The low cranking voltage is probably contributing to the trouble starting. I have not checked the spark while cold cranking the engine lately. The battery itself is still slightly suspect, because the cranking voltage drops pretty deep, so I will probably replace it anyway. It still never gets above what I would subjectively call about 40% brilliance. The headlight is still quite dim, but it does fluctuate with reving. As I recall, those seem to be reasonable figures to indicate that the alternator is at least working. At idle, battery voltage is about 12.8V, at 2000RPM steady, it’s 14.1. As is the current state of the project, it was hard to get him started and running, but once going and warm enough to idle and run, I had enough hands and eyes to watch the meter. At that point, running lights, instrument lights and the ECU would be the only current draw. I turned on the key and saw it drop immediately to 12.4V then slowly ‘drain’ down to 12.1V after 3 minutes of just sitting there with the key on. So, I started measuring voltages on Buzz.īefore I started, the battery was at 12.6V.
#Megatune for trombonr Pc
In any case, with it settled down and reliably measuring 12v and 5v from a known good PC power supply and 9V from a fresh 9v battery and 15.5 from my laptop power supply, I now feel I can trust it. This meter has bounced around in tool boxes, floorboards, saddle bags and my driveway for about 10 years now, so I think it’s due a little crotchitiness, especially since it’s almost always sitting on the 20V range I found that I could spin the selector switch a few times and make it screw up a bit, but after running through the ranges, it settled down. I turned it on and with nothing connected, it showed 38V. Author admin Posted on NovemFebruCategories 1982 Yamaha Maxim XJ550 Leave a comment on One Step Forward, Two Steps Back Juice and FuelĪs suggested by an XJ lister, I checked over my meter and there is indeed something flaky about it. Just this moment, I’m far too frustrated to safely pull the throttle bodies back out to troubleshoot the stuck open issue, so I will call it a night.
#Megatune for trombonr cracked
That, and broken it such that the throttle is cracked open pretty much permanently. The advance is still crazy up there and it surges like it’s hitting a rev limiter, but at this point, I have done no adjustments to the ECU, just added the subthrottle butterflies back into the intake tract. Well, with the bike trying to idle at it’s maximum attainable RPM of about 3800, the air restriction does not appear to have been too much. I suspect it will be #3 because it seems like it’s always #3. The only thing that comes to mind is that maybe when I put thread lock on the screws, a drop fell in on one of the throttle butterflies, dried there and is now holding them open. I can gently force it against the stop, but it springs back open, reving high the whole time. I reinstalled the throttle bodies and started the bike up, only to find that now the throttle doesn’t close against the stop. After warming the area with some rather colorful language, I removed the throttle bodies, drilled out the broken screw, installed the two remaining butterflies, LockTite’d all of them and finally secured the assembly at the recommended 9 degrees from open. Of course, the first one I tried on the “dark” side of the bike (the side away from the lighting in my workspace) crossthreaded and twisted in half in the removal attempt. I removed the air filters and was able to reinstall two of the butterflies without difficulty. Much remains to be discovered, but I need to start somewhere. I fear the only real option will be to change them out for smaller unit or perhaps build a manifold to let me use only two of them. The butterflies restricting the overall air flow into the engine may serve to widen the throttle range a bit. My theory, verified by his experience, seems to indicate that my throttle bodies are probably way too big for this engine. One step forward, 1.273 steps back…Īs suggested by a XJ-lister with MegaSquirt experience, I set about reinstalling the butterflies for the subthrottles, the intent being to set them to restrict the air intake.
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