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Join Date: Jul 2006
Location: Kennett Square, PA
Which ports to block, which to leave open? (last-ditch effort)
Duck talked me into giving the ol' girl one more try, since the engine is running on starter fluid, I'm just not drawing fuel from the carbs. Here's the thing: Previously, I had the carbs hooked up to the engine block (altho' Duck suggested I get a new hose clamp for the rear boot - done), and that was about it. No airbox, no air filters, no emissions cannister, no hoses, no pipes, no premuffler chamber. At his suggestion, I've put the carbs back onto the engine block and have reinstalled the pipes, goat, and the mufflers, in an effort to see if increasing the back pressure will draw the fuel out of the carbs and into the combustion chamber. As we got to talking, though, we couldn't decide what to do with the reed valve ports and the vacuum ports.
I had blocked off all four - I was either putting fuel directly into the lines, or drawing it from the tank (but had modded the petcock to a gravity feed, so no vacuum was required to pull fuel out of the tank). But, if I put fuel directly into the lines, what do I need to block off to ensure that the engine has enough vacuum to get the fuel out of the float bowls and through the carbs?
So, at this moment: carbs are connected tightly to the engine block; pipes, goat, and mufflers are on; no airbox and no airfilters (slides are, in effect, open to the air); crankcase breather hose is still attached... and vacuum ports and reed valves are not blocked off; and I have no emissions hoses (two to the reed valves, one to the airbox, one ot the rear vacuum port) anywhere near the bike. And I'm just gonna dump fuel directly into the lines on the carbs... what's gets blocked? What remains open? And, just for my edification, can someone explain why?