owned it before me (I bought it cheap it as a non runner) had fitted dynojet needles but left the original Mikuni needle jets in....Doh. Fuel was pouring through it as soon as you touched the throttle! I fitted the std needles from the spare carbs and, hey presto, smooth running was achieved. That was a couple of years ago now and the bike has run great since, all I have done recently is weaken the mixture a bit on the pilots as it was running a bit rich on the smallest throttle openings, you could tell by minor fluffing and snatching low down - now, all sorted again. And yes, the grey boxes are important as they allow the vacuum part of the carb, that control the diaphrams, to draw still air when the bike is going. If the pipes are left open to the elements, the diaphragms can go all over the place and upset it even more! Iridium plugs have helped prevent plug fouling too. Hope this helps, Jim Last edited by tridentperu; 07-07-2023 at 02:37 PM.. |
19-04-2023, 05:43 AM | #6 | |
Registered User
Join Date: Sep 2022
Location: Little Haywood
Bike: M750
Posts: 68
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Quote:
Thanks for the suggestion though. Brian. |
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