73G-nose Posted September 6, 2008 Share Posted September 6, 2008 Trying a first start on a brand new motor. Have factory fresh Weber 45 dcoes on a TMW manifold. Fuel pump is a Carter 4070, making 4 psi with pump running. Float level and jets are as delivered, except for a change to 165 main jets. Timing has been checked several times. Fuel is reaching carbs, and is dripping from bowls. Engine will fire, but won't catch...plugs removed and are bone dry. Fuel doesn't seem to be sufficiently reaching the combustion chamber. Using the chokes had no effect. Am I missing something obvious here? Thanks for any and all advice. Quote Link to comment Share on other sites More sharing options...
jay28 Posted September 7, 2008 Share Posted September 7, 2008 This might be silly, but are you sure your plug leads are in the right firing order? Quote Link to comment Share on other sites More sharing options...
73G-nose Posted September 7, 2008 Author Share Posted September 7, 2008 Latest update: Removed carb 1 to verify accelerator pump operation...no fuel squirt from pump jets when butterflies pumped. Accelerator pump linkage bound up...lubricated linkage and was then getting fuel squirt during throttle pump. Float level checked out okay, main jets clear. Reinstalled carb 1, removed bowl covers on carbs 2 and 3, verified accel. pump linkage was free on both. Ignition on, pump on...end result same. Intermittent firing but no start...plugs still dry. Still seems to be something amiss in the carb starting circuit. Hoped to avoid pulling all three carbs off the manifold for a teardown, but now it seems unavoidable. Quote Link to comment Share on other sites More sharing options...
PanzerAce Posted September 7, 2008 Share Posted September 7, 2008 Why would it be the carbs? You said that they are delivering fuel. Check your firing order first I would say, and then maybe if you are even getting enough power to the plugs. Quote Link to comment Share on other sites More sharing options...
73G-nose Posted September 8, 2008 Author Share Posted September 8, 2008 Got it started. Had to do some further massaging to the accel. pump linkage, now getting a decent pump shot into the intake. Just as an FYI, the ignition is a new Mallory Hyfire 6AL with matching coil, so spark strength was not one of my concerns. These carbs were purchased through TEP, and I don't know if they were drop-shipped or came directly from their inventory, but wherever they came from it appears they had been on the shelf for quite some time. Thanks for the replies. Quote Link to comment Share on other sites More sharing options...
DAW Posted September 17, 2008 Share Posted September 17, 2008 You are using the start enrichment circuits on the carbs (all three should share a common actuating cable which runs inside to a pull-knob in order to cold-start the engine)? DAW Quote Link to comment Share on other sites More sharing options...
wondersparrow Posted November 11, 2008 Share Posted November 11, 2008 I dont think I have ever seen the start circuits hooked up on dcoe's. I usually just have to give it 2-3 good pumps on the pedal and she starts no problem. With the cam/compression I have it takes a while to be warm enough to go far, but it starts ok. Quote Link to comment Share on other sites More sharing options...
LowCarbZ Posted November 11, 2008 Share Posted November 11, 2008 I dont think I have ever seen the start circuits hooked up on dcoe's. I usually just have to give it 2-3 good pumps on the pedal and she starts no problem. With the cam/compression I have it takes a while to be warm enough to go far, but it starts ok. I'm in the same boat here. Choke on, couple of shots with the pedal and it'll fire up even on the coldest fall day. It's a bit tempermental until warm but that's to be expected when it's chilly out. Quote Link to comment Share on other sites More sharing options...
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