Biggt613

Air screw 2 turns out

Thanks again man

just had her out for a rip. Had the petcock seals leaking kept flooding out. Started with 170mains 58 pilot cgl 4th clip. Idle 7 turns out. Its was close but had a lag coming onto needle and fell off on the main. Now i am at 172 main 5th clip. 58 pilot idle 8 turns out. Its -25 out here and it flat out rips!! Syncd carbs. Idles dead even. I turned my neighbourhood into a flattrack lol. Its crisp need to plug chop the main yet but it feels good. Oh and i am sitting at 195 psi on bith cylinders and running straight c12 32/1 with dominator. I cant even explain how jacked i am to get this beast in the ice. Thanks alot man

Thanks alot. I am expecting to be in the 0-10f range most of the time but its about 32f now. Was pulling motor apart last night and organizing the big bore stuff. My 1 piece boss billet intake with the v4’s will push my carbs back 3/4” or so. I dont think my airbox will fit so i am ordering uni pods tomorrow. Would have had everything together but when shop took new piston out of box to match with jugs they for got to put rings back in. With the pods i will probably start at 175 mains and work down.

Cgl needles. What temperature was that jetting for approx?

My bad 1000-1500ft

Ok i have read alot of jetting threads and am familiar with dialing carbs in half decent. However i am about too put a new top end in with new carbs and it will be -20 when i start plug chops. So right now stock carbs,stock stroke, basically stock jugs, pc platnums, +4 timing, vf4’s, 50/50 c12/premium, no airbox lid, kn filter. -7Celcius 300main(-20 would be 320) 30pilot and its pretty crisp and tan. New set up will be sleeved 70mm cylinders. Stage 2 porting stock stroke, vf4’s, pc pipes, +4, kn filter. Stage 4 coolhead, 19cc domes, 34mm pj’s, 50/50 fuel 15/40 gearing. Lowered and widened for ice racing in canada. Now can someone give me a baseline/guideline to start with. Im a thinking 175/55 to start. Fwiw i also have leak down tester(thanks south texas) and carb sync on hand. I know its probably posted somewhere but not much out there for 70mm stock strokes. I got them cheap so sent them back to harry mcdermott to clean up and match pistons. thanks guys

Ok i have read alot of jetting threads and am familiar with dialing carbs in half decent. However i am about too put a new top end in with new carbs and it will be -20 when i start plug chops. So right now stock carbs,stock stroke, basically stock jugs, pc platnums, +4 timing, vf4’s, 50/50 c12/premium, no airbox lid, kn filter. -7Celcius 300main(-20 would be 320) 30pilot and its pretty crisp and tan. New set up will be sleeved 70mm cylinders. Stage 2 porting stock stroke, vf4’s, pc pipes, +4, kn filter. Stage 4 coolhead, 19cc domes, 34mm pj’s, 50/50 fuel 15/40 gearing. Lowered and widened for ice racing in canada. Now can someone give me a baseline/guideline to start with. Im a thinking 175/55 to start. Fwiw i also have leak down tester(thanks south texas) and carb sync on hand. I know its probably posted somewhere but not much out there for 70mm stock strokes. I got them cheap so sent them back to harry mcdermott to clean up and match pistons. thanks guys

I agree. Everything is fine now but when it comes time for a top end i figure ill try it out. If i can get some guidance. Dont wanna ruin anything either. Guy i got it from said bike it came off had stock crank and timing he just replace the top end cause a ring stuck in a piston groove. No scoring on cylinders. I would post pics but it doesnt seem to wanna let me

Hi guys noob here. Just picked up my first banshee a few weeks back. I vet race a rm250 and my son races 85’s soni am familiar with 2 strokes and love them but am not an engine builder. I can rebuild anything and have the tools to do so but this is new to me. I have been looking around for a week or so on info for a big bore 69.5mm. I picked up a set of 69.5mm jugs which have obviously been sleeved. Research tells me 68 is as bug as you can go with stock overbores. A trinity stage 4 head came with it with apparently 19cc domes which i believe means race gas. I keep c12 on hand fir the bikes anyway. Pistons also with it but used 69.42mmlook like wisecos but hard to tell. Supposedly had trinity porting but no markings on jugs identifying port job. It has been ported though and looks like a clean job. Would this be a 420cc kit? What else would i need to make this usable? 28mm carbs at least i would think. Adjustable stator to advance timing? It runs fine now but i like to plan ahead. Just want a reliable trail machine with the capability of some mx and ice racing up here in canada. Suspension and a arms etc i lnow what i need its the motor stuff i am trying to learn about. Seems to be stock stroke cylinders as well. I have read about short rod and long rods but Would prefer short so i dont have to change porting etc. Any help or links to read is really appreciated. Again just looking to the future. I like to plan and do things right even if it takes time.