paso750 wrote:guys you freak me out. Stop poking in the dark, do it with a system. This topic is going on for two months. Finding the problem shouldn´t cost more than a weekend. The Pantah is not a complicated engine. Finding a problem on a 907ie can be for sure more complicated.
It is running now, once I fixed the broken alternator wires.
Nah, Higgy had it right, giving me the right problem solving strategy. Two months, because I was overseas for one month and had two weeks break after a fire, so in reality it took two weeks to fix - yeah, well, I'm on a learning curve, aye.
Warwick, stop changing things. You´re making it more complicated to find the problem, you may even create new ones
Sure, I a made a new problem while putting in new coils, but that is a separate system form the starter motor-cranking question, aye. Since it was a separate system then I it didn't make it more complicated to find the problem.
starter motor-cranking question was fixed when I replaced the Solenoid.
Okay, then maybe I should have started a new post for "coil related not starting".
and please don`t constantly edit your posts, just post again. I always have to read your old posts again to see that there were things changed or added.
Okay, but what about the top/first post. I thought it was helpful if I edit the top post like a summary? That makes it easier for readers to see if what's below would be of interest, instead of searching so much.
As for every gasoline engine that won´t start there are three very basic main possible issues: no cranking, no fuel or no spark.
We learned it does crank.
Yep, it cranked once I put in a new solenoid
So, now onto the coil start system...
If you disconnect the fuel line to the carb and turn the ignition on you`ll see if the fuel pump squirts fuel through the line. If it does and not only a few drops things are fine. The carb could still be an issue but if after some cranking the spark plugs are wet that´s fine, too. If the bike stood for months or years old fuel can be an issue (not in your case).
Yes, I get understand that. I did that and double checked the carb wasn't blocked by checking the fuel was squirting through into the venturies.
Spark. If there´s none trace backwards. Check the spark plugs, the plug wires (an analog multimeter should basically show a short), measure the coils. Unless you modify things here there`s no need to check polarity or if the coils/cylinders were connected reversed.
Yeah, I had reversed the coil wires - dumb
If as higgy states at least 10V arrive at your coils they should fire. Your battery should be fully charged of course.
yes more than 10 volts, but didn't fire, so Higgy said check the wires back from coils to battery. Voila, found broken wire.
If all that shows no result measure the output of the pick-ups. (check pick-up/flywheel clearance and pick up bracket marks - if nothing was done to these parts this is not necessary)
If this is also all fine I`d have the Marelli Digiplex tested somewhere.
Luckily I didn't need to as when checking wires back from the coil and found a broken wire from the ones out of the alternator. The fire had melted a bit the tape where there was a connection and I had wiggled it wondering if I needed to unwrap the partly melted tape. I think in doing that I must have broken loose the last strands of wire holding the connection. When I uncovered it one wire was half gone at the connection and the other was broken.
Of course there can be more which brings me back to my last unanswered question. What were the things you did on (or should I say to) the bike after the last time the engine still worked ? Assuming all the above is ok this`ll only leave incorrect ignition timing which could come from attempts to adjust it, incorrect belt change or replacing the belt pulleys. Did you do any of this ?
Only I had cleaned the starter switch.
(A clogged fuel return line will only show effect after some riding, not when starting a cold engine. Stuck valves on both cylinders are imho unrealistic).
The spark plugs are not your issue. They will either fire or not. If they work well with the ignition system is another story, but for the engine starting or not starting that`s irrelevant (Iridium NGKs didn´t work at all on my 750, the 906 or 907ie may handle them better).
Btw. the RA6HC are for the 750 you`ll need the RA8HC.
Yes, I understand. The spark plug testing and adjustment is more about fine tuning than basic starting issues.
There`s no need to fiddle with your wiring now unless you changed it after your last ride or if it was damaged by your little fire mishap.
Exactly, since fixing a wire solved the problem I conclude that the
fire made a small amount of damage to a wire connection that was anyway a problem about to happen.
If you want to know if your alternator works measure the voltage over your battery with engine off and then start it. Voltage should go up for 2 volts or so. If there`s no change it`s no good sign.
Good to know.
Thanks for the explanations. I learned a lot on this learning curve.
G.[/quote]