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Other Honda Mini Trails
CT90, CT110, ST70, ST90 Discussion
Getting a CT110 Carb on an ST90
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<blockquote data-quote="69ST" data-source="post: 178824" data-attributes="member: 5"><p>Without seeing the actual parts involved, I cannot give you specific cutting advice...and have it mean anything. Parts, such as that airbox, are a lot easier to cut than to replace, if cut incorrectly. </p><p></p><p>That said, some general guidelines that are useful. If there's going to be a size mismatch, then the IDs should get larger, downstream from the carburetor (i.e. intake same size, or larger than the carb, intake port same size, or larger, than the intake), to realize maximum airflow and without unwanted turbulence. Upstream of the carburetor, ideally, I like to see at least the same ID as the airhorn of the carburetor; that not only insures unrestricted airflow but also keeps the airbleeds (located inside the airhorn/inlet side throat) fully exposed to uniform airflow...which insures proper fuel deliver delivery, at speed. Now, Honda sorta broke that rule, with the CT70; the inlet side airbox boot had a restrictor cone with an ID similar to the carb venturi itself. Keep in mind that the outlet side airbox boot, the one that attaches to the carburetor was larger than the airhorn/throat ID. </p><p></p><p>What size is this carb, what was the original? Those dimensions are critical. If you want to remain on the safe side, then I'd suggest keeping the ductwork, between the airbox & carburetor at least as as larger as the carb airhorn/throat inside diameter. Looking at your photos, it appears that the opening on the airbox...the one into which the rubber hose fits, is at least 22mm; the question is what's the ID of the hose that fits inside of it?</p></blockquote><p></p>
[QUOTE="69ST, post: 178824, member: 5"] Without seeing the actual parts involved, I cannot give you specific cutting advice...and have it mean anything. Parts, such as that airbox, are a lot easier to cut than to replace, if cut incorrectly. That said, some general guidelines that are useful. If there's going to be a size mismatch, then the IDs should get larger, downstream from the carburetor (i.e. intake same size, or larger than the carb, intake port same size, or larger, than the intake), to realize maximum airflow and without unwanted turbulence. Upstream of the carburetor, ideally, I like to see at least the same ID as the airhorn of the carburetor; that not only insures unrestricted airflow but also keeps the airbleeds (located inside the airhorn/inlet side throat) fully exposed to uniform airflow...which insures proper fuel deliver delivery, at speed. Now, Honda sorta broke that rule, with the CT70; the inlet side airbox boot had a restrictor cone with an ID similar to the carb venturi itself. Keep in mind that the outlet side airbox boot, the one that attaches to the carburetor was larger than the airhorn/throat ID. What size is this carb, what was the original? Those dimensions are critical. If you want to remain on the safe side, then I'd suggest keeping the ductwork, between the airbox & carburetor at least as as larger as the carb airhorn/throat inside diameter. Looking at your photos, it appears that the opening on the airbox...the one into which the rubber hose fits, is at least 22mm; the question is what's the ID of the hose that fits inside of it? [/QUOTE]
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Other Honda Mini Trails
CT90, CT110, ST70, ST90 Discussion
Getting a CT110 Carb on an ST90
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