SOHC.co.uk Forums > CB500/550

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

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UK Pete:
Do you ride the monkey bike much?  I have a Honda dax which i dont really ride much, i bought a chinese 125 engine for it as well as a loom and all parts needed to turn the bike in to a 125 12 volt, but i lost interest and have not touched it in two years, i will keep it as they rise in value all the time, maybee some time i will do the engine swap just to see how it goes
As for your bike with the problems, take your time and do everthing as properly and cleanly as you can so you dont have to keep re-doing the same thing, sooner or later you will hit the jack pot and all will be good.
Pete

totty:
I use it to get to work when the weather's nice and also do one or two of the many organised runs.
Mines just a Chinese z50 copy running a 120 engine.

matthewmosse:
Checked compression? My first 550k3 wouldn't behave at all if hot, ran too fast or cut out, down on power and overheating. Starting from hot was inpossible (also leaked oil like a sieve) Turned out the top piston ring was MIA on all 4 pistons, tops of the pistons were cream crackerd. half a ring was found in sump, no idea where the rest of them went (suspect very poor PO rebuild) Amasingly out of traffic it ran fine, started first or second go from cold and reached 105mph as quick as a good one. Good news was it was an easy repair,  one set of good used pistons, gaskett set. Head wasn't perfect (scrored up by rings) but still toured Scotland getting fantastic mpg. Thats where the k3 rules the roost- motorway crusing A road fuel economy. Fort William accross A9? down east coast passing by Edingbourough, Perth, finally filling up at Glasgow. All on one tankfull, mates 250 superdream used over a gallon more fuel in same trip. Round town they used the same, almost to the penny when filling up.

totty:
No I haven't but I have a tester somewhere so I'll dig it out.
Since the last carb clean mines been a good starter hot or cold and it's also oil tight, but the test might highlight some other issue.

Yoshi823:
I remember coming across a problem on several Honda fours, not just my own but other peoples as well. The points cam is a sleeve that slides over the back plate of the advance/retard unit that holds the springs in place. There is little or no lubrication on this moving part & so can become quite 'sticky' & not always return the bobweights to the home position after the throttle has been closed after a rev-up. But be aware that if you pull off the cam from the advance/retard mechanism it's quite easy to get the cam 180 degrees out, so make a mark on both parts before you dismantle it. Lube with nothing heavier that 3-in-1 oil.

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