Mr. Big wrote:
New here but always up for a Linkert discussion. The M88's bowl is internally vented which is why the OEM venturi has a notch at the bottom leading edge. I've never seen an 1-1/8" venturi that is notched. I believe all the other 3 bolt Linkerts (HD models) are externally vented so that venturi would work for them. Might could notch it to make it work but others here would know better about that mod.
As Dal posted, the "notched"1 1/8" venturi was spec for all Indian Bonneville models.
Off-topic, but one enigma about the Indian Bonneville models is that the carb bodies and carb venturies were listed in the 1940 parts listings, however no such Scheblers have surfaced in the "fossil record".
Linkerts, with proper Bonne specs, are commonly accepted to first appear upon Indians for the '41 production year.
It is anybody's guess as to how the Indian Bonne nozzle will perform.
It varys only from the "performance" H-D M75 nozzle (not shown in Palmer's
) by a larger center bore, and less charge volume for accelleration.
These things are extremely forgiving (otherwise I would be pushing a broom), the variables are infinite, and without a dyno with an unusually gifted operator, the results damn subjective.
My only extreme experience with incorrect nozzles was when a Chief would quickly overheat at highway speeds with an M51 (1/16"), whereas bolting on an M344 (1/16") cured it, with no other variables changed.
The major difference between the two models would be the nozzles; The standard (non-Bonne) Chief's has a large hole at the bottom, then a slightly smaller, then three small holes. The H-D Flatty nozzle has only four holes, all small. (Curiously, it is also used in the tiny Indian 741.)
Since both Models 51 and 344 were designed for 74" Flatties, one must assume that there is truly enough other differences in the motors to require radically different metering at the nozzle.
So Dal, my question would be:
Just how radical is your motor? More
radical than a ULH?
One other difference between Indian and H-D models was the "titted" idle bleed well cap.
My best guess is that it was perhaps just a "bubblebuster", but plumes of soot upon it suggest it affects flow and mixing in other ways.
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