willaduncan Posted December 24, 2011 Report Posted December 24, 2011 I'm just trying to get an idea as as to what to look for, finished my rebuild today, during rebuild the motor was bored to .03 honed ported billet basket with hd springs billet water impeller +4 timing lightened flywheel uped the main jets to 330 new pushrod and ball fired up on like 4th kick ran great did 2 heat cycles then rode it in 1st - 3rd half to quarter throttle did the break in everything was fine, it started acting like it was choking I stopped and it died it would kick and turn over but not start... What should I look for when I get a chance to trouble shoot BTW carb was cleaned when rejetted and carnal were synced Quote
Finch Posted December 24, 2011 Report Posted December 24, 2011 I'm just trying to get an idea as as to what to look for, finished my rebuild today, during rebuild the motor was bored to .03 honed ported billet basket with hd springs billet water impeller +4 timing lightened flywheel uped the main jets to 330 new pushrod and ball fired up on like 4th kick ran great did 2 heat cycles then rode it in 1st - 3rd half to quarter throttle did the break in everything was fine, it started acting like it was choking I stopped and it died it would kick and turn over but not start... What should I look for when I get a chance to trouble shoot BTW carb was cleaned when rejetted and carnal were synced did ya have spark? outta gas or gas line clogged? did ya cheak the obvious choices first? Quote
thomas h. Posted December 24, 2011 Report Posted December 24, 2011 What brand pistons? Does .03 mean the pistons and bore clearance ? Thinking that piston clearance is too close. Or a fuel issue hope you do not have to tear it down Quote
willaduncan Posted December 24, 2011 Author Report Posted December 24, 2011 Wiseco pistons squish is at .050 it was bored 30 over . Yea checked fuel and flow didn't check spark I was on powerline breaking it in. Quote
Nieskes Posted December 24, 2011 Report Posted December 24, 2011 Plugs look good? Check for spark first. Quote
willaduncan Posted December 25, 2011 Author Report Posted December 25, 2011 Yea ill do all the obvious stuff first carb fuel plugs and spark I'm just wanting to know what all other than obvious to look for Quote
ticktock Posted December 25, 2011 Report Posted December 25, 2011 Yea ill do all the obvious stuff first carb fuel plugs and spark I'm just wanting to know what all other than obvious to look for Fuel, make sure fuel is flowing to the carbs, take the nut off the bottom of the bowl, Drain some fuel in a drip cup and make sure it flows in, both carbs. Check the plugs, Check the spark. (check the spark with plugs you know fire, not necessary the ones in the machine) If no spark, check connections, check stator, flywheel, make sure key is in Crank, could be sheared and your are 180 degrees out. Check coolant - O-ring blown? Check for leaks at the head Gasket/Base Gasket. Check compression. Really sounds like an an electrical problem or fuel problem. There is like 9 different possible electrical problems. Check to see if on the right side of the air box, your wires hit your pipes and melted them causing a short? Just thinking outside the box here. Adam Quote
willaduncan Posted December 25, 2011 Author Report Posted December 25, 2011 Fuel, make sure fuel is flowing to the carbs, take the nut off the bottom of the bowl, Drain some fuel in a drip cup and make sure it flows in, both carbs. Check the plugs, Check the spark. (check the spark with plugs you know fire, not necessary the ones in the machine) If no spark, check connections, check stator, flywheel, make sure key is in Crank, could be sheared and your are 180 degrees out. Check coolant - O-ring blown? Check for leaks at the head Gasket/Base Gasket. Check compression. Really sounds like an an electrical problem or fuel problem. There is like 9 different possible electrical problems. Check to see if on the right side of the air box, your wires hit your pipes and melted them causing a short? Just thinking outside the box here. Adam Yea thats what Im thinking a fuel or air issue, its just weird it was running so great and then after a 1/4 to 1/2 mile straight at 3/4 to full throttle bam the bitch cuts out seems like its just my luck lol i have more wrenching hours than ride time probably 10times more wrenching time.... Quote
scorpo04 Posted December 25, 2011 Report Posted December 25, 2011 This exact thing happened to me and i ended up shearing the key... apparently common i also did some.damage to my stator with the rotor spinnin and floppin untimed so be on the look out... Quote
Jereme6655 Posted December 25, 2011 Report Posted December 25, 2011 This exact thing happened to me and i ended up shearing the key... apparently common i also did some.damage to my stator with the rotor spinnin and floppin untimed so be on the look out... My suggestion could be that it is the flywheel nut wasn't installed quite tight enough and it vibrated loose enough to allow the flywheel to back off the press fit and it sheared the key causing the timing to be off.... Quote
Larry's Shee Posted December 25, 2011 Report Posted December 25, 2011 What changes to air flow did you do while you were rebuilding? No offense , but you sentence structure leads me to see you (had) ported it? Quote
willaduncan Posted December 28, 2011 Author Report Posted December 28, 2011 I didn't think of that I know I torqued it to 68ftlbs with blue lock tight... And yes it was ported by hjr that's the only air flow changes Quote
Jereme6655 Posted December 29, 2011 Report Posted December 29, 2011 I didn't think of that I know I torqued it to 68ftlbs with blue lock tight... And yes it was ported by hjr that's the only air flow changes well did you change the jetting in teh carbs to handle that extra air flow? or is it still the same as BEFORE you sent kevin your jugs? Quote
willaduncan Posted December 31, 2011 Author Report Posted December 31, 2011 Yes as stated in original post I put the mains up to 330 Quote
willaduncan Posted January 22, 2012 Author Report Posted January 22, 2012 I have had the bike back up for a while so I figured id update what was wrong lol, During re-assembly the wiring harness was ziptied too close to the exhaust and melted the wires to gether grounding EVERYTHING.... thanks for everyones help though Quote
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