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Topics - Siloxious
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« on: April 13, 2024, 07:44:37 PM »
Hi everyone.
My right hand upper exhaust pipe has some rather big holes in it and thus, I’d like to replace it (or alteratively, if someone has experience with patching large holes, let me know).
Does anyone know where I can buy separate pipes of the exhaust system (its for a K1)? I don’t want to buy a set of four as the other three are still good. Ebay doesn’t give good results, as the two pipes I’ve found there are quite dented or rusted…
Thanks in advance!
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« on: April 13, 2024, 10:41:28 AM »
Hi everyone! I'm back here again as I'm a bit lost.
At the suggestion of one of you, I have cleaned my carbs and assembled them according to Motormac. I've really (really) cleaned them well.
My original problem was that the engine cut of in idle and generally didn't idle well. Also, the engine made a ticking noise. When I touched the exhaust pipes, I felt that all cylinders were hot, but cylinder 4 was I bit colder than the other three. So I thought that this ticking noise could be due to the cylinder not firing properly due to a clogged idle circuit. You guys thought the same, and thus I cleaned the carbs.
I hoped my problems would be over after the reassembly of the carbs. I have put in new brass jets. The engine idles a bit better, but there are still three problems.
1) The exhaust from cylinder 4 is still a bit colder than the other three. This could be connected to problem 2. Because I have really cleaned the carbs well, I would be surprised this is still a carb problem. Although, I don't exclude the carbs completely.
2) The ticking noise is still present in the engine, it is especially noticable at low rpm. In a video from a couple of months ago, it can be observed. <https://youtube.com/shorts/NGVH7g6JEZg?si=RLU1ZoAWtI8Ji8E2>
3) When I open the choke after starting, the revs shoot up to the 6000 rpm range. I suppose this could be a carb problem.
Does anyone have an idea where these problems come from? I have already checked the ignition timing and valve clearances. Can anyone give me suggestions to what it is? (I'm really hoping something isn't loose in cylinder 4, could this be the case?)
Thanks in advance!
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« on: March 24, 2024, 02:40:25 PM »
Hello everyone, Deltarider gave me the following advice about fuel lines:
1.Verify fuellines have the right dimensions
The CB500/550s are very sensitive for a proper fuelflow route, so let us first establish whether everything is standard or not.The correct dimensions for the fuellines are: for the CB500 and earlier CB550s: 18 and 30 cm length for the models with the bowltype petcock and 17 and 28 cm for models that have the newer style petcock. Do not be tempted to have them longer. For the tube that supplies carbs 3+4, use the soft metal clamp in the middle front side as shown in the pic (btw, horizontal is good enough) for proper routing. Ideal inside ⌀ of the fuel lines is 5,5 mm. Outside ⌀ will be around 10mm. Have this and the lines will not kink. Abstain from extra inline filters. Some have been lucky with them, but my experience is they can't be trusted. Often it isn't that filter itself, but the rerouting of the fuel line that - sometimes intermittent - impedes a proper delivery of the gas.
I am living in Belgium, and I've been looking everywhere for these dimensions, but I can not find them.
Can I also use inner diameter 5mm and outside 10mm? (or for example inner diameter 6mm?) Or does this impede the fuel flow too much?
Thanks in advance!
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« on: March 22, 2024, 11:21:42 AM »
Hey everyone,
I have a crack in one of my valve tappet covers. Coincidentally, this cover is placed on a cylinder that is misfiring (but this could also be due to a clogged idle circuit in the carbs - I'm adressing that now).
I was wondering if this broken valve tappet cover has any influence on the performance of the engine. Of course I understand that oil could leak out of the engine because of this crack, but are there any other influences? I don't know if the camshaft and valve area of the engine should be at a certain pressure and this crack prevents that, but that would have an influence on all cylinders...
Does anyone have an opinion about this?
Kind regards
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« on: November 02, 2023, 01:44:54 PM »
Hello everyone!
I had an awesome weekend, I was finally able to get my CB500 Four running! After a year and a half of work on the bike, it came to life. While wrestling with the ignition, I noticed that the previous owner had installed the cam of the ignition advance 180 degrees wrong. After fixing this, the engine came to life with only one kick with the kickstarter. Now, another chapter of the restoration begins!
The engine starts brilliantly, no problems with starting and runs on all four cylinders (the exhausts become hot). However, it cuts off when idling. When I use the throttle, the engine reacts. But beneath 2000 rpm, it begins to sputter and beneath 1000 rpm, it cuts off. It just doesn’t idle at all. I noticed that cylinders 2 and 3 are hotter than 1 and 4. Would anyone know what the problem could be?
The next thing on my list is doing a compression test of the cylinders as I’ve not gotten around to it yet. And if I can manage to get the engine to idle, I’d like to do a carburetor synchronisation.
Overall, it was a good weekend!
Cheers!
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« on: October 14, 2023, 12:32:02 PM »
Hello everyone
I'm currently restoring the fuel tank (inside). I filled the whole tank with white vinegar and let it sit for 48 hours. The results are quite good. But now I need to treat the aluminium against corrosion. I plan on using WD-40 to coat the inside of the tank (I plan on using a lot of WD-40). After soaking for a bit, I'll fill the tank again with fuel (I think the best fuel for the CB500 Four is E95?).
Is the WD-40 a good protection against corrosion?
Is this the right fuel that I'll be using?
Thanks in advance!
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« on: September 08, 2023, 04:58:27 PM »
Hello
Just now, an inner thread of the exhaust stud whole in the engine has snapped. I can move the exhaust stud freely in this hole. This sucks...
My idea was to tap a new M8 thread in the engine and try to fasten the exhaust pipe with a M8 bolt.
Does anyone have any experience with this? Do you think this would be a good idea or do you have alternatives? I already used loctite but it didn't work...
Thanks in advance!
8
« on: June 29, 2023, 10:00:52 PM »
Hello everyone!
I've recently started cleaning the original exhaust pipes of my CB 500 Four. I have noticed there is something loose in one pipe.
It sounds metallic when I shake the pipe and I fear it's a loose baffle. When shaking, a small metal piece also fell out.
Does anyone know if it is indeed a loose baffle? Can I repair this one way or another?
Thanks in advance!
9
« on: April 28, 2023, 12:59:48 PM »
Hello everyone!
As I'm restoring my CB 500 Four K1 - General Export, I've ran into a problem with the ignition. The spark plugs connected to one of the two coils don't give spark (the coil connected to the blue wire).
I know the problem isn't the ignition coil, it's HT leads and spark plug caps, because I've recently bought new ones and when I switch the blue and yellow wires of the coils, the one that was faulty before now gives spark and the other one doesn't anymore.
The problem can also not be due to bad wires.
I've checked the connection between the blue wire and the ground and they are connected on the right time of the ignition cycle.
I've also switched the wire that gives power to the coils (the black - white wire) and it still doesn't work.
The problem is also not related to faulty spark plugs. They're brand knew and if I switch them, the problem isn't resolved.
Does anyone have any experience with this kind of problem or have a suggestion where I can look for the problem?
Thanks in advance!
You can find the wiring diagram down below (the bike is wired like a K3).
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« on: March 17, 2023, 06:16:03 PM »
Hi, everyone.
I have a CB 500 Four K1 - General Export and I've recently bought my seat.
The problem is that the small cilindrical hinges on the frame itself (where the seat hinge bars go in) have been cut off by the previous owner. This means that the left side of the seat isn't supported well and that the seat won't rotate around these hinges when the lock is turned open.
Does anyone have any experience with this? Is there an easy way to make a part that replaces this and I'll be able to open my seat?
Thanks in advance!
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« on: December 31, 2022, 04:26:18 PM »
Hello everyone Does anyone know where to buy/find these following parts? Thanks in advance!
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« on: December 24, 2022, 11:07:56 AM »
Hello
Does anyone have any tips regarding buying a buddyseat for my CB500 Four K1 - General Export in Europe?
I've been searching for a long time and if I don't find one, I'll have to buy a single seat. The buddyseat obviously looks better...
Thanks!
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