beaterbanshee3825 Posted October 27, 2016 Report Share Posted October 27, 2016 Hey guys, it's my first post on the site. I recently built a new stock cylinder drag motor and I'm have it a little issue. One cylinder is cutting out under full throttle intermittently I have been playing with the carbs and timing and it's gotten better just not all the way fixed. Specs on the motor are... 10 mil crank 72mm bore stock cylinders 39pwks on alcohol .120 dumps .115 mains 55 pilot Tdr head 1-6 over ride Lockup clutch. Dyna cdi 8* timing plate Quote Link to comment Share on other sites More sharing options...
ginger Posted October 27, 2016 Report Share Posted October 27, 2016 i assume your running pods? i had a bad outerwear once, that if would run fine until it got to power, then it wouldnt let enough air flow through, and would shut a cylinder down. something stupid that took me a while to find. 1 Quote Link to comment Share on other sites More sharing options...
PaymentPlan Posted October 27, 2016 Report Share Posted October 27, 2016 (edited) Hey guys, it's my first post on the site. I recently built a new stock cylinder drag motor and I'm have it a little issue. One cylinder is cutting out under full throttle intermittently I have been playing with the carbs and timing and it's gotten better just not all the way fixed. Specs on the motor are... 10 mil crank 72mm bore stock cylinders 39pwks on alcohol .120 dumps .115 mains 55 pilot Tdr head 1-6 over ride Lockup clutch. Dyna cdi 8* timing plate 72mm stock cylinder uh Sent from my SM-G900V using Tapatalk Edited October 27, 2016 by controls77 Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted October 27, 2016 Report Share Posted October 27, 2016 That's an old school set up. Very cool if you can get it to run. Have you tried it with less then the 8* of timing posted above? Give the electronics a once over. Fresh boots. Clean all the connections and grease them with Dialectric. Clean stator pick ups on flywheel. Gap pick up. Etc. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted October 27, 2016 Report Share Posted October 27, 2016 72mm stock cylinder uh Sent from my SM-G900V using Tapatalk They exist. Pretty normal before the aftermarket cylinder craze. Quote Link to comment Share on other sites More sharing options...
beaterbanshee3825 Posted October 27, 2016 Author Report Share Posted October 27, 2016 Yea, running pods, but does it with no filters. And yea their 72mm welded transfers and what not. Runs hard just has that little burp up top Quote Link to comment Share on other sites More sharing options...
beaterbanshee3825 Posted October 27, 2016 Author Report Share Posted October 27, 2016 Tricked, I haven't really messed with the timing other than going from stock cdi to the dyna. Could it be the pickup coil by chance? Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted October 27, 2016 Report Share Posted October 27, 2016 Test the Pick Up per Clymer Manual Spec. When using a stock CDI set timing plate to zero and work up. If you have the Dyna on, make sure that if there is a plate on as well that it is zero if the CDI is adding timing. Or take notice of what is on the plate then program the Dyna accordingly. The Dynas can be finicky if you are not 100% sure what kind of timing it's throwing. Quote Link to comment Share on other sites More sharing options...
beaterbanshee3825 Posted October 27, 2016 Author Report Share Posted October 27, 2016 I will try that tonight, thanks for the help guys. Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted October 27, 2016 Report Share Posted October 27, 2016 Done a compression test? Wonder if head is leaking. If not its probobly electrical Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted October 27, 2016 Report Share Posted October 27, 2016 yea ive heard lots of mixed opinions on running a dyna + adding timing.... may be something to look into!I friggin love my Dyna! It's nice to make it freight train through tight stuff and out of the turn, but on the 1/2 mile course you can pull timing out and really let it rev. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted October 27, 2016 Report Share Posted October 27, 2016 Never ran my Dyna on a dyno yet. I just take it to the track and feed it timing till it starts to get Un happy, then I back it off a degree or so. Not sure I wanna test the new 10 mil like that though. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted October 27, 2016 Report Share Posted October 27, 2016 Done a compression test? Wonder if head is leaking. If not its probobly electricalThis^^^ check plugs for water droplets or steam coming out of the pipe after plug removal. Also, just to rule it out, try OEM CDI. Dynas are hit and miss. And you don't really know what timing is in it....and it adds more than OEM even on the "stock" setting. Quote Link to comment Share on other sites More sharing options...
PaymentPlan Posted October 27, 2016 Report Share Posted October 27, 2016 They exist. Pretty normal before the aftermarket cylinder craze.Ok, prob way before my time Sent from my SM-G900V using Tapatalk Quote Link to comment Share on other sites More sharing options...
PaymentPlan Posted October 27, 2016 Report Share Posted October 27, 2016 They exist. Pretty normal before the aftermarket cylinder craze.Not understanding... Is this using a stock cylinder casting that's bored for a Big bore 72mm sleve? Sent from my SM-G900V using Tapatalk Quote Link to comment Share on other sites More sharing options...
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