Oregon 50-659 Carburetor Replacement for Tecumseh 640349

Oregon 50-659 Carburetor Replacement for Tecumseh 640349

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Item # 4937

 (3 Reviews)


  • Make sure this fits by entering your model number.
  • For models HMSK90, LH318SA, LH358SA
  • Replaces MFG No. 5313, 5002, 5036
  • Limited Warranty; Free from defects in materials and workmanship for as long as they are owned by the original retail purchaser

Oregon 50-659 Replacement Carburetor For Tecumseh 640349. OREGON is a world leader in saw chain, guide bars, sprockets and forestry accessories and a leading manufacturer and supplier of lawn mower blades and other outdoor equipment parts. They offer more than 8,000 quality products-among the widest selections of first-class, innovative products available in the industry.
Note: Put a genuine Tecumseh bowl o-ring (631028) around the bowl to the body to get it to quit leaking.

November 8, 2012:

This replacement carburetor by Oregon is a replacement for the Tecumseh 640349 carburetor on my 10.5 horse Poulan Pro snow blower.

The issue I was having is my snow blower would cycle the governor at any setting other than full throttle (slow way down, then race the throttle, repeatedly). At anything below 1/3 throttle, the engine would die.

I pulled the OEM carburetor to clean it and forgot to remove the rubber seat for the needle valve. Carb cleaner and rubber don't mix well and the carb cleaner melted the rubber seat. Oops.

Rather than rebuild the OEM carb, I purchased this Oregon model as a direct replacement. The replacement looks identical to the OEM carburetor with one exception: the replacement does not have a separate float bowl drain.

The new Oregon carburetor fit perfect and the motor literally started on the first pull. Now it runs fine at all speeds and idles great. I'm very pleased with the replacement.

Update December 1, 2015: Time for another Carburetor replacement... and I know exactly which one to get.

Winter of 2014 / 2015 my snow thrower saw virtually no use and spent most of the year just sitting. Usually I either add a gas stabilizer additive for a short term sit or drain the gas tank and run the fuel system dry for more long term storage. I thought I had run the fuel out before putting it away, but to be honest I don't recall.

When I went to fire it up two days ago, I filled the empty tank with fresh gas, checked the oil, plugged in the electric start, and tried to fire it up. I knew I was in trouble just by the smell; I had failed to completely drain the fuel system and had stale gas in the carburetor. The smell of stale gas is hard to describe, but I liken it to the smell of rancid saltine crackers or ramen noodles.

I pulled the brass nut on the float bowl, drained the bad gas, and confirmed my suspicion that I had obviously been negligent in my maintenance duties. The entire inside of the float bowl was coated green and all the brass was growing chunks of corrosion. Every orifice was plugged and I knew I would have a heck of a time cleaning the jet.

Today, twenty-five dollars and a mere two days later, my new Oregon replacement carburetor arrived. Installation was painless, though I believe I'll have to replace the fuel and primer lines soon as they are starting to become slightly brittle.

Once fully assembled, I turned back on the fuel, primed it to fill the carburetor bowl, and tried to start the engine; however it did not start on the first pull...

It took two pulls because I had used too much choke on the first pull. =^) Beside using less choke, no adjustments were needed on the carburetor to get the snow thrower running again.

Guess what I'm not going to forget to do at the end of the snow season? ;^)
By R. Erickson November 8, 2012
Like many reviewers, I balked at paying $75-$90 for a new OEM carb, and on balance the reviews for this one make it seem like a reasonable alternative. Well...

I installed this Oregon carburetor last winter on my Husqvarna snowblower after a rebuild failed to resurrect the old one. It was a direct fit and intalled easily, so that was a positive. I also replaced the fuel and primer lines and only used Trufuel in order to a avoid ethanol related problems. The carb immediately leaked a little bit at the bowl, so I removed it, cleaned it out, checked the float and reinstalled. Twice. It seemed okay for the remainder of the season, which for those of us in the northeast involved record amounts of snow. Fast forward to this year.

I got through two storms with this carb and was cleaning up from a third last week. I thought it had been going through fuel too quickly this year and lo and behold, when I shut her down fuel was spraying out of the tiny vent pinhole on the side of the carburetor. When I took it off the float was full of gas. I'd had enough and shelled out full price for a new carburetor at a local dealer. I put it on and so far so good.

I'm glad some have had luck with this Oregon carburetor, though I wonder how many have lasted more than a season. As for me, never again. The time suck and aggravation of having to do repairs in low temps with a storm on the way is not worth saving a few bucks.
By Silanageige February 12, 2016
Was looking for a replacement carburetor for my neighbors snow blower that had succumbed to the dreaded Ethanol issues that seem to screw up so many small engines during storage. Was looking to buy the OEM carb (Tecumseh) but they are out of business and this won me over on price. I've used Oregon carbs in the past and they have generally proved to be a good replacement component and this one did not disappoint. Mounted exactly as the original and was supplied with a few parts to accommodate different choke and governor linkage arrangements. The most confusing part of the assembly was which spring to use. The directions listed a number of different engine models with various full throttle speeds (RPM's) and included a couple of linkage springs (that were supposed to be color coded but weren't) so I was left guessing which should be used. I ended up using the original spring and used it in the holes that it was originally mounted in and it seemed to run good. Started the motor, ran great for about 5 minutes and then started surging requiring choking it to keep it running smoothly. In the end I had to remove the carb and clean it out with carb cleaner and reinstall it. Ran great after being cleaned and blown out. Not certain where I picked up sediment since I had drained and flushed the gas tank, replaced the fuel line and put in new gas. Might have been something left in the carb during manufacturing which is why I only gave it 4 stars
By Rich October 19, 2015