cold blooded 1810
 

Hey guys, still learning my way around my 1810. You have been a big help so far!!! The M18 seems to be in need of a coil, it breaks down under load. With that still on my "to do" list, I now find that where the engine ran fine at idle in warm outdoor temperatures, it is now tough to get it started, and even harder to keep it running now that the temperatures are in the 50's. Must constantly play with the choke to keep it running. I suppose this is not typical of this engine since you guys regularly use them for snow duty. Do you think this is the coil is complaining again, or should I plan on a carb rebuild also?:bigthink: It has the Walbro carb.

Sounds like the carb to me. I would junk it and find one of the better adjustable ones.

AJ

AJ's right. Walbros are good for paper weights. Find yourself a nice used carter carb, rebuild it, and you'll be good to go.

i just rebuilt a carter 26 to fit in my 1811.
used the throttle shaft and plate from the walbro so the linkage would line up.
she now runs smooth and steady with no hunting.
good luck with your project.
Dan

That's one of my questions. Am I looking for a "30" carb? And do I need to also get the linkage for the 30, or will it also accept the Walbro throttle shaft as Dan did with his?

No, you need a #26. The walbro throttle and choke shaft should work.

i believe the 30 carb has a bigger venturi and will be too big of a diameter where the stock walbro throttle plate goes.
the #26 carb is adequate to run the 18 mag engine.
i have my load needle out about 2 3/4 turns.
Dan

is #26 cast inside the throttle bore? Thanks!:cub10:

Carb Size / ID
 

Grand Pops 1810: I think that the "26" and the "30" refer to diameter of the carb throat in millimeters; that is, the 30 carb has a 30mm throat and the 26 carb has a 26mm throat.

Personally, I'm surprised to learn that my 18 HP twin cylinder engine uses a smaller carburetor than my 14 HP single cylinder; but I trust the people telling me. :)

That's because it feeds the cylinders one at a time, and the bore and stroke of the M18 is less than a K241 10 hp engine.

yes, look inside past the choke plate at the top.
the numbers stand proud of the surface .
Dan

FWIW:
I agree with replacing the Walbro, I never liked them.
You might try removing the bowl and cleaning things up a bit, and you may fine it helps or even works ok.
It would only cost your time if you are careful with the bowl gasket/flange gskt.
then you could take a little time to find the carb you want that is adjustable.
Sometimes just a little crud plugs things up.
Luck!

Okay, that sounds like plan A, give the Walbro a cleaning and inspection to see if it will run right. And in the meanwhile, start looking for a #26 (plan b) to have one on hand if/when I decide to bail on the walbro.