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Just a word of caution on that Tillotson carburetor – it was made prior to 1930, which is when the diecasting industry got around to adopting some alloying standards that improved the castibility and longevity of the zinc alloys they were using to make various parts. Many models of Tillotson carburetors used on motors built in the 1927-30 time frame were notorious for breaking down and comping apart. The MS-20 carbs used on the Indian Silver Arrow as well as many Evinrude models were known for disintegrating over time even if the motor wasn’t being used. The weakest points were the throttle and choke quadrants and the float bowl. The float bowl in particular was a bad spot, if a person was the least bit careless when it came to tightening up the fuel fitting, the entire side of the float chamber wall would break right off, rendering the carb completely useless.
Two broken pieces from two different carbs, but t he fracture lines are similar, suggesting repeatibility
I have retrofitted the Tillotson MS-45 and MS-45A carbs onto many motors that suffered broken carburetors because of the “zinc rot disease” (proper name is “inter-granular corrosion syndrome”). So handle any Tillotson carburetor of that era with kid gloves, and use two wrenches to tighten the fuel fitting onto the fuel bowl – one to tighten the flare nut, and the other to support the elbow that you’re tightening the flare nut onto.
PM T2
He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...
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MS4B Would be an original 1929 carb. number and known to be the one that crumbles. I also have a complete survivor but won’t use it for that reason. The numbers you’re looking for are the MS-45A & MS-45B, used on the Neptune OB-2, OB-3, OB-4, OB-5, OB-31 OB-32, OB-51, OB-61 & OB-63 from 1929-35. BUT you want one from the later models as the early carbs have the same issue. I believe the MS-45C, & D, from 1936-37 are also the same carburetor. This model is made up of parts from other models. From a failing memory I believe only 3 parts were manufactured to make this motor. The drive shaft from the crankcase to the impeller. The muffler. It looks the same as the N but its not. And the tiller assembly that connected the power head to the folding assembly. These motors are not rare but they are uncommon. Here is a link to a video I did on these a couple years ago. https://youtu.be/i9NiPC126fY?si=Y2HmmgQTwk4ooo01
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
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