SOHC.co.uk Forums > CB500/550

Wont exceed 4,500 rpm then stalls and wont restart - on route to MOT

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totty:
I set the tappets when I first bought it 350 miles ago, could they cause these symptoms?

The Boyer system I've fitted is "KIT00289 Micropower ignition system for Honda "4" S.O.H.C. Motorcycles". Fitting is as you describe but it does not tell you to grind off the raised bits, timing instructions tell you to line it up the magnets with the posts at TDC then time with a strobe to max timing marks at 4,500rpm. I've ordered a new strobe as mine just wasn't clear enough and kept giving me shocks, but I'm not convinced that setting the timing will fix it.

matthewmosse:
I seem to recall I had a similar problem before sidelining the sidecar outfit, fraid I can't say I resolved it though. Like you I tried swapping to boyer ignition but no success so problem must lie elsewhere was my conclusion. Tried another set of carbs? That was my next line of attack when I get the time.

totty:
I don't have another set of carbs to try, I might have to lookout for a set if setting the timing doesn't sort it. I'm reluctant to throw more money at the bike though, I keep saying I'll never buy another vehicle that isn't already in regular use as they're always a pain to get sorted but I keep buying them.

Yoshi823:
If only you lived closer...

metalcatfish:
Had these symptoms once, was caused by multiple problems any of which can cause similar symptoms.
Engine kill switch, these are rubbish and dont stand up to the high loads that electronic ignition creates. Electronic ignition fires all 4 plugs simultaneously hence doubling the duty on those silly little switches. Bypass it or replace with something else. Ignition switches, also rubbish but not so bad as the above.
Spark plug caps must be new shiny 5k ohm jobs.
Original coils are good but can overheat when used for EI. Again they get hotter cos they are working twice as hard. Also fail twice as quick. May need an ally heatsink, mine did.
Had no end of problems when switching to EI, All sorted now, Plugs must be changed more regularly.
Also, a binding front brake can cause overheating. Idling too long, they dont like idling. Blocked main jets will cause it to bog down and feel slack, Take them off, take the float bowl off and waste 2 cans of carb or brake cleaner in every orifice you can. Remove jets, inspect, Check float height, this is another common problem, lack of fuel through poorly adjusted floats.

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