Lowroll Posted August 12, 2015 Report Posted August 12, 2015 So tonight I finished putting my 98 shee back together after a 4 mil build and it wont run. ignition is all stock except for being +5 timing. if I choke the carbs, it tried to start one time. Take them off choke and it tries to start, one time. So I checked spark and its there on both cylinders, plugs are new and gapped .028. I swapped my stock coil for my dyna coil and it immediately fired up but sounds as if its alternating cylinders and it idles rough and then backfires, went back to stock coil and it wont run again, but still has spark. looking for suggestions. pick up gap is set at .018 so that shouldn't be an issue, ran great before it was taken apart. I have deleted the parking brake since it last ran. No idea if that would hurt it or not. mods are HJR 4 mil mx hardcore port cool head with custom domes chariot reed cages chariot intakes Keihin 35mm Pwk's CEL needles, 152 mains, 50 pilots, 1.5 out on air screw FMF SSt pipes and power core 2 silencers +5 timing first gallon of fuel is 93 octane mixed 20:1 with yamalube 2r I'm hoping it's something simple that I'm overlooking Quote
Lowroll Posted August 12, 2015 Author Report Posted August 12, 2015 Also, showing 130 psi per cylinder on fresh bore and rings so compression is good, didn't hold pressure on leak down but it did pass the less than 1 psi per minute test. I sprayed the whole engine down case halves and all and couldn't find it. I think it might have been my tester itself leaking. Quote
hercalmighty Posted August 12, 2015 Report Posted August 12, 2015 Did you disconnect the tors brain? Try closing up the gap on your plugs. Are all of your grounds connected and clean? Sent from my VS980 4G using Tapatalk Quote
bmccormick08 Posted August 12, 2015 Report Posted August 12, 2015 All grounds are good to go and tors was deleted in the past and bile ran fine without it Sent from my SM-N910V using Tapatalk Quote
trickedcarbine Posted August 12, 2015 Report Posted August 12, 2015 Also, showing 130 psi per cylinder on fresh bore and rings so compression is good, didn't hold pressure on leak down but it did pass the less than 1 psi per minute test. I sprayed the whole engine down case halves and all and couldn't find it. I think it might have been my tester itself leaking.Didn't pass a proper test, so you made up a hillbilly test that justified the fact that it failed. Always verify EVERYTHING, why risk the thousands on the motor. Quote
bmccormick08 Posted August 12, 2015 Report Posted August 12, 2015 I have read on here dozens of times that less than 1psi per minute is acceptable Sent from my SM-N910V using Tapatalk Quote
sleeper06 Posted August 12, 2015 Report Posted August 12, 2015 IMO leaks don't go away they get worse, I wont let anything leave my shop unless it holds 100%,usually backfiring is electrical or airleak , gap plugs at .020, ohm out coil , check pickup gap also .020 on both nubs, all u need is spark compression and fuel 1 Quote
bmccormick08 Posted August 12, 2015 Report Posted August 12, 2015 Been talking with Kan on the fb group. I've reset pick up gap, cleaned grounds, regapped plugs at .024, cleaned pickups and found the green coil wire was rubbing the flywheel, so I fixed that and I'm trying again Sent from my SM-N910V using Tapatalk Quote
bmccormick08 Posted August 12, 2015 Report Posted August 12, 2015 So kan is no good? He's the only one that's replied Sent from my SM-N910V using Tapatalk Quote
trickedcarbine Posted August 12, 2015 Report Posted August 12, 2015 Kan will take care of you well. Quote
Lowroll Posted August 12, 2015 Author Report Posted August 12, 2015 So, here's where its at now. It fires right up on the dyna coil but runs awful. its loping from cylinder to cylinder. it smokes out the left for a second, then stops and smokes out the left and back and forth. backfires when revved. Sent Kan a video of it and he thinks its the stator failing. Pulled the flywheel and found the green source wire on the stator with a rub mark where it had come out and touched the flywheel. I believe she grounded out as I now show resistance from source to ground which he said should be open line. Local yamaha dealer has a stator on the shelf that im going to get in the morning and try out Quote
bmccormick08 Posted August 12, 2015 Report Posted August 12, 2015 Cdi is stock, stock coil is still on the bike. No fire with the stock coil at all. Has spark but won't start the bike. Dyna coil swapped in for stock and it fires right up but runs terrible Sent from my SM-N910V using Tapatalk Quote
Deadbeat Posted August 12, 2015 Report Posted August 12, 2015 so your running +5 timing and a dyna...sure its not running backwards? Quote
bmccormick08 Posted August 12, 2015 Report Posted August 12, 2015 No no no. Dyna COIL not a full dynatek ignition Sent from my SM-N910V using Tapatalk Quote
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