fummins350 Posted February 11, 2014 Report Share Posted February 11, 2014 So my buddy had his motor rebuilt on his banshee and now it wont run right. The reason for havin it rebuilt was had an aftermarket cdi box on it which went bad and made his motor run Backwards and it blew up. So this is the list of stuff he has done to it.... 4 mill stroker with the long rods, bored .40 over, vforce 4 reeds, cool head with 22cc domes, k&n airfilter, boost bottle, dmc pipes, it was a brand new fly wheel and stator but there not anything crazy aftermarket like, they are the stock carbs with the TORS removed. Right now we havent touched the carbs it will start up but when you give it gas it bogs down and shuts off. And it kinda sounds like its not firing right either. I dont know what it could be if the carbs need adjusted and need to know what jets to run in them and if the timing could be off or what to do with it... If someone could please help me that would be great. Thank you!!! Quote Link to comment Share on other sites More sharing options...
oldskool Posted February 11, 2014 Report Share Posted February 11, 2014 Are you saying the new flywheel and stator are aftermarket or not? Did you connect the choke tube that goes between the carbs? Are the reeds in good shape and most importantly, was a leakdown test performed on this engine after rebuild Quote Link to comment Share on other sites More sharing options...
Deadbeat Posted February 11, 2014 Report Share Posted February 11, 2014 4mm stroker, was this motor ported to suit?, all you've listed is bolt on mods and a rebore Quote Link to comment Share on other sites More sharing options...
uman1030 Posted February 11, 2014 Report Share Posted February 11, 2014 There should be a auto message for all new members, hi welcome to bhq, before proceeding; have you done a compression test, leakdown test, tors and parking break properly eliminated, choke tube installed, carbs cleaned thoroughly, synced properly, made note of current jets installed. checked reeds, tested stator and coil, trimmed wires back/reinstalled caps, new plugs. Carry on then 1 Quote Link to comment Share on other sites More sharing options...
Young Guns Racing Posted February 11, 2014 Report Share Posted February 11, 2014 There should be a auto message for all new members, hi welcome to bhq, before proceeding; have you done a compression test, leakdown test, tors and parking break properly eliminated, choke tube installed, carbs cleaned thoroughly, synced properly, made note of current jets installed. checked reeds, tested stator and coil, trimmed wires back/reinstalled caps, new plugs. Carry on then X2 - should be a welcome pack lol Quote Link to comment Share on other sites More sharing options...
Atomic Monkey Posted February 11, 2014 Report Share Posted February 11, 2014 Stilll running the setup that made it run backwards? And really... a cdi did that? Adjustable timing plate or not? Still got the stock flywheel? Try that. If that doesn't work, try swapping the trigger wires at the plug... believe they are wht/grn and wht/red. If none of that works, put the aftermarket cdi back on, retime for reverse rotation, and get rear view mirrors Quote Link to comment Share on other sites More sharing options...
topfuel! Posted February 11, 2014 Report Share Posted February 11, 2014 Check the pickup coil gap on the stator, an improperly gapped pickup coil can cause all kinds of problems. set the gap with a business card. Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted February 11, 2014 Report Share Posted February 11, 2014 So my buddy had his motor rebuilt on his banshee and now it wont run right. The reason for havin it rebuilt was had an aftermarket cdi box on it which went bad and made his motor run Backwards and it blew up. So you're saying the engine was running and suddenly started running backwards (reverse)? Quote Link to comment Share on other sites More sharing options...
Deadbeat Posted February 12, 2014 Report Share Posted February 12, 2014 must of bolted the carbs to the pipes and reversed the reeds or something Quote Link to comment Share on other sites More sharing options...
red94yj Posted February 12, 2014 Report Share Posted February 12, 2014 No lie. During the rebuild of my banshee. The motor was running in reverse, i assume. I actually rode it in reverse. NO LIE. I could change gears and everything. Wish I had a video. Quote Link to comment Share on other sites More sharing options...
uman1030 Posted February 12, 2014 Report Share Posted February 12, 2014 Apparently this can happen. There is a video on YouTube of this happening to a banshee and he does ride it backwards. Quote Link to comment Share on other sites More sharing options...
Atomic Monkey Posted February 12, 2014 Report Share Posted February 12, 2014 I had a flywheel key get pushed out and I didn't notice. The flywheel musta turned just enough that it wanted to fire, and kicked back hard enough I thought my foot was broken the next day, but it looked like it was trying to spin backwards. Older outboard boat engines, especially Evinrudes, had a safety on the crank that would kill the ignition if they popped themselves backwards at an idle. Quote Link to comment Share on other sites More sharing options...
03DMshee Posted February 12, 2014 Report Share Posted February 12, 2014 If the bikes timing is out of whack it indeed can run backwards.... Quote Link to comment Share on other sites More sharing options...
red94yj Posted February 12, 2014 Report Share Posted February 12, 2014 (edited) My problem ended up being a bad flywheel key, which ended up throwing my timing way out of wack. Check your flywheel key. Edited February 12, 2014 by red94yj Quote Link to comment Share on other sites More sharing options...
Stonytony Posted February 13, 2014 Report Share Posted February 13, 2014 My advise is sense it starts but dies out when you give it throttle it's from the reeds to the air filters and anything in between. 30 pilots 440 mains to start with needle clip in the middle air screw 2 turns out. IMO those carbs are too small. Soak the carbs in some gas to clean them for a day/overnight Check the timing plate and pickup for damage and for out of tolerance for the pickup. Also check the timing key don't go past +4 unless you know what your doin. If it was a leak down issue it should rev up and take a long time to drop down to idle Compression should be 130-140 could be more due to porting and domes. Less just makes a hard start once it's warmed up. A bad stator will only show its issue under load. Revving it is not under load. Check it with an ohm meter. Your clymer book has the specs. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
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