Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I am contemplating installing my new adjustable carburator on my 10hp tecumseh engine....the red choke knob, how is it attached to the rod...threads? just pressed on?

Please let me know the secret of the tec engine.

bbwb

Mang wrote:

Mang,

It's just a simple main nozzle change that you need.  I don't have a nozzle size chart handy.  Unless I'm mistaken, all that has to be done is remove the bowl nut/main nozzle under the carburetor, and replace it with the appropriate high altitude version.  Funny thing is if you check your engine manual, you'll note that Tecumseh states that the sea-level carburetor configuration is good up to an altitude of 7,000 feet.   I don't know where these guys come up with this stuff.  My 50 HP twin cylinder snowmobile crapped out at about 2,000 feet above sea level requiring me to change the jetting while on a trip.  It ran very rich, spit and sputtered. Have your dealer get you configured correctly.  Let us know how it works out.

I'll take it to a dealer then,  for some reason I didn't think you could change the jet in these carbs,  I'll let you know how it works out.

Mang wrote:

Mang,

Sure you can.  It's just a fixed jetting rather than the older/better adjustable type.  Once the fixed jet (EPA version) is installed, the engine should start right up and run.  No further adjustment necessary.  The adjustable carburetor that I installed requires minor adjustments once started.  The difference is that I can dial in the fuel mixture for varied conditions and get the engine to run as smooth as possible. 

 Richie,

  The adjustable CARB should solve it all, If that is the way he wants to go !!

When you turn the screws you are either making it richer or leaner.

If he did that , that is, buy the adjustable carb, he might be better off as you are.

                                            Fred  IMHO  

I think I read some where on here that the oxygenated gas leans out the mixture a little,  So if I just leave it the way it  is, that might help compensate for the elevation change,  and I guess the colder it is the better it will run to,  more air

jubol wrote:

Hey there Fred,

I was actually suggesting that Mang change only the main nozzle bowl nut because that fix would only cost maybe $8.00.  I didn't want to recommend that he spends $55.00-$75.00 for an adjustable carburetor only to close up the mixture screw in order to lean it out.  I also assume this snowblower is used exclusively at altitude, if not, perhaps an adjustable carb may be a better bet.  In the end, an adjustable carb allows you to fine tune.  Fred, I'm sure either way should solve the problem.  I'm an adjustable carb man myself

Wow, this thread has taken a life of its own....

I am one of the fortunate ones who did not have that many issues with the EPA carb.  My blower always started right up and ran well without surging or acceleration problems.  What got me going on the adjustable carb was the post by Richie (Yes, Richie you did this to me) who stated that the new carb allowed the engine to run alot smoother.  My engine always vibrated what I thought was too much...it actually caused the blower to move on its own from the vibs.  The new carb, now adjusted properly has smoothed out the beast quite a bit.  I think that I now have some more power but I always seemed to have enough.  This last weekend I used my neighbors 10hp Ariens that is about 8yrs old.  His engine sure runs alot smoother and always did compared to mine.  His blower has an adjustable carb.  I noticed that his machine did not seem to have the same amount of umph that mine does.  I believe that his machine could use some adjustments the governor and the carb, but I am not going to mess with them, with my luck, something would break and I would have to get it fixed.

bbwb

bbwb wrote:

Robert,

I am just one of those guys who figures if it does not run perfect, there must be a better way to make it do it..  It does not take to much to plant a seed in my head to get it to grow.

I will admit that my neighbors machine has a much, much better drive train than mine has.  His will outlast mine by decades.

bbwb

sorry to highjack your thread.   I agree all this talk about things that can be done, I also want my machine to run as close to perfect as possible.