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Rebuilt with RB-100, new fuel filter & primer. Checked the needle lift with the Zama flat edge tool. Bottomed both H and L and opened 1/2 turn each.
At first I noticed it took forever to prime.
It starts easy and idle nicely. At first, it would rev up great. But as soon as you let off the throttle it would die. Then take for ever to crank again. I finally got it adjusted so it doesn't die when you let off the throttle. But when I was adjusting the high side, it runs the same with the high side closed or 2 turns open. About 1.5 to 1/75, it start strokin, so I back it off all the way to close to see if it would sound lean. But not even completely closed.

So does this mean there's something wrong with the L side?

When rebuilding, I was careful about not getting compressed air close to the holes. And only used SeaFoam top cleaner/lube spray on it. Cleaned all the old gasket off, All new gaskets & needle.

Now L is about 1 turn out. H is about 3/4. Response time is down, from when I first cranked it. But it doesn't die when I let off the throttle.

Also, when you gas on it, at first it feels like a V8 with a broken motor mount. LOL

The carb runs on both the L & H when WFO
When the throttle is closed the H is still there but the air flow SHOULD be so low that it can not fraw fuel through the H jet.
Thus if the throttle stop it too far open you will be idleing on both the L & H
And if the L is too far open it can supply enough fuel to maintain the engine WFO
Also double check you have not mixed up the needles as they have different tappers on them
L is LONGER .

PT check your inbox.

bertsmobile1 said:

The carb runs on both the L & H when WFO
When the throttle is closed the H is still there but the air flow SHOULD be so low that it can not fraw fuel through the H jet.
Thus if the throttle stop it too far open you will be idleing on both the L & H
And if the L is too far open it can supply enough fuel to maintain the engine WFO
Also double check you have not mixed up the needles as they have different tappers on them
L is LONGER .

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Thanks for that. I measured the needles, the one I took out and the one that came with the kit. My calipers are digital. But only go to .00 (Habor Freight specials). But none the less, they were the same.
Tappers? As in the hinge between the needle and the other side that is supposed to be flush (according to the Zama tool?

BTW, after cleaning up, I noticed I forgot to put the gasket between the breather and the carb. (the first one you come to when you take the air filter cover off. How much affect would that have on it?

PT do you have the tool to pressure test a cube carb? Do you have the W and Z guages for setting levers? If not you really need to get them if you are going to be rebuilding carbs. There are good some good vids on utube showing how to pressure test cube carbs. After you rebuild a carb you really need to pressure test it. Will tell you a lot and eliminate guessing whether it is a fuel pump, metering, check valve or primer problem. Won't tell you everything but it will tell you a lot. If it will pass the pressure test then usually a clogged passage problem. And don't use carb cleaner to clean cube carbs, ultrasonic is you best friend. If a rebuilt carb won't run with the factory initial settings probably something still wrong with the carb.

Hammermechanicman said:

PT do you have the tool to pressure test a cube carb? Do you have the W and Z guages for setting levers? If not you really need to get them if you are going to be rebuilding carbs. There are good some good vids on utube showing how to pressure test cube carbs. After you rebuild a carb you really need to pressure test it. Will tell you a lot and eliminate guessing whether it is a fuel pump, metering, check valve or primer problem. Won't tell you everything but it will tell you a lot. If it will pass the pressure test then usually a clogged passage problem. And don't use carb cleaner to clean cube carbs, ultrasonic is you best friend. If a rebuilt carb won't run with the factory initial settings probably something still wrong with the carb.

Click to expand...

I have the W & Z levelers. Looking at pressure testers this morning. Also leak down testers.

Eliminating guess work is going to be a HUGE advantage. @bertsmobile1 told me this months ago. Just now getting enough cash flow to make it possible. Just about the time I think i have all the tools I need, one of you pro's comes up with another tool I need. lol


Note to add. I'm looking at a few on Amazon, some are like $140, with case and a lot of adapters and hose. Some are just the tool with the gauge. Are all those adapters necessary?
Mityvac MV8500 Silverline Elite Repair/Diagnostic Kit

You never have enough tools. I don't care what your wife says.

Hammermechanicman said:

You never have enough tools. I don't care what your wife says.

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Exactly. When she brings the subject up, just point to her closet.

Just your W and Z tools, there is a second newer W tool now and you need to add it to your ever growing tool inventory. 500-528-1 is usually not separately available but is in the spiral diaphragm kits.

On the pressure tester get one that can do both pressure and vacuum tests.

And yes tools are definitely expensive and not of the tools you need are available either as I got several handmade tools here that makes my works much easier.

PT want would your wife scream if you had the 10K in tools I got here. And I thought just a couple hundred dollars in tools was a lot when I first started.

I wouldn't know where to start, trying to figure out how much I have in tools already. My tool box is full, compressors, USC, drill presses, grinders drills, who whole drawer full of drill bits, carts, battery chargers. I've had to organize my brothers tool box so I can use one of his drawers. The last wooden work bench I build, I put two 24" drawers in it, That took like 5 minutes to fill up. I got tired of having my needle nose pliers mixed in with my other pliers.
Crap. Now that I think about it, I need to take all those heavy plies out of that wooden drawer, and swap them out with the electrical drawed in my tool box.
Something to do til the rain quits. As if there wasn't already enough to do.

My wife gave up years ago. She has even given up saying "what did that cost". Got my eye on a $3k CNC for wood projects. She just said where you gonna put it?
I think. We need a show us your shop thread.
I just love ethanol gas and lazy people.

Hammermechanicman said:

My wife gave up years ago. She has even given up saying "what did that cost". Got my eye on a $3k CNC for wood projects. She just said where you gonna put it?
I think. We need a show us your shop thread.
I just love ethanol gas and lazy people.

Click to expand...

You guys are lucky. I'm having to share a shop (now) with my brother, who's a contractor. I get like one corner, and a little bit of the middle of his shop. The shop is a 20x28. But he's got table saws, tile saws, 5 broken compressors (small ones) a whole wall and corner full of paint, doors, racks of burned out or messed up power tools, spray guns, tile, bags of grout and a crap load of other things.
Don't get me wrong, I'm grateful for the space I do have. But I need more.
He's already complaining that I'm taking over his shop. But hell, he's never out here, except to either get something or store something else.

I miss my old shop. covered storage building, plus 3 bays. IIRC, it was about 20X30 also. But it was all mine. And I had a place to work on mowers when it was raining.

My mower shop is a 24 x 24 building. I do have a 60 x 72 barn that my wife thinks is hers. I probably need to throw out about 2 tons of stuff i will never touch to make room for more woodworking stuff. At last count i had about 30 things with gas engines on them in there too. Is that too many?

Hammermechanicman said:

My mower shop is a 24 x 24 building. I do have a 60 x 72 barn that my wife thinks is hers. I probably need to throw out about 2 tons of stuff i will never touch to make room for more woodworking stuff. At last count i had about 30 things with gas engines on them in there too. Is that too many?

Click to expand...

Too many? Shut yo mouff!!!!! Like tools, there's no such thing as too much.

PTmowerMech said:

I have the W & Z levelers. Looking at pressure testers this morning. Also leak down testers.

Eliminating guess work is going to be a HUGE advantage. @bertsmobile1 told me this months ago. Just now getting enough cash flow to make it possible. Just about the time I think i have all the tools I need, one of you pro's comes up with another tool I need. lol


Note to add. I'm looking at a few on Amazon, some are like $140, with case and a lot of adapters and hose. Some are just the tool with the gauge. Are all those adapters necessary?
Mityvac MV8500 Silverline Elite Repair/Diagnostic Kit

Click to expand...

Right gun, the plastic one is not up to the job.
Most of the stuff in that kit you will never use as they are car specific .
Mine has about 2' of 3/16" tygon on the gun then a joiner to hook thinner tube to.
After that there are short lenghts of all the small tubes and 3 golf Tees to act as stoppers.
The joiners came from Tiny Tach .
While I was there buying the hand held tacho I got 2 joiners which I should have turned up myself but they were cheap and made no difference to the freight,
Bought 4 of the rubber blanking off plugs which are easier to use than the folded over inner tube I had been using
Bought a 3 prong clutch tool, love it .
Don't need the 2 prong because I use bolts & washers in the slot of an old chain saw bar for 2 pin.
The spark plug adapter is good if you don't have a couple but I made some of them decades ago.
Their compression tester is also really good because the plug is short & small.
Most times when you see a really high cylinder pressure it is because the tool is taking up 1/2 of the squish volume

PTmowerMech said:

I wouldn't know where to start, trying to figure out how much I have in tools already. My tool box is full, compressors, USC, drill presses, grinders drills, who whole drawer full of drill bits, carts, battery chargers. I've had to organize my brothers tool box so I can use one of his drawers. The last wooden work bench I build, I put two 24" drawers in it, That took like 5 minutes to fill up. I got tired of having my needle nose pliers mixed in with my other pliers.
Crap. Now that I think about it, I need to take all those heavy plies out of that wooden drawer, and swap them out with the electrical drawed in my tool box.
Something to do til the rain quits. As if there wasn't already enough to do.

Click to expand...

Last year I forgot to fill the LPG tank n the van that is LPG only .
Went back to the shop try and find the tatally illegal spare gas tank to get me to the servor.
IT started raining so gave up till the morning
Went back & some !#&* had busted the window and nicked the tool box & jump start pack
When I initally reported it as stolen I put a value of $ 500 on the tool box
When I actually filled in the detailed report it came out to $ 3800 and they are all cheapish tools ( Craftsman quality ) I keep in the on site box cause you are always loosing them.

AS for shed space, mine is full .
THe only jobs I do inside is trannies & engine internals which get done in a wetted down bathroom & cube carbs .
Everything else is done on the table across the fork lift blades , under the engine crane in the door or the yard crane in the yard.
Good thing is it does not snow here and we only get about 60 days of rain