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Post by zambia on Sept 3, 2007 19:58:59 GMT -5
No. I still have it, but the engine is running like a turd. Last ride (a week ago) it ran awesome. This afternoon I fire it up (2 kicks), let it warm a minute and take off. It always sputters for the first few seconds, then runs great. Today it started missing and back-firing. I pull over and change the plugs (which looked good..leaner than usual but no too lean). Same result. Come home, put in brand new plugs and rip around the neighbourhood...same thing. This time I notice the centre plug (which is firing) is bone dry. No oil on the threads, nothing. This is weird. In the garage, I'm revving the snot out of it..centre cylinder back-pressure feels a bit weak, but it is firing.
Any ideas? I don't have any proper tools for checking the ignition box.
Thanks,
ian
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Post by Deleted on Sept 3, 2007 21:21:01 GMT -5
Hi Ian Maybe because the center cylinder is dry, you might not be getting any fuel to the carb. Have you checked the center carb to see if the cable has come off? Fuel lines plugged? Just throwing a few things in the air Ian. brawney
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Post by zambia on Sept 3, 2007 21:28:16 GMT -5
Could be. It sounds like an electrical miss, but it looks like no gas is getting to the cylinder..I guess that would also explain the weak firing.
Thanks Wayne, I'll pull the carb tomorrow, and keep you posted.
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Post by zambia on Sept 4, 2007 20:14:27 GMT -5
Anyone else have a guess? And should I worry about oil starvation since this thing runs pre-mix...if there's no ga sgetting to the centre, I guess there's no oil?
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Post by tripletriplenut on Sept 4, 2007 20:29:44 GMT -5
if it wasn't getting fuel then it is not under any load and will be fine Johnson figured out that they do not need any oil under 1800 rpm under load. there engines go into limp mode to get a engine home with no oil injector.you should be fine.
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Post by Deleted on Sept 5, 2007 17:20:00 GMT -5
temporarily try swaping a carb from a running cyl to the dead one and see what happens. if the prob moves wiih the carb ........
If the prob stays on same cyl then we'll go from there. CDI Electrical issues and testing cdi components are out of my league but there is this guy I know from Ayr (north of Paris and east of Washington) that's very knowledgable with H2's and I'm sure could look at electrical stuff if and when needed
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Post by zambia on Sept 11, 2007 16:44:53 GMT -5
OK swapped the carbs Sunday...the problem stayed in the middle cylinder. It's weird, the bike idles ok, but over 4,000 rpm, it dogs and misses..the back pressure on that pipe is weaker for sure. I reset the carb sync so all the slides open the same. Tonight I'll pull the "b" iggy box from the '72 and try that..but I'll be surprised if that solves the problem. I hope I haven't lunched a piston or something, but a bone dry plug is weird in a 2 stroke.
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Post by Deleted on Sept 12, 2007 12:33:28 GMT -5
Hi Ian I was reading through some threads on another board. The topic was about fuel taps. Another person was experiencing no gas to the center cylinder. It was suggested that maybe the four hole rubber gasket may be the culprit because of deterioration of the rubber. If your fuel lines are long enough try swapping the fuel lines Right line to center line , center fuel line to right fuel line. If your right cylinder starts acting like the centre used too then its possibly the fuel tap. Just a suggestion if you have not already ruled out the fuel tap. brawney
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Post by zambia on Sept 12, 2007 13:23:50 GMT -5
Wayne, good thought...I would never dream of that to be honest. In this case I have a Pingel which I think has no rubber in it..not sure. Anyhow, I swapped ignition box off my '72 last night (just the center one) waited for the rain to subside..and took it up the street. Seemed better at low rpm, so I gradually wound it up in 2nd. Suddenly it hit the power band and the back tire broke loose on the rain slick road! Holy cow, I almost fouled my pants...the engine was screaming at 9,000 and the rear tire was beside my right knee Anyhow, I gathered it up before I hit the ground - stupid, stupid. Bottom line is it did run a little crisper, and I had better back pressure and a little gas on the plug. Next I'm swapping the rectifier..who knows? ian
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Post by Deleted on Sept 12, 2007 14:04:51 GMT -5
Hi Ian I have a good memory but it is short. I forgot you had those fancy Lectrons carbs on the H2C. ;D brawney
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Post by zambia on Sept 13, 2007 7:22:00 GMT -5
OK, I've traded the rectifier..and still not smooth. Could it be a bad wire or something on the stator? I don't want to swap that off my '72 if I can help it. Would there be a way to tell - with the bike running and the stator cover off..if I'm getting weak power? And is it possible that if there's a problem that's why I have one weak cylinder? Sorry, I don't really know how those thing work (beyond the basic principle).
I need a mechanic....anyone? Anyone make house calls for free ribs, beer and $$?
ian
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Post by Walms on Sept 13, 2007 8:29:02 GMT -5
I can drop in for ribs and beers.... but I doubt I'll be able to help with the electrical problem though, electrons are not my fortae... ;D
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Post by tripletriplenut on Sept 13, 2007 8:57:22 GMT -5
switch the left coil electrical positive wire to the center coil and the center coil positive wire to the left coil and see if the problem follows it if not then it is not the coils and if it does then it may be a trigger coil.if it does not follow it may be mechanical
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Post by tripletriplenut on Sept 13, 2007 9:02:28 GMT -5
skirt on the center piston is not broken off at all how about scouring?
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Post by zambia on Sept 13, 2007 9:13:46 GMT -5
switch the left coil electrical positive wire to the center coil and the center coil positive wire to the left coil and see if the problem follows it if not then it is not the coils and if it does then it may be a trigger coil.if it does not follow it may be mechanical You can do that, and it will run? I'll try it!
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