SOHC.co.uk Forums > CB500/550

CB500 Four - engine cuts off in idle

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Sesman:
Or just ride it….

Oddjob:
If he’s so legendary why have we never heard of him. Seriously, one person says something and you latch onto it as gospel.

There is no race to the bottom Peter, it’s about setting the engine up to what the manufacturer recommended. Increasing the tickover to compensate for faults or problems in the engine is like sticking your fingers in your ears because you don’t like listening to something, ultimately it’s pointless. The problem here is that the idle screw isn’t the answer, fixing what’s causing the problem is the answer.

Those carbs have clearly been apart and whoever did them clearly didn’t know what they were doing.

deltarider:
@ Siloxious Just to satisfy my curiosity, when you set the timing of the ignition, did you first check the breakerpoints gaps?
As far as the carbs.
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.
2. To be sure, all four carbs receive the same amount of fuel, read this: http://forums.sohc4.net/index.php/topic,185754.msg2151647.html#msg2151647 When you do this test, realise it takes quite some time before the bowl is filled completely.

deltarider:

--- Quote from: Oddjob on November 03, 2023, 10:36:44 PM ---If he’s so legendary why have we never heard of him.
--- End quote ---
   Oh Sir, there's a whole continent east of you.;D

--- Quote from: Oddjob on November 03, 2023, 10:36:44 PM ---Seriously, one person says something and you latch onto it as gospel.
--- End quote ---
Why such an accusation, Oddjob? Should we latch onto what you say instead as a gospel? Hertweck has lead Das Motorrad for years. You may not know this, but it is the biggest and best motorcyle magazine in Europe and maybe even the world. In the 70s it was spelled by Honda. Many grew up with Hertweck's publications. He is not the only one who prefers a somewhat raised idle...
You seem to forget that I had mine idle nicely at a true 800 rpm, but was advised to increase it to 1000 or 1100 by someone who knew much more than me. I've learned a lot from him. Why would I deviate from what he and Honda says and possibly end up with fouled plugs? I'd rather stay on the safe side. I'm not in the category of those who prefer sitting in a deckchair next to their bike listening to an idling engine over riding it. Youtube has lots of vids where bikes idle for too long. It's generally considered good advice (and certainly no gospel) to idle as short as possible and start riding. That's what the bike is for.

Oddjob:
I didn't say follow my advise, I said HONDA said it, as they made the bike I think they know more about it than anyone else.

Never heard of Das Motorrad and TBH I don't take advise from magazines as they have an agenda, they need to sell advertising space so they say whoever is paying them to say generally.

How can I forget it idled at 800, you've never mentioned to my knowledge, plus I didn't say at anytime to idle the engine at that speed, just that if the engine can idle at that speed it's a good indication of the state of the engine, mine would but mine idled at 1000 normally. 1000-1100 is close enough to what Honda specified, anymore is not necessary IMO.

The rest of your reply is just off topic so I won't bother answered that. 

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