SOHC.co.uk Forums > CB500/550
Wont exceed 4,500 rpm then stalls and wont restart - on route to MOT
Bryanj:
Steve, Honda relied on the gauze in the tap as the tanks were new and hadn't had 25 years of dirty petrol in them so it didnt need to stop much crud or rust. I agree the small ones can clog fairly easy but the last batch i had you simply had tor reverse the flow into a can for a short time and it flushed said crap back out
florence:
My carbs always clogged until I got fuel filters. Annoyingly, the needle valve would get gritty and the carbs would flood.
If you are not too worried about looks, I find the large car ones are the best because they have a good flow rate and they are cheap, so periodically, when they look really dirty, I throw them away and fit new ones.
On the subject of compression; a friend had a 550 many years ago (1987-ish) which he bought as a non runner. It had been standing for a while in the previous owners garage. When my friend got the bike going he took it for a blast and was a little too enthusiastic with the throttle. What he didn't realise, until I had to strip the engine for him, was the piston rings had become gummed up with old oil during its 'rest' and when he thrashed it they all cracked. However, I fitted new rings for him and it ran a treat after that.
totty:
Maybe mine has a self preservation device, I had to cover 150 miles before it allowed me to ride enthusiastically.
The filter I've fitted is rather small but it's what looks like a sintered metal rather than paper element. I've found these flow very well for a small size and don't block easily, they probably don't filter all that well either but will hopefully catch anything big enough to block a jet.
totty:
I found that the feed to the coils had a corroded connection, after cleaning that up and syncing the carbs I've only had a short test ride. It feels allot better but it doesn't pull cleanly from 5,000 up over although in 4th or lower it will still rev to at least 8,000, in 5th it runs out of steam at 80mph.
The fuel filter is still clean.
florence:
When you say synced the carbs, I assume you mean with vacuum guages?
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