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

These are the sounds issued forth from my beloved Tecumseh engines equipped with fixed Jets. I don't own one but my friend does on a machine I recomended and he constantly rags me about it. In an effort to get him off my back I have researched the following and these are the results:

1) The replacement carb for a medium frame Tecumseh is 632334A ( this is a part # that replaces a disontinued part but the blow up diagram of the replacement shows an adjustable main jet. Therefore I ASSUME it is adjustable.

2) The carburetor repair kit for this model is 632347 

I was able to secure a blowup diagram of this carb and the list of parts in the repair kit. It APPEARS all of the main jet parts are present in the kit.I NEED VERIFICATION If this includes the needle and the jet. 

If one were to remove the fixed jet from the current carb which I believe is the green plastic tube held in by O-rings and replace it with the adjustable jet and needle from the #632347 repair kit would it work? Could you retrofit the new bowl with the adjustable assembly or would you have to buy a new bowl?

If anybody could verify or correct my assumptions I would be most appreciative.

Marc

Just for the record -theHonda GX series engine on my power washer made the same spit, sputter,cough,blemph sounds due to it's fixed jet carb. Honda has addressed this problem by producing a line of altitude related jets. Another words if you want to richen up a Honda fixed jet carb parts are available. The carb will still be fixed jet but at a richer setting.

Let me qualify that a little bit.

Yes, I would like to see engine manufacturers have the true HP ratings of the engines, advertised. What I don't really care about is a class action law suit, I have no need for that myself. As long as the spec's are published and easily found, I'm good to go.

Actually that is what some of us are saying you may be actually getting. less choices than actually implied by the seller

A choice between 8 and a 13. (over 50 percent in BHP between the two almost identical engine. however the rasting is at  a much higher operating rpm that the machine can't run at with a governor)  Big bucks in the differences, sure some more features, which does kind of camoflague and confuse the issue,  There is still a big free percent left over for the engine charge going back to the MFG for the low cost internal slight carb differences. 

also when you run them under load and rpm, drops to peak torque RPM  and you will find that there is no where close to a 50 plus percent increase in power between them there.  So do you actually have like five choices or do you only have in essence only like two?  

Ben07

Marshall wrote:

100 percent agreement  (relavent specs)

 Richie,

How much of a HP increase did you think you got with your

 new carb on your 8HP engine??

Also, what is the part number on the carb, or is it top seceret??

                                                                       Fred   

jubol wrote:

Hi there Fred,

I think it was a great answer to his question. 

 Richie,

 Thanks for the numbers.

Also when you were at the Tulsa engine site, did you check the specs on the Tec HMSK 8, graph shows about 6.4 HP out of 8.

The 10 shows 8HP, which is about a 20% loss due to the EPA carb.

I think that your good carb got you back at least 1 HP,  maybe more, so now your 8 is at least about 7.4HP.

                                                        Fred  

jubol wrote:

Fred,

I'd have to verify the graph you are referring to, but I believe that is the one I have.  As for additional HP due to my adjustable carb, it stands to reason something good came out of it, beyond the fact it runs better, but what makes me hesitant about me commenting further is the fact these engines run at a governed speed.  For whatever it's worth, if I had to do it all over again, I'd still make the carb switch

Marshall, if you were referring to me in the way I answered Fred's previous question about HP verses the new carburetor, thanks.

I was sir, and you're welcome!

What is also fish about that tulsa site they will only give you one full graph of the hp to torque chart per category of same cube engines  I.E. are both 19.43 cubes.  so no graph on the nine.  Strange also important to notice two reference points on the graph,  operating rpm on my 8 hp is 3600, under load it can drop to 2800.  at 3600 it developes 11.5 ft pounds of torque and at the lower rpm it increases to 12.9 foot pounds.  however it looses the meaningless HP number as it decreases by like 1.25 hp  .. Torque is much more important ref  here and it is what is keeping the engine runnin under load Would be willing to bet the nine developse it's hp at a higher rpm above 3600 and it could be very well the same engine  that has the same torque at the 3600 and the 2800 rpm's  .  bore an stroke are the same cept seems they decided to write one of them in decimal and the other in SAE.  same weight to the motor etc,  everything they do always looks like a shell game. 

If it looks like a duck

an walks like a duck,

maybe it is a duck

Ben07