Sears C459-52381 will not stay running

Hi all!! I have a Sears snowthrower model C459-52381 with a 3hp tecumseh 1628 3202 engine that I was told is an AH600 that will not stay running longer than about 3sec . Now I've taken the carb out and soaked it in Permatex dip carb cleaner (expensive stuff), put a new needle valve, seat and welch plug in it. Delivery of fuel from the tank...Good, float adjusted and moving freely....Good, air vane governor moving freely and connected.... Good, spark... good. It always starts in 1 or 2 pulls then dies in a couple of seconds. I've tried adjusting the float both ways (started with 11/64 drill bit)with no success. All passage ways in the carb seem free and clear. This carb is non-adjustable with no throttle control (fixed speed). What else should I check and how to. I have run out of ideas with this thing . Any help at all would be greatly appreciated.

Thanks,

 

still sounds like you didn't get it all, sometimes it could take a couple cleanings to clean up a badly gummed/trashed up carb.

 

check the main jet for a blockage

 

Might want to check gas cap for venting properly.
Fuel line pinched?
Fuel shut off valve opened all the way?
Kill switch grounding out?
Just some silly wild a##ed ideas
Hope you get it running,hate to see anyone shovel!!!
T.J.

 

When you did have the carburetor apart did you see any rust/corrosion build-up? Possibly indicating water intrusion and thereby ruining the carburetor necessitating replacement? Did you also soak the main jet in the cleaner?

 

Hi Puey61, no sign of rust or corrosion anywhere. The carb was soaked in Permatex dip for over 24hrs and I sprayed cleaner though all the passages and everything seems clear unless there is a tiny hole somewhere that I cannot see that is still plugged even though I looked very hard under a magnifying glass.
I Have a 5HP B&S snowblower also so I will not have to shovel, I just want to get this one running. Lol.

 

check the mainjet to see if it's removable. could be a cross drilled passage that's clogged

 

I believe this carburetor has a fixed main jet...Does it? Did you soak it as well? This may be the problem, however, this part is no longer available but is Tecumseh part number 632339. If you've soaked it and you still have the same trouble you'll want to do a local search for a dealer who happens to have this part on their shelf. Otherwise, a new carburetor may be needed, Tecumseh part number 640098A. Before you go to this expense be sure to inspect the piston and cylinder by way of removing the muffler and be sure that these such are in good condition before proceding further.

 

OK... the # stamped on the carb is "1006 G30". I can keep it running by holding the choke plate fully closed (without holding it stays open a bit). I don't see any other way to adjust this carb other than the float bowl and turning the choke plate to try to keep it closed. Which way should I adjust the float to compansate for it needing to be fully choked to run? If I rotate the choke plate CW or CCW will it stay more closed without holding it? I think the float bowl needs more fuel.

 

It sounds like it's getting enough fuel into the bowl since you can choke it and keep it running. I think something is still clogged in the carb. It happens, even after many cleanings. I've thrown carbs away after cleaning them over and over.

 

If, to date, you have given all correct numbers then this is not the original carburetor. The 1006 ID number you gave uses an available fixed main jet, part number 632385. Please answer the questions I asked in my last post.

 

Hi Puey61. I've soaked the carb in Permatex dip twice for about 24hrs. I blasted all the passages with air before soaking the second time. It seems to be a fixed main jet though I am not familiar with the different types. I cannot see how to remove the jet without damaging it. Is there a special tool for this? How do I remove the jet? The piston and cylinder are in good shape.
I found this machine on garbage day so I'm not sure if all the parts are original. If the carb is not the original one than which one is?