Set up information for carb / throttle cable.

[ipbr21054]

Fitted another engine in my petrol mower.
Just need some advice please for the throttle cable to carb set up.
I have the mower running but the revs are contact. In that I mean when I move the throttle lever to the slow position or even the other way to the choke the revs don’t alter this staying the same.
So my carb has the float bowl. The air filter is the foam rectangle shape say 6 x 4.
Behind the air filter box is the cable connection.
The inner wire which has a hook on the end passes through a hole in the lever.
The outer cable is clamped in place by a bracket / Phillips screw clamping plate.
So at present the outer cable has about 1 inch showing after the clamping plate.

Now my issue is do I need to make the outer less of a distance or more of a distance past the clamping plate.

I can cut grass fine with the static revs but I have no control of being able to increase or decrease the revs.

 

[carmanmemoranda]

If I understand you right. Not enough movement of inner cable in effect?

Make the outer cable shorter from clamp plate to lever so you have more inner cable movement

 

[lostinthelight]

Glad you managed to get an engine.
Are you positive the carb off the doner engine isn't set to run at working revs by default, in which case the carb linkages not the cable could need fiddling with

 

[ipbr21054]

when I looked & started it I was able to operate the throttle lever & the revs would go up & down like you should.

I put his engine in my mower but changed his bits for mine this carb etc.

So I put the cable in the clamp & did the screw up. I am able to start the mower & I hear it running at let’s say 3000 rpm.
I operate the lever to tortoise & then to hare, now I’m expect the rpm to go down to 800 rpm the up to say 5000 rpm BUT it stays at 3000 rpm regardless of throttle movement.

So it’s down to where the inner cable connects engine side. It’s position of the lever and cable position where it’s clamped.

 

[ipbr21054]

I attach a photo of what I’m referring to.
Red arrow carb lever.
Green arrow cable clamp.
Blue arrow shows length of outer cable.

So revs are the same regardless of where the throttle lever is.

Does the carb lever need to be in a certain place ?

To allow me control of revs using throttle lever does the length of outer cable need to be longer or shorter ?

 

[Harry Bloomfield]

Normally, to increase the revs, the inner cable needs to be pulled, or be shorted - that would mean the outer longer to increase revs.

 

[ipbr21054]

So what’s the process please for this to be done in respect of carb lever & throttle control lever.

 

[Harry Bloomfield]

So what’s the process please for this to be done in respect of carb lever & throttle control lever.

Normally, the inner set at slow/tortoise, would not be pulling at all on the carburettor lever. It would have a small amount of slack.

 

[carmanmemoranda]

So what’s the process please for this to be done in respect of carb lever & throttle control lever.

Read post 2

 

[ipbr21054]

Ok
Just wanted a reply from this member so I understand the process two different ways.

Thanks.

 

[lostinthelight]

Dont get too hung up on matching the control lever on the handle to the fast and slow symbol when you swap engines if thats your issue. If you disconnect the inner cable from the carb, then if you operate the lever it came off, do you get full control of the revs?

 

[ipbr21054]

Raining here so can’t do anything.
My issue is slow or fast or choke the revs do not alter.

I can’t try any of the above due to weather.

 

[lostinthelight]

Raining here so can’t do anything.
My issue is slow or fast or choke the revs do not alter.

I can’t try any of the above due to weather.

Did everything work as normal on the donor mower before you did the transplant

 

[ipbr21054]

Yes.

Put lever on choke to start.
Then moved lever to fast revs say 8000 rpm.
Then down to slow & revs say 2000 rpm.
So I had control.

Now moving lever on my mower revs the same regardless of lever position hence correct set up needed.

 

[lostinthelight]

So just to be clear, your throttle lever at one end if travel is stop position and the other end is choke or is stop operated by the dead man bar