SOHC.co.uk Forums > CB500/550

Ongoing PD46 carburettor woes (possibly)

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deltarider:

--- Quote from: keithtraffic on June 01, 2020, 09:10:57 PM ---... just to be sure this wasn't anything to do with the plus I have swapped 1 & 4 plugs over but to no avail.
--- End quote ---
How about the plugcaps? Have you tested their resistance? Do caps 1 and 4 show more or less the same resistance? Do you run 'R' plugs by any chance?
Are you sure the idle RPM shown on your tacho are a true 1100?
Also verify the carbs vent. If necessary cut one or two inches of the vent tube(s).
For the moment, this is all I can think of. If I owned a K3, I'd add a small dose of fuel system stuff (or kerosene or lamp oil for that matter) each time you fill the tank.

K2-K6:
To extend the addative theme above, running and looking after very small carburation systems appear to  benefit from using two stroke oil with less of that "crystalline" debris accumulation that blocks small jets.

Consider something like a 90 to 1 mix ratio and assses if it reduces the incidence of blockages in these pd systems.

Johnny4428:
I have experienced a bit of these woes, as many of the people on here have. I have had my carbs off three times and have found the easiest way for me is to remove air filter box and drop air box collector with intake rubbers attached loosen off 8 m6 nuts from intake manifold pull back and slide out. This is probably not much help but I have juggled between poor or faulty plugs “ngk” and blocked pilots and this was even after an initial complete strip and rebuild of carbs. I remember prior to a complete restoration of my bike I took the carbs off and they were ultrasonically cleaned, made no difference whatsoever probably pilots blocked. Also all four had blocked vents. I now have a bike that runs and ticks over very nicely, in fact I have never had the bike running like this in the 33 years I have owned it. You will get there, (hope it doesn’t take 33 years)! Good luck!.

matthewmosse:
My k3 was always ok in the time I ran it - at least carburettion wise, and the first 6 months of that it sat idle while I passed my test. I liked the extra mpg, not that big on shorter trips but stick the bike on a motorway and the economy was great. A roads it matched my mates superdream  to the penny on fuel stops, motorway work I could get away with 50% fewer fuel stops. I did find some of the springs on the central cable area and choke return broken when I wanted to put them on my sidecar bike. Not had to resort to redex in the  fuel on a k3 but on my wifes 250 nighthawk I saved myself hours of messing around by spraying carb cleaner on the air cleaner and running with redex in the fuel. Took a few weeks commuting before it ran right but I developed a hatred of removing carbs and airbox over the years. Same trick worked with the cb500 sidecar with overflowing carbs.

deltarider:
When was this ^? Petrol has changed. Even with todays petrol K3s will run fine, provided they ride regularly. Why K3 slowjets are more prone to (partially) blocking then those in the oldstyle carbs? No idea.

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