89mustang Posted February 22, 2014 Report Share Posted February 22, 2014 I just posted a few days ago I rebuilt my first top end. I took my time a d made sure everything was assembled correctly. I had the cylinders bored by fast and ported I also added a cool head. I finally had the time yesterday to finish putting it together. I put gas and coolant in it and kicked and kicked and kicked some more. It finally fired but then one cylinder dropped off. Then it was hard to start again. I pulled the plug and it has spark and the carb is getting gas. I took the carb off and cleaned everything because it was sitting for about 2 months since I took it apart. It took quite a few kicks until it fired up, both cylinders were firing the the same cylinder dropped off again. I pulled the plugs both were wet. I kicked it over a few times and it fired up fine both were firing then the same cylinder quit firing again. Any ideas? Mods: v-force v4 reeds, adjustable timing plate set at +4, ported cylinders, cool head with 20cc domes, pro design air filter no lid, and t-5's Jetting: 650' elevation 27.5 pilots, needle on third clip, 300 mains Quote Link to comment Share on other sites More sharing options...
uman1030 Posted February 22, 2014 Report Share Posted February 22, 2014 you said carb as in singular? leakdown test! compression test! Quote Link to comment Share on other sites More sharing options...
89mustang Posted February 22, 2014 Author Report Share Posted February 22, 2014 Sorry. I'll still have the 2 factory carbs Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted February 22, 2014 Report Share Posted February 22, 2014 (edited) check and double check all connections, grounds, switches,dielectric grease ain't a bad idea.. Ohm coil and caps. Try new plugs, even if they are new. Using proper puller, remove flywheel and clean poles on stator, clean inside of flywheel, clean timing nubs on outside of f-wheel, set pick-up gap. Because the Banshee uses a wasted spark it's hard to tell if each plug is fireing on compression, as they also fire at BDC. Is TORS brain and parking brake disabled? Edited February 22, 2014 by Larry's Shee Quote Link to comment Share on other sites More sharing options...
foxrider603 Posted February 22, 2014 Report Share Posted February 22, 2014 Are the carbs completely synched ? Cross over tube connected securely? Quote Link to comment Share on other sites More sharing options...
89mustang Posted February 23, 2014 Author Report Share Posted February 23, 2014 I've been messing with it since I got home. Swapped plug wires it didn't move. Tried a new plug didn't make any difference. The tors is still connected. Choke tube is intact and connected. I'll get the stuff tomorrow for a leak down test. It's incredibly hard to start. I'm done for the night ill check the carb synch as well. I've never used an ohm meter. I know what they are for though. The wife has to work a double tomorrow so ill have time Quote Link to comment Share on other sites More sharing options...
uman1030 Posted February 23, 2014 Report Share Posted February 23, 2014 I've been messing with it since I got home. Swapped plug wires it didn't move. Tried a new plug didn't make any difference. The tors is still connected. Choke tube is intact and connected. I'll get the stuff tomorrow for a leak down test. It's incredibly hard to start. I'm done for the night ill check the carb synch as well. I've never used an ohm meter. I know what they are for though. The wife has to work a double tomorrow so ill have time unplug the tors brain, unplug the parking brake switch. Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted February 23, 2014 Report Share Posted February 23, 2014 are reeds new? Quote Link to comment Share on other sites More sharing options...
89mustang Posted February 23, 2014 Author Report Share Posted February 23, 2014 Yes the reeds have 2 hrs. On them. They still look brand new. It's just frustrating because it was running pretty good until I rebuilt the top end. Quote Link to comment Share on other sites More sharing options...
uman1030 Posted February 23, 2014 Report Share Posted February 23, 2014 are you sure the slides are not reversed? this was an issue in another thread. slides should have a higher cutaway on the air-filter side then the engine side. when installed reverse it will be hard to start and wont idle or run well. it will be super rich to the point of flooding and fouling plugs. Quote Link to comment Share on other sites More sharing options...
89mustang Posted February 23, 2014 Author Report Share Posted February 23, 2014 Uman I'm going to check right now. I disconnected the tors and parking brake. I started easier and hit on both cylinders. But would only idle with me holding the throttle slightly. If I gave it any gas the rpm seemed like it would not increase and it died out Quote Link to comment Share on other sites More sharing options...
89mustang Posted February 23, 2014 Author Report Share Posted February 23, 2014 Slide was on correctly Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted February 24, 2014 Report Share Posted February 24, 2014 Have you tried cleaning the carbs? Set the floats. Was it warmer when it last ran? If so might have to adjust the carbs some. Carbs synced? You changed nothing else that would affect the "tune"? Quote Link to comment Share on other sites More sharing options...
89mustang Posted February 24, 2014 Author Report Share Posted February 24, 2014 I haven't fully cleaned the carbs. I made sure the pilot was clean and the main jet. It was warmer it was October. The only thing that changed was the porting,new pistons,and cool head. I know it was going to have to be adjusted I just wanted to make sure everything was good before I changed the jetting. I appreciate all the help so far Quote Link to comment Share on other sites More sharing options...
VoOK Posted February 24, 2014 Report Share Posted February 24, 2014 (edited) Have you rejetted for the new mods done? Try a 30 pilot Edited February 24, 2014 by VoOK Quote Link to comment Share on other sites More sharing options...
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