https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?board=pubmc The Autonerdz Community Forums en-us The Autonerdz Community Forums Sat, 14 Nov 2026 13:43:29 GMT http://blogs.law.harvard.edu/tech/rss YaBB 2.5 AE Revision: 1.29 30 https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1739827440 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1739827440 Wed, 11 Mar 2026 20:27:01 GMT My 2 cents. You mentioned backfire, which I'm old school and is usually lean burn or out of time. One thing I noticed here and admittedly I'm not very good at it but the burn time. It would appear to me that the burn climbs rapidly up and sometimes eratic but usually from what I know it is running out of fuel (I.E. lean). Also notice burn signature and appears to be a traditional ignitions as the burn time is just shy of 1second. I would lean toward a adjustment screw in the carb or cleaning it. Voltage at the battery looks solid to me. <br /><br />Larry https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1742405565 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1742405565 papaslop@yahoo.com (HarleyMike) Tue, 25 Mar 2025 20:10:27 GMT <a href="https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1742405565/1#1">HarleyMike wrote</a> on Mar 25^th, 2025 at 4:26am:<br /><div>Cant seem to download your file?<br /> </div><br /><br />O.K, I have been watching Group Therapy  ( great job, everybody) the topics were interesting.<br /><br />I will check the Drop Site for the files. They must be to big to post. https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1727889152 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1727889152 Trevor@autonerdz.com (TrevorSchlientz) Mon, 7 Oct 2024 19:56:21 GMT +1 to Everything already stated. <br /><br />I would also look for a known good on a similar bike. <br /><br />Also, keep practicing with the scope on good working machines so you can learn what good looks like. <br /><br />Can you post your capture so we can open it in Picoscope? https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1538323242 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1538323242 Sun, 30 Sep 2018 16:00:42 GMT Hello again, I've something of an inquiry. Does anyone of you know or someone you know the ecu pinout for a 155cc yamaha nmax? or a yamaha smax?<br /><br />I wanted to scope the injector for amps and voltage but access to the injector and other sensors/actuators is time consuming because I have to remove almost all the fairings. On the other hand, access to the ecu is a matter of opening the compartment and removing 2 screw for the ecu cover. https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1533924945 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1533924945 Tue, 14 Aug 2018 15:02:00 GMT Yeah, no webb belt in the picture. I used an old claymore bag to carry mine in, usually about 30 mags if I could get them. https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1529960977 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1529960977 Fri, 27 Jul 2018 06:12:50 GMT Yes I agree. Something sheered in the pump.<br /><br />That's the way it goes sometimes but it also shows that sometimes fault codes can lead you up the garden path. I spoke with the owner a few days ago and he's covered over 500 mile with no issues. In fact he said it's starting better than it ever has. So that's good news. https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1532576155 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1532576155 Thu, 26 Jul 2018 17:26:25 GMT I fully agree this tests invalid but this waveform is a good known waveform. All cylinders were manually pressure checked and all with 5psi of each other. https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1516979916 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1516979916 Fri, 9 Mar 2018 14:54:29 GMT lE-CHUM, THE JET I forgot the name of is the Pilot jet. And many times if the problem persists even with stock jetting you have to go to a bigger one or bore out the one you have.<br /><br />Goes from Idle, to pilot, then main and should be a smooth transition. If pilot is (to small or plugged)  will back fire coming down instantly from full throttle as shutting off main jet if pilot is compromised the lean condition causes a back fire, then goes into idle jet, and if the shut down is too erratic might stall, but not usually.<br /><br />The back fire is caused from the burn time being (so long) from a lean condition that firing event is still happening when Intake valve opens or in case of 2 stroke into intake.   The other case of course is if timing is off, but back fire for me at least usually involves one of the two.<br /><br />The other down side of plugged pilot jets is running high RPM say down a Mountainn and turning off throttle you spend a lot of time in a serious lean condition which causes an over heat as engine RPM is still high, so yes need it fixed.<br /><br />Have fun. https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1487131761 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1487131761 Wed, 15 Feb 2017 16:00:35 GMT <b>This <a href="https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1487131762/0#0"><b>Topic</b></a> has been moved to</b> <a href="https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?board=PGMC"><i><b>Picogroup Motorcycle Discussion</b></i></a><b> by <i>Brian Haley</i></b> https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1479182168 The Autonerdz Community Forums/ https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1479182168 Sun, 18 Dec 2016 14:38:19 GMT <a href="https://yabb.autonerdz.com/cgi/yabb2//YaBB.pl?num=1479182168/2#2">James H wrote</a> on Dec 11^th, 2016 at 5:17am:<br /><div>I concour with your thougts on this. Assuming this is a 4 stroke the other possibility is a leak at the headpipe </div><br /><br />James, yes just assumed it was a 4 stroke and we know how dangerous that can be , Assuming.  The only 2 strokes I know of as of late is the Aprillia system which works pretty well. I'm a big fan of 2 strokes just not where we are in the world today, but all good points you made, duely noted.<br /><br />StitchB