Toro CCR3650 snowblower just won't start

[sblg43]

I am working on a Toro CCR3650 snowblower (single stage). Toro model 38518 serial 230008455 I believe it has a Briggs and Stratton 084233-0198-E1 engine. I have cleaned every orifice, hole and cranny that I could on the carb. There is nothing plugging up the muffler. There is very good spark. When I add fuel mix to the cylinder through the spark plug hole, I get combustion. I just cannot seem to get fuel through the carb. The spark plug is dry as a bone. I don't know what I could have missed on the carb. I watched videos on youtube, downloaded PDF files explaining a complete disassembly, cleaning and reassembly of this particular carb and still no go. Is it time for a new carb at $100 per each or what?

[StarTech]

When I add fuel mix to the cylinder through the spark plug hole, I get combustion. I just cannot seem to get fuel through the carb. The spark plug is dry as a bone.

Have you tried just adding the fuel though the carburetor throat? I am thinking if the the carburetor have either been chemically or ultrasonically cleaned that either the intake gaskets or crankcase seals are leaking or missing. There got to be a vacuum at the carburetor for fuel to drawn into the cylinder. But to too eliminate the carburetor the putting fuel in through its throat would help determine if it is still plugged or not.

[Deere2me]

Being a two cycle, ya wanna pull the muffler and check the rings, make sure they ain't stuck. Check the cyl. for scoring etc. If the rings are stuck etc you wont get any fuel transfer to support combustion. You also should check the crank seals.The best way to do that is with a vac/pressure test, but a good visual inspection might suffice.

[StarTech]

Being a two cycle, ya wanna pull the muffler and check the rings, make sure they ain't stuck.

If the rings were struck he won't even get it to hit by adding fuel directly to the cylinder. No compression to very little is the normal result from struck rings.

[bgsengine]

Being a two cycle, ya wanna pull the muffler and check the rings, make sure they ain't stuck.

If the rings were struck he won't even get it to hit by adding fuel directly to the cylinder. No compression to very little is the normal result from struck rings.

Wanna bet?
Been there, done that. She'd start and run (Very badly) though rings were pretty well stuck (rusted in) - there was JUST enough compression it could fire after a few pulls - It does not take much compression to fire off a well atomized fuel mix introduced directly to the cylinder and atomized by the constant movement of the piston.

[StarTech]

Hmmm. I must be a little lazy then as if it doesn't start after a few pulls by adding the fuel directly I usually do a compression test. Oh well my bad.

[Deere2me]

Pulling the muffler to inspect the ring/cylinder & port condition is pretty much the first thing I do on any two-stroke that I work on. I learned that ,Oh, lets see now...'bout forty-five years or so ago. At that time most all two strokes had reed induction.

[Skywatcher]

Hi SPLG

These little B&S 2 cycles can be a little fussy at times. If you are getting fire when you add fuel directly into spark plug hole, try as Starfire suggested and give the engine a shot of fuel into the carburetor venturi or throat. Another check to make is to verify crankcase compression. Switch ignition key off and remove spark plug. With choke off and throttle open, give engine a brisk pull over with the recoil starter. You should hear a crisp popping sound from the spark plug hole as the piston moves to the bottom of the stroke and uncovers the transfer ports to release the crankcase compression into the cylinder.

Deere2me made mention of reed valves. A stuck or damaged reed valve will cause the exact symptoms you describe in your engine, however, from what I can tell this is a piston ported engine meaning the skirt of the piston works as the intake valve for the crankcase. Starfire also made mention of gaskets and seals. Check and if necessary, replace the gaskets both ends of the intake elbow and make sure all gasket surfaces are clean and flat before reassembling.

One more thing, have you tried hooking up a temporary fuel supply to the carburetor to make sure your problem isn't in the fuel tank? A temporary fuel supply can be as simple as a small funnel connected to a length of fuel line which is hooked to the fuel inlet on the carburetor. Hope this gives you something to work with. All the best,

Sky

[jwales]

Sky makes a very good point. Could be junk in the tank plugging the exit. Some of these I have seen also have an inline fuel filter which could be plugged and of course with our fine ethanol fuels the fuel line could be in bad shape causing fuel restriction.

[sblg43]

Yep, ring was stuck. Replaced the ring and all is well. Thanks all!