Vintage and Classic Hondas

problems after adjusting fuel mixture

_‹ Previous Topic Next Topic _›

Classic

List

Threaded

7 messages Options

Kha

problems after adjusting fuel mixture

Started my bike up today after riding it yesterday and it was dying when revving up from idle. Ran fine with throttle and everything. Been reading about the problem and people saying that it's a sign of running rich. Today I let the bike warm up and turn the idle mixture screw in just a bit and test drove it around. Would be fine and then it started to die while I was riding. First cylinder 3 and 4 sound like it wasn't firing and then the bike just died. Wouldn't started back up even with choke on. Had to push it home. Just sound like there was no gas. I'll check spark plugs tomorrow and see.

Bike was running and all before. Carbs been gone thru. Wasn't running perfect because I was still adjusting the idle mixture screw. Any body got any inputs?

TOOLS1

Re: problems after adjusting fuel mixture

Administrator

Is your fuel petcock working?
TOOLS

Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

Kha

Re: problems after adjusting fuel mixture

Yea. Got a filter on it too

Kha

Re: problems after adjusting fuel mixture

To add to the list of symptoms. While I was test driving it after the adjustments yesterday, the bike would hesitate while I was accelerating. I'm guessing I lean out the mixture too much? Just having too much problem with this fuel mixture adjustments. I think I'm just making it to difficult than it really is.

Got new ngk plugs that I'll put on later. New fuel filter just in case. Set all the fuel mixture screw back to 1 1/2 turns and start over again I guess. Will see if it starts again.

TOOLS1

Re: problems after adjusting fuel mixture

Administrator

I think you just hit the nail on the head, you are overthinking it. You are expecting the fuel adjustment screw to do too much. I think you have a problem somewhere else. Now how do you know your petcock is working correctly? Those vacuum operated petcocks (I assume you are working on a DOHC) are notorious pieces of crap! Have you checked to make sure there are no vacuum leaks around the carb boots?
TOOLS

Kha

Re: problems after adjusting fuel mixture

Tools, figured it out. Turn out it was a dirty filter. Bought a new one and now fuel is flowing like it should. Pretty happy and thanks for your help Tools. Very much appreciated!

LukeM

Re: problems after adjusting fuel mixture

Administrator

Well done. I'm thinking swapping the fuel filter should be scheduled with an oil change. They're cheap enough (the paper ones ShinyRibs recommends), and easy to swap out.

Luke M

Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.