m carb update

johninmn · Aug 7, 2013

Thanks to all from yesterday the float was in fact rubbing on the side of the bowl. Now to the next new problem.....
I can't get it to not sputter and cough when I pull the throttle all the way open. Once the rpms are up it runs fine and it idles fine. But I can't mash thr throttle without it sputtering. Fuel flow is good air flow is good plugs wires coil cap rotor points and condenser are all new. Fuel flow through the carb is good. I can open the high idle screw up way to far and make it smoke black and close it and kill the motor. Same with idle screw. It ran good before this float issue with no coughing or sputtering and I'm fairly certain I have the float set correctly now.

north puller · Aug 7, 2013

Drill the bottom set of holes in the metering stem a little larger.

You haven't changed anything with the ignition timing have you?

johninmn · Aug 7, 2013

No I haven't changed timing. the carburetor is stockand the engine is just a 264 overboard kit with fire craters would drilling it out get me to much fuel?

rustyfarmall · Aug 7, 2013

The M&W performance improvement package was furnished with a metering stem that DID have larger holes.

What you want to do is find a drill bit that just does fit into the bottom holes of the metering stem, and then use a drill that is one size larger. If that isn't enough you can go one or two sizes larger.

If you go to big, you should be able to compensate for it by screwing the high speed idle back in a little. If all else fails, those metering stems are easy enough to come by.

johninmn · Aug 7, 2013

Ill give it a try. I got a carb kit for a super m figuring it would have the bigger parts but I guess not

rustyfarmall · Aug 7, 2013

Most carb kits are pretty much generic anymore. One size fits all.

You might try using the original metering stem, instead of the one that came in the kit.

Earl-IL · Aug 8, 2013

When boring the metering stem use number bits. Are you running about 25-27 deg. total advance on ignition.

Ed Carlsen · Aug 8, 2013

You may still have a float problem If the tractor ran good before why drill out anything Remove carb clean it in gunk carb cleaner over night go to your dentist and ask for a wire tooth pick to clean plack (wire wont break) and poke wire through all holes blow out all holes the way I set a float is to turn carb upside down and level the float with the carb base that the bowl attaches to (kinda rule of thumb) I also attach a ball valve on the drain of bowl with a barbed end to attach a clear plastic hose Run it up to the top of float bowl and attach it to one of the bowl screws with a clamp now you have a way to see where your float is set and an easy way to drain your float bowl Just a thought

m carb update

johninmn

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north puller

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johninmn

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rustyfarmall

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johninmn

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rustyfarmall

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Earl-IL

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Ed Carlsen

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