Carburetor issue?

[somethingabouttheloons]

I will give that a shot lindy46
Is the needles spring supposed to just clip onto float flange from the side or actually go up through one of the two holes
on the float( flange).I saw a video of a guy rebuilding this type carb and he brought it up through one of flange holes.

 

[racerone]

The clip does not need to go through any holes.----Videos can be entertaining !

 

[somethingabouttheloons]

yes it looked like it could cause the needle to get hung up

 

[somethingabouttheloons]

I tried out what you said lindy46 and air passes when right side up an does not when upside down.
I am wondering if it's possible there is not enough fuel interring the bowl to allow the float to rise up
high enough to seat the needle. This motor has the original fuel filter that screws into the tank. I
soaked the filter a couple of days in mineral spirits when I first started going through this motor.
Maybe my fuel flow is restricted a bit due to only seeping through filter. I initially looked for a replacement
but could not find one so I decided to try and clean the one I had.Any thoughts on the filter theory causing my issue?

 

[somethingabouttheloons]

Now I am second guessing my last post, even with restricted flow, the bowl would fill up if sitting long enough.
Guess I need to better understand exactly how the carburetor functions.

 

[lindy46]

Think of a toilet tank float. As water rises, the float rises until it reaches a level to where the valve is shut off by the rising float. If the water isn't high enough, you bend the float rod up slightly to allow more water into the tank. Conversely, if the water level is too high, you bend the rod down so the float closes the valve sooner. Same with your carb float. If gas is too high in the float bowl and runs out the throat of the carb, bend the float rod down slightly so the gas level in the bowl is lower.

Regarding the fuel filter, they can't be successfully cleaned. They MUST be replaced. I've tried to clean them and it can't be done. But fuel flow into the carb bowl doesn't appear to be your problem. You have too much fuel entering the bowl before the float closes the valve. Get the fuel level adjusted so the bowl doesn't overfill, and see how it runs before replacing the filter. Then if you find fuel is not flowing into the bowl fast enough to keep up with the running motor, replace the filter.

 

[F_R]

Hi F_R, Can you please look at attached photos and tell me if the passages pointed out are the bowl vents or vent?

Yes, one (or both) of those holes are vents. I can't tell for sure which one without having the carb in hand. To help understand, suppose you turn a bottle upside down and stick it in the lake. Does the bottle fill with water? Nope. Why not? Because the bottle is full of air. Likewise, the fuel can't rise in the float bowl, and it it can't rise it can't float the float, and if the float doesn't rise it won't close the inlet needle,

Furthermore, suppose you were to drill a hole in the side of that bottle and stick it into the lake. Now the water will rise up to the level of the hole, but not beyond because the space above the hole is still full of air. Relating back to the carb, the hole in the side is the main jet. The fuel rises to (and out) the jet but not beyond and doesn't close the needle valve

All this is in naught, if the vent isn't plugged.

 

[racerone]

Change the tilt angle on the motor.-----Your choke is working really well and fuel leaks out.----Lean the motor back and install the silencer.-----Than you won't see the apparent leak.-----Motor and carburetor are working as designed.----There is no problem !!

 

[somethingabouttheloons]

Thank you for your inputs and replies. I am trying to learn how these things tick and it's very helpfull when you guys are willing to take the time and share your knowledge so that others benefit from your experience. It's unfortunate that some would rather ridicule someone less knowledgeable in a subject than they are.I really like these old motors and would like to make them a bit of a hobby. I have a great deal to learn and really do respect and value good positive feedback.

 

[somethingabouttheloons]

F_R, Do you recall posting a reply to someone regarding making a filter for these older motors?
I thought I had stumbled across a thread but don't remember where it was. Seems like there just isn't
enough space to try and install an inline filter outside of tank.

 

[lindy46]

Since these motors have a copper fuel line, you'd have to convert to a flexible line in order to use an inline filter. Then you'd have to fashion connectors for both ends. Probably cheaper just to buy a new filter. Part #277187.

 

[somethingabouttheloons]

I looked into a replacement filter but the place I have been buying my parts does not carry them
anymore. The only others I've found were on ebay and even though they say new they don't
new. I was a bit gun shy to pull the trigger.$49 bucks seemed pretty steep as well.

 

[lindy46]

There are several on EBay a lot cheaper than that. NOS may not look pretty but will work fine.

 

[somethingabouttheloons]

I'll have another look, thanks

 

[KG ON]

The fuel was leaking out of the vent because of the needle and seat. Flip the carb upside down, blow in the main fuel line fitting on the carb, if air leaks by then the needle/seat/float has a problem with installation or something.

 

[oldboat1]

Use carb cleaner with the plastic nozzle to clear out every opening you can find (check where the fluid exits). Take off the the domed plug on top and use the same method to clean out the idle passages. You should have a nozzle running vertically up in the carb from the bowl. This screws out, and each of the holes in the nozzle needs to be cleared (small wire and carb spray). There should be a cork seal at the bottom of the nozzle. The little clip for the carb needle looks a little bigger than I would expect, but in any case is meant to clip into the machined slot on top of the newer needle. That needle will have a neoprene tip which can stick, but seals better (in theory, I guess). You can't use the old style needle with the clip.

 

[somethingabouttheloons]

Thanks for the posts, I believe my carb is in good working order now and my problem is more
of a timing or spark issue.

 

[somethingabouttheloons]

Should the points just start to open at beginning of the machined high cam window and .020 in the middle of the window?

 

[lindy46]

.020" when the rub block aligns with the flywheel key. The word "top" just means that that is the top side of the Cam.

 

[racerone]

Points can be accurately set using a meter and the timing marks on the flywheel and magneto plate.