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Replacement Carb For Older Tecumseh Motors?


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8 replies to this topic

#1 IamSherwood OFFLINE  

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Posted December 06, 2012 - 08:29 PM

Has anyone replaced the Walbro carbs used on the HH series Tecumseh's, with
something better, such as a Mikuni?
How did you deal with the mounting/hole pattern?
How's it run?

#2 DH1 ONLINE  

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Posted December 06, 2012 - 08:54 PM

Ive heard of some using Honda carbs on different engines, but I'm not sure how they hooked up the choke control lever on them.

#3 Fabman OFFLINE  

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Posted December 06, 2012 - 08:56 PM

Interesting question Will. I'v thought about this also and thought i'd make a dual mounting plate .

#4 chris m OFFLINE  

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Posted December 06, 2012 - 09:13 PM

I have had this same thought before. I don't mind the Walbro's as long as they have the high and low needles.

I know I have seen people use the Mikuni's for cart racing and such but I have never tried one.

I like the Carter #26's the best. So if I were to do it I would just make a mounting plate (intake) to make it fit. The #26 and the carb off my HH120 look to have the same size bore in the carb.

I checked the smaller Carter "N" carbs and the bolt pattern is the same as the HH120 engine but the bores on those carb are small, so If I used one it would prob starve for fuel when I had a good load on the engine.

#5 sacsr OFFLINE  

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Posted December 06, 2012 - 09:13 PM

Like your thinking! Hope someone has an answer!

#6 Farmlife OFFLINE  

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Posted December 07, 2012 - 04:59 AM

I'm sure someone has done this before...I'm also eager to know.......

#7 IamSherwood OFFLINE  

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Posted December 07, 2012 - 06:48 AM

Interesting question Will. I'v thought about this also and thought i'd make a dual mounting plate .


I haven't looked, or measured yet, but assuming the mounting holes are somewhat close in spacing, yes
a dual plate would be needed. You'd need 2 plates. First one bolted to the block, using flat head bolts. it
could have tapped holes above and below the port. (1/4" thick).
Second one bolted to that, and the carb to it.

Would spacing the carb out that 1/2" + gaskets, affect performance?

#8 chris m OFFLINE  

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Posted December 07, 2012 - 01:09 PM

I haven't looked, or measured yet, but assuming the mounting holes are somewhat close in spacing, yes
a dual plate would be needed. You'd need 2 plates. First one bolted to the block, using flat head bolts. it
could have tapped holes above and below the port. (1/4" thick).
Second one bolted to that, and the carb to it.

Would spacing the carb out that 1/2" + gaskets, affect performance?

In a good way. When you put the carb farther away from the block it allows the fuel to stay cooler. The cooler the fuel entering the intake port the better the atomization. So a spacer will act as a heat sink for the carb.

#9 LilysDad OFFLINE  

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Posted December 07, 2012 - 01:31 PM

I checked the smaller Carter "N" carbs and the bolt pattern is the same as the HH120 engine but the bores on those carb are small, so If I used one it would prob starve for fuel when I had a good load on the engine.


It's common for pullers to bore out the venturi on the #30s. You could try that, although if you bore all of it out, it will affect low end performance.



Would spacing the carb out that 1/2" + gaskets, affect performance?

The pullers run spacers 2-3" or more. It helps low end torque. 1/2" won't do much though,(other than as stated). Kohler makes a carb gasket that is made out of some kind of plastic and is thicker than normal just for heat control.

I've thought about using two aluminum rings and an aluminum tube just for makiing this kind of carb adapter.

Edited by LilysDad, December 07, 2012 - 01:38 PM.





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