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jaffa90 |
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jaffa90 World Chat Champion
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A100man |
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A100man World Chat Champion
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Posted: 12:01 - 26 Feb 2024 Post subject: |
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Nobby the Bastard wrote: | from the days of cdi onwards (basically electronic ignition) they became quite robust and due to the fact there are no moving parts (or even repositionable parts) they tend to either work or not work, and very little likelihood of your problem being ignition related. |
Agreed - if it works well up to 5k it should also worki higher up therange. Issues I've had with similar fou pot UJMs have been with carbs. All along your's has sounded to me like it struggles when the main jets come on line - whats the exhaust smoke like? black, stinking of fuel by chance? ____________________ Now: A100, GT250A, XJ598, FZ750
Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600 |
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jeffyjeff |
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jeffyjeff World Chat Champion
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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jeffyjeff |
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jeffyjeff World Chat Champion
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A100man |
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A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
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Posted: 11:44 - 27 Feb 2024 Post subject: |
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jeffyjeff wrote: | To my knowledge, carburetor main jet operation is dependent on air flow, not engine speed. At no load (transmission in neutral and throttle pinned), rpms should bounce off the rev limiter without engaging the main jets. |
So at no load, not enough mixture is being pulled through for the vacuum to pull-up the needle, even thoug it's revving it's tits off - Fair comment..
..although it could still mean the other jets/enrichment are delivering too much fuel I guess..
Do we know what the plugs look like? ____________________ Now: A100, GT250A, XJ598, FZ750
Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600 |
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jeffyjeff |
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jeffyjeff World Chat Champion
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A100man |
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A100man World Chat Champion
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 20:32 - 27 Feb 2024 Post subject: |
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I've seen someone battling with this kind of issue on a drag bike. Vibration at a certain revs was causing a poor connection in an electrical connector. Only happened at the one RPM just happened to be a resonant frequency for that part.
Put a volt meter on the coil power lead and see what it does when you hit the RPM where your trouble starts. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Landyman |
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Landyman Derestricted Danger
Joined: 20 Feb 2024 Karma :
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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A100man |
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A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
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Posted: 23:05 - 27 Feb 2024 Post subject: |
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Landyman wrote: | Hello Again Everyone.
This is what to many of you will be an obvious question but, I want your answer.
I am replacing the O-Rings in the carb Manifold boots, do I bolt them together with dry surfaces or would you recommend a little smear of Hylomar?
Kind Regards |
I tend to use silicone grease on o-rings..
..but there's a fair chance that's wrong. ____________________ Now: A100, GT250A, XJ598, FZ750
Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600 |
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 00:45 - 28 Feb 2024 Post subject: |
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I generally don't use anything more than a smear of oil or grease to help the o-ring squish down evenly. They should seal unless the mating surface is damaged. I put a tiny wipe of red rubber grease on carb rubbers to assist with fitting.
I use permabond A136 on gasketed manifolds. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Landyman |
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Landyman Derestricted Danger
Joined: 20 Feb 2024 Karma :
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that_impulse_guy |
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that_impulse_guy Nitrous Nuisance
Joined: 07 Mar 2023 Karma :
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Posted: 09:59 - 28 Feb 2024 Post subject: |
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hylomar never dries.
never.
so if it gets sucked in, it'll be around forever....maybe it'll block a jet...maybe a oil feed.
maybe it just goes and sits in the oil filter. ____________________ Gone: Yamaha DT50lc, Suzuki DR500, Suzuki A100, Kawasaki z250ltd, RD350YPVS, Suzuki DR Big, Kawasaki AR125, Kawasaki KMX200, Suzuki GS1000S, Katana 1100, GS550M, Suzuki RGV250
Now: Suzuki GSX400X, Suzuki RF900R, NS400R |
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Pete. |
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Pete. Super Spammer
Joined: 22 Aug 2006 Karma :
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Posted: 11:56 - 28 Feb 2024 Post subject: |
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Bike engines will rev to the moon if you squirt petrol into the intakes with no carbs fitted. Spray some go juice down its throat with the carbs off and if it still falls over at 5k your problem is not fuelling. ____________________ a.k.a 'Geri'
132.9mph off and walked away. Gear is good, gear is good, gear is very very good |
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Landyman |
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Landyman Derestricted Danger
Joined: 20 Feb 2024 Karma :
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Posted: 18:03 - 03 Mar 2024 Post subject: |
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And Finally.
Just to keep you up to speed, the problem has been sorted. The whole issue has taken time, patience, a little money and repeated strip, fettle, rebuild and test, until it was fixed.
Jobs done finalised with removing the inlet manifold boots, removing the knackered O-Rings, cleaning each boot till they were perfect before conditioning with red rubber grease and fitting new O-Rings. Replacing the main jets with new, replacing the pilot air jets with new, re-setting the floats with the aid of a digital vernia and polishing all the surfaces.
Success! Starts, ticks over, revs and runs like a Swiss watch.
Thank You Everybody for your advice, ideas, guidance and support, it has all been helpful.
Kind Regards. |
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A100man |
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A100man World Chat Champion
Joined: 19 Aug 2013 Karma :
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Posted: 14:38 - 04 Mar 2024 Post subject: |
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Landyman wrote: | And Finally.
Just to keep you up to speed, the problem has been sorted. The whole issue has taken time, patience, a little money and repeated strip, fettle, rebuild and test, until it was fixed.
Jobs done finalised with removing the inlet manifold boots, removing the knackered O-Rings, cleaning each boot till they were perfect before conditioning with red rubber grease and fitting new O-Rings. Replacing the main jets with new, replacing the pilot air jets with new, re-setting the floats with the aid of a digital vernia and polishing all the surfaces.
Success! Starts, ticks over, revs and runs like a Swiss watch.
Thank You Everybody for your advice, ideas, guidance and support, it has all been helpful.
Kind Regards. |
Cool, so it was fuel intake, but we're not quite sure what, specifically.. ____________________ Now: A100, GT250A, XJ598, FZ750
Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600 |
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jeffyjeff |
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jeffyjeff World Chat Champion
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