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Some info may be for fun, or to stimulate discussion First topic is one of those.
- Why did some carb bowls support two locations for the bystarter orifice?
- What would trigger Keihin to use one or the other?
- Do you have a carb bowl with the orfice installed in the lower casting location?
- Why did the SB50 move the bystarter orifice lower?
Member lakehouse has been working on an Elite E (SB50) start&run issue. As part of troubleshooting, we got into a question. Is the fuel level in the carb bowl high enough to fill the auxiliary fuel bowl supplying the bystarter? Lakehouse reports a much different bystarter orifice location from models at mousewheels place. Here's photos and measurements:
1) Honda Express carb -- casting shows two possible locations for the bystarter orifice, on this carb, the higher one is used by Keihin. Bystarter location from bottom of bowl ~ 0.75" 2) Honda Aero 50 carb (85-87 series) -- casting shows two possible locations for the bystarter orifice. Again, the upper location was chosen by Keihin. Bystarter location from bottom of bowl ~ 0.72" Honda Spree carb (unknown year) -- casting shows only one possible location Bystarter location from bottom of bowl - 0.55 + 0.10 step up = 0.65"(see pic above, there is a raised floor on the bystarter orifice side of bowl) Honda SB50 carb (member lakehouse provideds info) --
"Overall, the very inside bottom of the fuel bowl to the opening edge of the jet totals out to be 0.280". That's much different from the sister Spree bowl."
Also -- TODO: Check out 94-2001 Elite SA50...