Tuning after first start up-'47 Chief

[tomfiii]

Did you remove plug at mounting flange and clean channel to idle port.

[hairynob24]

Mark i know its a pain in the ass to take the carby off ,did you use a sealant on the gasket to the manifold ? if so the gasket may get broken taking the carby off but that nothing . 20 minute job ,the throttle disc has a # 13 on it ,in the closed poistion the 13 should be on the right hand sidecarby.jpg

[T. Cotten]

I pretty much removed and disassembled the carb entirely. The only piece I did not mess with is the venturi and that throttle plate.

Any stone left unturned, Mark,....

Let us know how it goes!

...Cotten

[Xtracho]

I pretty much removed and disassembled the carb entirely. The only piece I did not mess with is the venturi and that throttle plate. New float, new crush gasket for the bowl nut. I have no fuel leaks.

I do have a compressor and will pick up a stopper from the local h'ware shop. I suppose a large crescent wrench will suffice to tighten the manifold nuts at the cylinders? Honestly, if there is a leak that would be about the only spot where I could imagine there being one.

Of course, if anyone has any other areas I should check for leaks let me know.

[pisten-bully]

Do you have an air compressor?

.....Cotten

Mark, suspicions about manifold leaks are wise, so doing a leak test as Cotten suggests is wise also... at least so you can rule that out (or in as the case may be!) If you've got compressed air that's good, for me I simply purchased a large rubber stopper from the hardware store that fit tight in the flange that the carburetor mounts to, drilled a hole in the stopper and with a rubber tipped blow gun put the air to it that way. Probably should have built a plate! Oh, and tighten the manifold nuts, try running it again and see if the problem is still there.

[T. Cotten]

Mark!

There are critical places within the carburetor than cannot be cleaned without complete disassembly.
Aside from that, Linkerts have been reported to run "fine", even though the throttledisc and/or venturi were installed backwards.

Carburetors are enormously forgiving, but manifolds are not.

Do you have an air compressor?

.....Cotten

[Xtracho]

I did not entirely rebuild the carb. And if you are referring to the disc at the back of the venturi....no I did not mess with it. But will check it just to make sure.
Thanks!

[hairynob24]

Mark did you rebuild the carby ? i have seen the throttle disc placed the wrong way before similar effect ? Rob

[T. Cotten]

Mark!

The absolute test for vacuum leaks is simple:
http://virtualindian.org/11techleaktest.html
Bubbles will tell exactly where and how much a leak may exist, if any.

Good luck!

.....Cotten

[Xtracho]

As many of you have followed my posts about the Chief, you know that last month I fired her up for the first time in 30 years. Now back home for a month, I've changed out the head gaskets and found and corrected a stuck exhaust valve on the front cylinder. Fired her up again today and she runs better. But, being as how I'm new to these wonderful bikes, I'm having some issues with tuning and getting the idle set. Once I got her running today, the motor wants to stall when I roll the throttle. Like it wants to flood I think. Also, I cannot open the choke up all the way without the motor stalling and stopping. From just a newbie standpoint I would guess that fuel/air mix is the issue that needs to be addressed. But I'm not sure how best to address that and reach the point where I get proper response when rolling over the throttle. Could I have an intake leak somewhere that affects the fuel/air mix? I replaced the gasket between the carb and intake manifold. Might there be a leak where the intake manifold connects to the cylinders? Very pleased that I have her running again on both cylinders. And I will post a video tomorrow of the bike running to show what happens when I try to use the throttle. Perhaps that might help you experts help me to diagnose the problem and what I must do to address it and fix it. In the meantime, I would be very grateful at the opportunity to tap your knowledge of the problem and how best to address it.

Thanks in advance!