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No spark...coils?

  • Thread starter Thread starter mindtrip
  • Start date Start date
mindtrip said:
Replaced the plugs. Still not getting over 5k. I am completely stumped. Replaced all the o rings and intake rings. Bike starts and idles, and trails off and dies. If I open the throttle its hesitant to rev but when it does it only gets up near 5k.
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Lucky me , I just reread this whole thread while sipping a beer! Time to check your ignition advance and make sure its not frozen after all this time. Remove signal generator cover, reach in and check that rotor moves freely and returns. If timing was stuck on 10 degrees advance, engine would not be happy over 3000.
 
just checked that out.

you're talking about the little tab on the post that turns down and pushes those plates out right? seems to return just fine..if thats what youre talking about.
 
mindtrip said:
just checked that out.

you're talking about the little tab on the post that turns down and pushes those plates out right? seems to return just fine..if thats what youre talking about.
Click to expand...
Yes, so it's advancing Ok.This bike is very stubborn! When you dismantled and cleaned carbs, how did the diaphragms look? As throttle plates open, the carb pistons need to get pulled up by the diaphragms' vacuum.
 
The diaphragms looked good. When I push on the slide up it makes a suction sound and returns back down nice and smoothly.
 
I have the box on but the element that came with the bike disintegrated. Im sure it will run smoother with that on, but im still concerned with the backfiring.
 
mindtrip said:
I have the box on but the element that came with the bike disintegrated. Im sure it will run smoother with that on, but im still concerned with the backfiring.
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Some folks here think that having no element would cause problems as you rev to 4k. My bike starts ok with no element-this is how I bought it- but I don't know if it would rev smoothly this way. A tight airbox with element slightly lowers the pressure holding the diaphragms down-i.e., it's easier for the engine vacuum to lift the carb pistons . You might be able to restrict air flow to airbox by rigging up a crude filter-just make sure it doesn't get swallowed.
 
alright guys i made my own air filter out of a sock, completely modified for cafe racing :) j/k
anyways, i got the boots all right and tight and i fired her up and she idles nicely. only problem is i did the hand test on the header....wouldnt you know it, i dont have ignition on cyl 3 and 4. wtf is that? I have spark. No gas getting through?
 
mindtrip said:
alright guys i made my own air filter out of a sock, completely modified for cafe racing :) j/k
anyways, i got the boots all right and tight and i fired her up and she idles nicely. only problem is i did the hand test on the header....wouldnt you know it, i dont have ignition on cyl 3 and 4. wtf is that? I have spark. No gas getting through?
Click to expand...
So...two months have gone by. What's the status of your freebie? Did you get it running on all four cylinders? Have you gotten your hands on a carb synch gauge?
 
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