1992 Toro ccr2000 snowthrower model # 38180 that backfires. When warmed up seems to run OK. Thought it was a fuel problem so I eliminated the fuel filter, it runs better but still backfires when cold.Please Help :)

Hi,
Backfires can often be related to fuel quality, especially when it goes away when warmed up.
Peace,
Clarke

You should put your fuel filter back on and use a new filter. If you forget to do this you will have a lot more problems later than a backfire.
Just on a side note about fuel and it directly relates to cribgy comment. First check manufractured specks on the highest octane the motor can have. What I'm about to say especially applies to 2 cycles
I'm in construction and run a lot of power tools and equipment. GET GOOD HIGH OCTANE FUEL. Almost no body address it even at a repair shop. The homeowner treats there lawn mowers and weed whackers like a tight wad when it comes to top grade fuel. The damage a lower grade fuel can do is big. Just the small end of it.
Hard to start a lot get mad flood out carb waste gas and time
Spark Plug get dirty and fouled quicker, Need to plug(s)
Valves get dirty quicker and bad seats in valves now.
Actually use more fuel to get the same torque.
Engine runs hotter because of torque loss and engine is worked harder.
Now pistons rings are wearing more, less compression to start. Pull power is diminished.
Life of machine is way less.
Over choke to run and unburnt fuel is wasted and backfires.
It amazes me that all the people at the pump will put mid or high grade gas in there vehicles and YUP here comes the gas can and right to the lowest octane. Now I think, man the weed eater or tractor will bun so little fuel in ratio cost to run it. The engine will only run so many weeks a year to cut grass not to mention shorter time on a weed eater or snowblower. Does this really make sense!
Sorry Power1000 I needer to get it out and maybe this would help you too

Signed 21 boat

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Hi,
Interesting points, and many I make professionally. I have over 40 years working on engines and a bit less on small engines. I always recommend mid-grade fuel. The base level fuel contains 90 days forth of stabilizer added, whereas, the mid-grade and high test contain 6 months of stabilizer. Easy choice as far as I am concerned.
Peace,
Clarke

Sorry crigby I wasn't going to add to your post it was a very good point. Ive been reading some of your post and its easy to tell you are a professional and expert at what you do. I'm new on joining this site and as I been reading on things on small engines that are tuff to start or pop and backfire and always think GOOD OCTANE FUEL is like a solid foundation for a house. Any how Happy New Year. You to Power1000

It sounds like a dirty carb. As the engine warms up the fuel valve doesn't stick anymore.

Possible cause: Low octane fuel without a stabilizer such as Sta-bil when stored.