Wierd carb problem

[gemini641]

Just got the '05 Bullet Deluxe on the road again after busting the Sprag clutch from backfires. Finally got the timing just right and pretty good tune on the carburettor but it's doing something funny.

When I crack the throttle open and let it off, instead of immediately dropping back down to idle, she continues to "race" and very, very slowly drops back to idle. I noticed when I was riding today it was almost like power shifting, which I don't do.

The throttle cable run is free and  I can hear and see  the throttle block "clunk" home when I let go of the twist grip so it ain't the cable. Maybe in one of the internal circuuits in the carb?

Anybody got any suggestions? Going to work on it tomorrow and see what I come up with.

Tom

[dogbone]

Look for a vaccum leak, the rubber mounting flange cracks, replace it with the lucas part,they last much longer. It could also be intake valve too tight.

[gapl53]

Isn't that an oxymoron saying Lucas parts and lasting longer in the same sentence?

[dogbone]

GAP 53    The worst part is the overall q of the oem part!!!  Maybe they are outsoursing from China to India   

[dewjantim]

Look for a vaccum leak, the rubber mounting flange cracks, replace it with the lucas part,they last much longer. It could also be intake valve too tight.

Yep, Dogbone is probably right, vacume leak, or valves too tight.......Dew.

[gapl53]

GAP 53    The worst part is the overall q of the OEM part!!!  Maybe they are outsoursing from China to India   

If they are outsourcing the quality has got to be better. I'm basing my experience on British cars and motorcycles from the 1950's and 60's. Lucas electronics were a nightmare and as backwards as they came.

[gemini641]

Well, vacuum leak seems to be the consensus, even Tait said the same thing right off the back.

Have the Amal intake rubber and it seems sound, no cracks. I tightened it down pretty good. And I double checked  the intake hole for the PAV system which I had previously removed. No leak there.

It is running a  better but I'll check the intake valve today and see what's what.

Thanks, guys, I'll report when I find the problem. Meanwhile I'm going for a ride on this beautiful sunny day in Tidewater.

Tom

[gemini641]

Thanks, Blltrdr,

Will continue to tweak the carb sisnce I can't seem to find any air leaks.

Tom

[DaveG297]

U can spray some WD50 around the carb manifold and watch the exhaust....if it smokes a little you have a vaccuum leak.   My bike had had two cracked intake rubber replaced.   Now I keep a roll of sticky rubber tape in the side cover just to patch things up if need be....dg

[gapl53]

U can spray some WD50 around the carb manifold and watch the exhaust....if it smokes a little you have a vaccuum leak.   My bike had had two cracked intake rubber replaced.   Now I keep a roll of sticky rubber tape in the side cover just to patch things up if need be....dg

I believes he means WD40.

You will also hear the engine pickup rpm when the vacuum leak is sprayed.

We use it to start engines insteed of ether due to the lubricating factors. Works about as well too!

WD40 is that wonder liquid that no workshop should be without, it has many diversified applications.

[Leonard]

WD40 is that wonder liquid that no workshop should be without, it has many diversified applications.

If it is suppose to move and doesn't use WD-40.  If it isn't suppose to move and does, use duct tape.

[baird4444]

 
[/quote]

I believes he means WD40.
You will also hear the engine pickup rpm when the vacuum leak is sprayed.
We use it to start engines insteed of ether due to the lubricating factors. Works about as well too! WD40 is that wonder liquid that no workshop should be without, it has many diversified applications.
[/quote]

Yes it is handy stuff to have around BUT....
It is not a very good lubicant for metal. Get you some
"PB Blaster"  for rusted, corroded, and stuck fasteners!!
You will love it.
    - MIke

[gapl53]

WD40 is that wonder liquid that no workshop should be without, it has many diversified applications.

If it is suppose to move and doesn't use WD-40.  If it isn't suppose to move and does, use duct tape.

ABSOLUTLY!


Is Red Green your hero too! He's mine.

[VMAX]

Red Green is good, but I like Harold. He has about as much mechanical insight as I do. Sad but true!

[DaveG297]

WD 50,,,,,wonder where I was when I wrote that.   Maybe its the new improved stuff..ha