606wes606 Posted January 8, 2011 Report Posted January 8, 2011 Needing help building my 4mill. I've browsed this site before and it has alot of useful info, so i decided to join. I have a mostly stock 01 shee with t5 pipes, adjustable timing plate, stock carbs with tors removed and jetted, open airbox with uni filter. now recently got a 4mill drag banshee with engine needing top end reassembled. It has stock cylinders with wsm big bore sleeves, ported but not sure what kind of port job (the guy just bought them from ebay), 69mm wsm pistons, 37mm keinhin carbs (thats what i was told). Pro design intakes for the carbs, vforce reeds, adjustable timing plate, wicked drag pipes. my main concerns are the carbs, will they be too big for pump gas after rejeted? its jetted for alky right now. carbs also have dial-a-jets on them but not too familiar with those. also looking for a coolhead with big bore domes cut for a 4mill.. Wanting to use 91octane, im putting it on my 01 shee because the crank went down and i want a strong 4mill. also, would the t5's be too small for this motor? i dont want to use the drag pipes. Thanks for any help Quote
jbooker82 Posted January 8, 2011 Report Posted January 8, 2011 If your carbs are setup for methanol then they won't work for gasoline. When you properly set them up for alachol you drill the dump tubes out to 0.118 or in that area. The dump tube is the passage of the carb body that the needle slides up and down in. It is nonreplaceable. Quote
606wes606 Posted January 8, 2011 Author Report Posted January 8, 2011 If your carbs are setup for methanol then they won't work for gasoline. When you properly set them up for alachol you drill the dump tubes out to 0.118 or in that area. The dump tube is the passage of the carb body that the needle slides up and down in. It is nonreplaceable. i'll try check them tomorrow since im at work now. think it would be noticable from being drilled out? im guessing mine wasnt properly setup since they were still running a spacer plate for the 4mill. if they arent drilled would they be fine to run on it? and if not would the stock carbs be fine if jetted big enough? Quote
sleeper06 Posted January 8, 2011 Report Posted January 8, 2011 t-5s and stock carbs are not optimal but they will work,i just built a 4mill stock cyl drag port for a friend,he was outta money so we used his stock carbs and since i stole my pipes back sst are on now.it hauls ass but not optimal Quote
jbooker82 Posted January 8, 2011 Report Posted January 8, 2011 i'll try check them tomorrow since im at work now. think it would be noticable from being drilled out? im guessing mine wasnt properly setup since they were still running a spacer plate for the 4mill. if they arent drilled would they be fine to run on it? and if not would the stock carbs be fine if jetted big enough? You won't be able by eye. You just get a machine drill bit set. See wich bit fits. Quote
606wes606 Posted January 8, 2011 Author Report Posted January 8, 2011 t-5s and stock carbs are not optimal but they will work,i just built a 4mill stock cyl drag port for a friend,he was outta money so we used his stock carbs and since i stole my pipes back sst are on now.it hauls ass but not optimal so what would be some good inframe pipes to run on this 4mill? the drag pipes i have are out of frame pipes and i'll be doing mostly fast trails, and some hills on it. also, the 37mm carbs would be fine though if they arent drilled? Quote
jbooker82 Posted January 9, 2011 Report Posted January 9, 2011 I would run CPI's they come on a sooner than other inframes and are more forgiving. Sniper's pipes are supost to come on like cpi's and rev out 800 more rpms. But they are a inframe drag pipe that is speciffically designed for the 421 cub cylinder. Quote
bigblockbanshee Posted January 9, 2011 Report Posted January 9, 2011 t-5s and stock carbs are not optimal but they will work,i just built a 4mill stock cyl drag port for a friend,he was outta money so we used his stock carbs and since i stole my pipes back sst are on now.it hauls ass but not optimal So what exactly is optimal for stock carbs? Just curious as I'm in the same boat with the T5s and stockers. Quote
rdzbangshee Posted January 10, 2011 Report Posted January 10, 2011 sounds like a mean lean fire breathing melt down machine i melted down many engines from jetting being to lean Quote
606wes606 Posted January 12, 2011 Author Report Posted January 12, 2011 You won't be able by eye. You just get a machine drill bit set. See wich bit fits. hey, i've just now had the time to check the carbs..the bit i found that fits is a 7/64. not sure if you would know what size would be stock, but thanks for the help. Quote
606wes606 Posted January 12, 2011 Author Report Posted January 12, 2011 I would run CPI's they come on a sooner than other inframes and are more forgiving. Sniper's pipes are supost to come on like cpi's and rev out 800 more rpms. But they are a inframe drag pipe that is speciffically designed for the 421 cub cylinder. thanks, i was considering some cpi's..good to see info like this. maybe i can get rid of my out of frames and find a nice set Quote
606wes606 Posted January 12, 2011 Author Report Posted January 12, 2011 sounds like a mean lean fire breathing melt down machine i melted down many engines from jetting being to lean hopefully mine will be all of that except for the melting down..hah. what jetting would you recomend to start with for stockers if i have to run them? im trying to stay away from using my stockers and t-5's on this motor since im going to rebuild my other motor to stock stroke and use them. Quote
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