Pinkylee Posted August 25, 2020 Report Share Posted August 25, 2020 I'm looking for advice on jetting a new build. Would rather be a little fat, then lean..especially for break in.. Mods are stock stroke, 64.5 pistons, dune/play ported cylinders, cool head with 18cc domes, Mikuni 28's round slide carbs, T5 pipes, +4 timing, k&n filter, air box w/o lid..93 octane, 600ft to 1500ft elevation.......Thanks in advance Sent from my LM-Q720 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Eric_C1 Posted August 26, 2020 Report Share Posted August 26, 2020 You will more than likely grenade that motor running 93 octane with 18cc domes.. usually anything 20cc or under requires at least 50/50 race gas / 93 depending on elevation. Do a compression test before you even mess with jetting, if its over 150 psi you're gonna be mixing 110 and 93 into it, and if you're over 165 its straight 110 time. Quote Link to comment Share on other sites More sharing options...
Pinkylee Posted August 27, 2020 Author Report Share Posted August 27, 2020 We'll I had port work done by f.a.s.t . and that's the dome size Jeff recommend. He said I should wind up around 160 psi and be fine with 93 octane.. This is my first Banshee, so I'm just going by His advice. Quote Link to comment Share on other sites More sharing options...
Eric_C1 Posted August 27, 2020 Report Share Posted August 27, 2020 Well if that's what he said he definitely knows his shit better than me, I was just going off the info I could find when I was building my bike. I'd still compression test it just to make sure that's what it's at but up to you. Good luck 👍 1 Quote Link to comment Share on other sites More sharing options...
kawa110 Posted August 27, 2020 Report Share Posted August 27, 2020 Call fast, order jets from them. What elevation in California? You’ll need to test compression in both locations. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Pinkylee Posted August 27, 2020 Author Report Share Posted August 27, 2020 Yeah.. That's what I wound up doing.. Cody got back with me and said to maybe start out with 360's and 27.5 pilots.... The biggest mains I have on hand are 340's and I only have 25's and 30's for pilots... So I'm considering putting in the 340's and 30's just for initial heat cycle...Should be ok just for that, wouldn't ya think ? And I'm actually in Ohio.Sent from my LM-Q720 using Tapatalk Quote Link to comment Share on other sites More sharing options...
fixitrod Posted October 11, 2020 Report Share Posted October 11, 2020 On 8/26/2020 at 1:24 PM, Eric_C1 said: You will more than likely grenade that motor running 93 octane with 18cc domes.. usually anything 20cc or under requires at least 50/50 race gas / 93 depending on elevation. Do a compression test before you even mess with jetting, if its over 150 psi you're gonna be mixing 110 and 93 into it, and if you're over 165 its straight 110 time. It could be the port work... port timing... that allows this. I ran into something similar that required smaller domes than expected. FAST should also be able to start you off with a jetting recommendation to "tune from". Quote Link to comment Share on other sites More sharing options...
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