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Toro 38180 sn# 0014124 Suzuki 47pk9 engine with original Mikuni carburetor. 1990 model. a ccr2000 unit.
This machine had bad gas left in over the summer and was completely plugged come winter. It was taken apart and cleaned in a heated ultrasonic cleaner multiple times to get it cleaned out. All the jets and port were blown out with air and reassembled. it started on the first pull without any priming and ran very well, then about a week later when it was needed, it wouldn't start. It was flooded and spark plug very wet. After cleaning the plug, tried to prime and choke it to start and it just fouled the plug again. (it has a good spark)
Tried pulling the starter with the plug out to clean out any gas in the cylinder, replaced the plug and choked it but no priming; it fouled the plug again. Remove plug, clean and replace, try to start again with no choke and no priming, it started first pull and ran fine. Cleaned the driveway well and never sputtered or stalled.
Next day it would not start, plug fouled and wet. tried to clean and restart many times but it would not start, always fouled with wet gas.
Took the carburetor apart again but found nothing wrong.
While looking at Toro's break down of the carburetor (form 3313-923), I see a piece called "spacer float" part #27 . I'm not familiar with it and didn't find it in the carburetor. Is this piece something that is only found in some models or is it really missing from this unit? What is it's purpose and could it cause this flooding problem?
I originally suspected that the float wasn't shutting off the gas flow and over filling but the float and shut off needle worked correctly. All jets, needles and ports were clean, float had no gas in it. float spring was in place and working. Pilot jet was set at 1 turn from bottoming out.
I was tempted to just replace the carburetor, but it's pricey. I Did find an affordable aftermarket carb made by Flip manufacturing stating it is a direct replacement for the original 81-4690 carb. (supersede #95-7935)
If anyone has run into this problem, please enlighten me a little.
Rex

I see a replacement carburetor on E-bay for 50 dollars. You can't rebuild your old carb for that price.

After all this, I still couldn't find a problem so I purchased the new carburetor from Flip Manufacturing. It looks identical to the old one. but it didn't run well at all. Called Flip and good customer service sent a new one without any qualms, but they didn't want the old one shipped back due to gas in the carburetor. Installed it and it worked perfectly. starts first or second pull with priming and chock, just as it was when new.
I was curious why the first flip carburetor didn't work correctly so I took the first one apart and found a metal filing embedded in the needle port hole of the pilot jet, not the main jet, on the side of the carburetor. Just a speck like metal filing plugging the hole, not any bigger than the thickness of the skinniest of stick pins. if it wasn't for the fact that you could see light through the hole (or in this case couldn't see light through the hole), it would have been almost undetectable!! Just goes to show how the smallest of debris can really effect a carburetor!! :smile:

mr.farmall said:

After all this, I still couldn't find a problem so I purchased the new carburetor from Flip Manufacturing. It looks identical to the old one. but it didn't run well at all. Called Flip and good customer service sent a new one without any qualms, but they didn't want the old one shipped back due to gas in the carburetor. Installed it and it worked perfectly. starts first or second pull with priming and chock, just as it was when new.
I was curious why the first flip carburetor didn't work correctly so I took the first one apart and found a metal filing embedded in the needle port hole of the pilot jet, not the main jet, on the side of the carburetor. Just a speck like metal filing plugging the hole, not any bigger than the thickness of the skinniest stick pins. if it wasn't for the fact that you could see light through the hole (or in this case couldn't see light through the hole), it would have been almost undetectable!! Just goes to show how the smallest of debris can really effect a carburetor!! :smile:

Click to expand...

You can't beat that deal. Now you have a extra carburetor :thumbsup: