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 ,

  You lose about 2.77% of your HP for every 1000 feet above sea level.

You, at 4400 feet you lose about 12% of your engines actual HP.

                        Hope this helps!!

                                                    Fred   

Mang wrote:

Hi Mang,

At that altitude, you may have to purchase an altitude kit that consists of a different main jet.  If I'm not mistaken, and your machine is actually set up to operate at sea level, it may require a leaner high speed jet.  Less air mean less fuel is needed.  It may make the engine run better, but at some point, and I'm not sure if 4,400 ft above sea level qualifies, but the engine will never be able to achieve its optimum power output.  I suggest you consult with a local dealer for your machine.  They'll know exactly what you need.  Hope this helps.

jubol wrote:

Fred,

I just saw your post.  He's running too rich a mixture if he's set up for sea level, correct??

 Richie,

      Sure is!!!!!

That's why the adjustable carb is a great asset.

You can change your fuel settings on your carb any where you are in elevation.

                                                                Fred 

To rich huh, I guess that's logical, all these carbs are the same on this model no matter where you buy it probably.

Maybe that's why it stumbles?

 Mang,

      Please read the Richie "Got me hooked" thread on Carbs!!

  Might help you!

                                    Fred 

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