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Discussion Starter · #1 ·
I'll make it short. I've been working on finishing my buddy's bike while he's away fighting wars in Iraq and Afghanistan. I got it put together and wired and fired it up. Fresh engine and all. It ran great for a week or so. I upgraded to a very nice S7S carb. It then ran even better! Rode it nice and easy for another week, just slowly breaking in the engine. After a few weeks of babying it around, I felt it was ready for normal riding. I had my wife hop on the back and we rolled over to friends for a BBQ....

So that's when things went South. It started to miss a little, then got worse. Eventually it would't run except at idle. It stack fires and back fires from both cylinders. It can't get any RPM's without sounding like a barrage of cannonfire.

Well, I thought it might be the carb, so I went back to the CV and no change. Then I checked the intake boots. No leaks. I did a compression test and that's good. Pushrods seem to be adjusted properly as well. Points look good, but I can't remember if he had new ones in it when I got it from him. Points spark when running is blue and seems consistent?

I'm at a loss. Does anyone have any ideas? Anyone gone through this before? My friend is coming home for few weeks really soon and I'd love to have it ready for him to ride. Any and ALL help would be much appreciated.
 

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Replace the coil and check your battery with a load tester. It may show that it is charged, but fail when a load is placed on it. I bet it's one of those two.
 

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I had the same sympyoms,turned out to be the coil ,it sporadically made hot enough good spark when it did the unburned fuel set off and created backfire,would run at idle but wouldnt make power cause coil didnt make enough spark,sounds similar .I suppose it may be voltage regulator ,or stator ,or condenser-points. the first thing to do is put new plugs in.hope it works out thanks for being a good friend to one of our finest and good luck
 

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I agree with the coil. I just went through that. When the bike was cold it ran awesome...when at running temp it ran like crap. I replaced the coil and it improved dramatically. I also replaced the springs in my advance weights and new points. Totally different bike now. Runs and idles great when at running temp.
 

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I had the same sympyoms,turned out to be the coil ,it sporadically made hot enough good spark when it did the unburned fuel set off and created backfire,would run at idle but wouldnt make power cause coil didnt make enough spark,sounds similar .I suppose it may be voltage regulator ,or stator ,or condenser-points. the first thing to do is put new plugs in.hope it works out thanks for being a good friend to one of our finest and good luck
I completely agree. Definitely ignition related. Sounds like it's getting plenty of fuel.
 

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Start with some new plugs, Autolite #4265 . I tried fancy pants plugs in my shovel and when they went bad, it was like the 4th of July coming out of my exhaust!
 

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Discussion Starter · #12 ·
OK, I'm gonna go pick up some new plugs. I have an Accel supercoil, but it's a 4 ohm unit that I got for my Triumph, so I don't think that installing it on the Shovel is going to help me out. I will try to source a replacement coil locally, but if I strike out, does anyone have one I could buy? Just checking.
Thanks for all the advice and help to all of you. My friend is going to be stoked if I get it going. He's Special Forces and been through Hell and back. Seems the least I can do to get his machine rolling so he can blow off some stress and troubles with his knees in the breeze.
 

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replace the condenser you must have converted it over to a points system ????? replace it condensers will do that after they get warm an start to break down, Been through that many a time
 

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Discussion Starter · #14 ·
SUH-WEEET!!! I think I found the culprit. One lead going to the coil was frayed and grounding on the rear head!! This is so good. I'm very happy for my friend. Gonna go fix it up and fire it. Will check back and let you all know how it worked out.
 

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Discussion Starter · #15 ·
Still doing it, but not as bad. Damnit. Better get those plugs and put the S&S back on it then see what happens.
 

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Discussion Starter · #16 ·
To all concerned, it seems to be back to normal. Replaced the condenser, reset points gap, new plugs, reset timing and she fired up real nice. My buddy is gonna be stoked to ride again. Hell, anything is better than Ass-crack-istan. Thanks for all the advice and help.
 

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Discussion Starter · #19 ·
Thanks, Spartan. I'll check it out. I'm having some issues with the clutch, so if I need anything I'll look him up.
 
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