HD Forums Australia
Home
Topics

Carby gasket Bendix carby

4/4
  • Merv
    Merv
    yesterday
    Quoting Hilly on 20 Oct 2025 06:25 PM

    I got to admit a wall of flame would put me off looking as well, a welders mask perhaps 😁

    Seriously though, there must be a way of cleaning those ports out, got me looking at ultrasonic cleaners, I could sell it to the missus as a means of cleaning jewellery and such lol.
    Even after a session in one of those the ports would still need to be tested somehow, I'll see what I can dig up later, have to get sorted to go catch a plane right now.

    Hilly, first thing I did with this carby was 2 or 3 hours in an Ultrasonic bath at 50c, using the solution designed to clean brass shells. 
  • Merv
    Merv
    yesterday
    Quoting Stuart on 20 Oct 2025 07:27 PM

    Merv,

    you're well down the rabbit hole now :-) Here's some random thoughts that may have nothing to do with your issue(s).

    You mentioned you were going to replace the points earlier in this thread. Did you do this? Apologies if I missed where you said you did.

    Does the bike have a kill switch on the ignition? Is this a bit dicky and vibration at higher RPM is messing with power to the ignition? I have had a similar issue with a sidestand cutout switch on an old Jap bike I had years ago. But I'm guessing this is not your problem.

    Stuart, yes I have fitted the new points and gapped at a firm .020 but points that I removed were in good condition. At first I suspected a weak spark breaking down under compression, hence new everything except battery in the electrical department. I believe it is fuel related and because a compression test gives such good results I have to first suspect carby or at least the fuel delivery system from the air cleaner to the barrels. The different carby may tell me something. No kill switch, and would expect any intermitant electrical problem to cut the power altogether at some point. This isn't happening, as motor continues to run.
  • Stuart
    Stuart
    yesterday
    Quoting Stuart on 20 Oct 2025 07:27 PM

    Merv,

    you're well down the rabbit hole now :-) Here's some random thoughts that may have nothing to do with your issue(s).

    You mentioned you were going to replace the points earlier in this thread. Did you do this? Apologies if I missed where you said you did.

    Does the bike have a kill switch on the ignition? Is this a bit dicky and vibration at higher RPM is messing with power to the ignition? I have had a similar issue with a sidestand cutout switch on an old Jap bike I had years ago. But I'm guessing this is not your problem.

    Quoting Merv on 20 Oct 2025 10:52 PMedited: 20 Oct 2025 10:54 PM

    Stuart, yes I have fitted the new points and gapped at a firm .020 but points that I removed were in good condition. At first I suspected a weak spark breaking down under compression, hence new everything except battery in the electrical department. I believe it is fuel related and because a compression test gives such good results I have to first suspect carby or at least the fuel delivery system from the air cleaner to the barrels. The different carby may tell me something. No kill switch, and would expect any intermitant electrical problem to cut the power altogether at some point. This isn't happening, as motor continues to run.

    I'm out of ideas :-) Given what you've already done, swapping the carby out is probably the next logical step. And should tell you something. Good luck :-)

    Getting off track - my sidestand switch problem never cut out totally. When you got on the gas at various rev ranges the motor would start breaking down and backfiring. Ease off the throttle and all was well again. Never really did it while sitting still and revving the motor. I wasted a lot of time on it. And only arrived at the sidestand switch at the suggestion of an auto electrician (City Auto Electrical Services - this was a long time ago when they were up near Vic Market). I'd taken the coils in to get them tested - which he did on the spot, and for nix. Once I fixed it, I dropped a dozen cans of beer off to him. Happy days.
  • Merv
    Merv
    14 hours ago
    Yes, my problem is very similar, except I don't even get enough to get moving. Don't know where I'd start looking for a similar electrical problem, as I don't have a kick stand switch. It's a trike. Could wire the coil direct from the battery, sidestepping the existing electrical system I guess. Might give it some thought. But first the carby change.

  • Stuart
    Stuart
    13 hours ago
    Quoting Merv on 21 Oct 2025 11:49 PM

    Yes, my problem is very similar, except I don't even get enough to get moving. Don't know where I'd start looking for a similar electrical problem, as I don't have a kick stand switch. It's a trike. Could wire the coil direct from the battery, sidestepping the existing electrical system I guess. Might give it some thought. But first the carby change.

    That was why I asked about a kill switch. Not sure what else you could look at. You probably have already gone over the wiring to see if there is anything odd. Shorts, spliced wires, odd components. I've seen some electrical butchery over the years. And if I was honest, I'd say I've been responsible for some of it :-) 


Topics
4/4