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Richie


Bring On The White Stuff

Location: Long Island, New York
Joined: Dec 12, 2003
Points: 562

Replaced Standard Snowblower Carburetor with Adjustable Type
Original Message   Feb 2, 2005 4:47 pm

I had reservations about doing this on a new snowblower, but I have to tell you, this engine runs even smoother than it did before.  After the new carb was installed, I figured it didn't need to be started using full throttle as you normally would have to do.  After two hits of the primer, I raised the throttle to just over the idle position, and it started on the first pull.  In fact, it was much easier to warm up with the modified carb than it was with the original one.  I found I didn't have to manipulate the choke settings to keep it running as I did before. 

After a good warm-up, I raised the throttle to maximum and adjusted the high-speed main fuel mixture.  When the engine smoothed out, I lowered the engine speed to the idle position, only to find it was idling at 1,550 RPM's.  Amazing, because the EPA carburetor had to idle at 2,300 RPM's.  I did a fine adjustment to the low-speed mixture until it was at its smoothest.  What was most obvious to me was just how smooth it ran at any speed.  Normally there was just enough vibration that it would translate to the very long chute on this snowblower, but not anymore.  Aside from the noise these snowblowers make when running, if you grabbed the handle bars, you were only able to detect the slightest amount of vibration.

The only surprise I did notice was that after the carburetor was fully set, the maximum engine speed had increased to 3,500 RPM's.  I did make a minor adjustment to the governor to bring the speed back down to 3,400 RPMs, what it was set at prior to all of this.  Having to lower the governor setting, made it apparent to me just how much power gets robbed from the EPA carbs.  I suppose I have to look at it as the engine having that much more power available when the automatic governor kicks in when under a heavy load.  I'll put this machine up against a 10 hp snowblower any day of the week.



Richie
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Richie


Bring On The White Stuff

Location: Long Island, New York
Joined: Dec 12, 2003
Points: 562

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #14   Feb 2, 2005 8:28 pm
Hi Nibbler,

I agree with you about fuel consumption being directly related to how hard these machines work.  I also know exactly what that "under load" sound is that you mentioned, no doubt when the automatic governor is trying to do its job.  The only time this machine made that noise was when I did my EOD with about 20"+ left by the snow plows.  Then again, the engine almost died causing me to have to yank back on a 250 lb. machine.  Shortly after that is when the engine started surging, which really ticked me off.  At least today,  when I tested the engine with the new carb under load in 6" or 7" of wet snow, it never came close to putting the machine under a load.  My old Toro with the 5 hp engine would have easily given up..LOL.  I'll be sure to see if I notice a fuel difference as you and SpottedPony have suggested. 

Richie
Majorxlr8n


Location: Freehold NJ
Joined: Aug 6, 2003
Points: 1092

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #15   Feb 3, 2005 12:45 am
How about sharing the new carb part number so others can perform the swap?  Sounds like there is interest...

Marty

Richie


Bring On The White Stuff

Location: Long Island, New York
Joined: Dec 12, 2003
Points: 562

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #16   Feb 3, 2005 7:04 am
Majorxlr8n wrote:
How about sharing the new carb part number so others can perform the swap?  Sounds like there is interest...

The carburetor is on the machine and the carb box is installed and would be difficult to try to get a part number off at this time.  I will look it over and see if I can find any.  I didn't bother writing things like that down because I assumed nobody would go to such lengths as I have to get their OPE running well.  Boy was I presumptuous on that one     It was also my understanding this carburetor was a custom thing and obviously not something off the shelf.  Other than the fact it is the same carb designed for an 8 -10 HP engine, the jetting can't be stock.  What I can tell you is that the carb looked precisely as my original.  My "turn knob" choke linkage just screwed right to it.  Most importantly, I have no clue what jetting is in this thing, that's something I won't be able to determine.  The original carb had a main jet that had a green plastic tube that you could see extending into the throat of the carb, this one has a brass one.  

If you can get the jetting part numbers, you would be able to make the switch much cheaper than I did.  I myself didn't want to modify my original carb in any way, rather just get a brand new reverted one.     

This message was modified Feb 3, 2005 by Richie


Richie
TomP


Once you go Mac you never go back!


Location: Central New Jersey
Joined: Aug 4, 2003
Points: 648

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #17   Feb 3, 2005 5:49 pm
Richie:

Since it is custom do all the replacement/rebuild parts need to come from your contact?

I have a Powerlite that cycles with the idle.  How would I determine if your contact has something where the idle mixture can be adjusted?

Snow Team:

Simplicity 1060 DLXE - Toro Snow Commander / 3650 - Honda HS520
robmints


Joined: May 13, 2003
Points: 4691

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #18   Feb 3, 2005 7:37 pm
M and D

They have mucho stuff. Maybe call and ask.
Richie


Bring On The White Stuff

Location: Long Island, New York
Joined: Dec 12, 2003
Points: 562

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #19   Feb 3, 2005 7:51 pm
TomP wrote:
Richie:

Since it is custom do all the replacement/rebuild parts need to come from your contact?

I have a Powerlite that cycles with the idle.  How would I determine if your contact has something where the idle mixture can be adjusted?


Hi there Tom,

Until actual part numbers can be determined, I'd have to say yes to your question.  Basically, its the same carburetor, only the bowl and adjustable main nozzle jetting are from a pre-EPA design.  For instance, my original EPA carb bowl had the high speed main non-adjustable jet installed, which is that large nut that holds the bowl to the bottom of the carburetor.  On the new one, that part now has a fully adjustable jet (screw on a spring) installed. This is the rich/lean high speed adjustment that makes all the difference. 

That adjustment screw or "main nozzle" may actually be a standard size on most larger engines, but there is also a a second part to it, a colored tube (green colored on my EPA carb) sticking up into the throat of the carb held in place by two O-ring. The new carb has a brass tube.  I think the best thing to do is contact this person and maybe ask him for a kit to revert your carb, or you can send him your carb and have him do it.  I believe he charges $50.00 to boil out the carb and revert it.  In effect, you'll be getting a new carb back in your hands.

There is a special tool required to install and set these components properly.  Better yet, Snowshoveler (Chris) has all the part numbers at his place of work.  Perhaps he maybe he can determine and order exactly what you need rather than pay someone $50.00 to recondition your carburetor.  I also have a carburetor left over from my 25 year old snowblower.  It too had a Tecumseh engine.  The main nozzle adjustment screw looked exactly like the one on my new carburetor, so these parts are readily available.  In fact, this 25 year old carb was an exact duplicate to my EPA and new reverted carb externally, with the exception that this 25 year old carb had no screw recessed to accept the two screws that hold the metal carb box to it.  It doesn't look like Tecumseh does too much to these carburetors except maybe vary some of the linkages. 



Richie
Richie


Bring On The White Stuff

Location: Long Island, New York
Joined: Dec 12, 2003
Points: 562

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #20   Feb 3, 2005 8:12 pm
Tom,

Tim said the part number is, 632334A for the carburetor.  This model is standard on 8-10hp Tecumseh snowblower engines and is adjustable.  Rebuilt they are $50.00 and brand new they are $74.00, at least these are his prices.  Purchasing them from a dealer they could be much more money.

Richie
robmints


Joined: May 13, 2003
Points: 4691

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #21   Feb 3, 2005 8:22 pm
M and D for $78

Sounds like new for less than $80 is not that bad. But if I don't misunderstand, there might be a less expensive list of parts and refit into exsisting carb?
Richie


Bring On The White Stuff

Location: Long Island, New York
Joined: Dec 12, 2003
Points: 562

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #22   Feb 3, 2005 8:48 pm
robmints wrote:
M and D for $78

Sounds like new for less than $80 is not that bad. But if I don't misunderstand, there might be a less expensive list of parts and refit into exsisting carb?

Rob,

You are correct  If you locate the actual parts, it would cost just a few dollars to do the conversion.  If you have the specialized tools to change out the tube inside the carb, you could save yourself a good bit of money.  I myself didn't want to modify my original carb, so I went for a brand new one. 

Richie
robmints


Joined: May 13, 2003
Points: 4691

Re: Replaced Standard Snowblower Carburetor with Adjustable Type
Reply #23   Feb 3, 2005 9:18 pm
This page to start?

Please notice it carries the Stens brand.
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