Derpy Drifter Posted December 31, 2017 Report Posted December 31, 2017 Hey all! As the new year comes around, riding season for me is coming up too. I’ve just gotten my 521 motor done, except I need bigger carbs. Right now I have Mikuni VM30 carbs. I was looking at Mikuni VM38 snowmobile carbs. Does anyone have experience with these? I’m open to ideas here. I’m also not opposed to a big single carb since tuning would be much easier. Also I want to know about the cable setup, as I had to modify my stock cable just a little bit for the VM30s, but they work great. Anyway thanks for the input! Sent from my iPad using Tapatalk Quote
bluebanshee98 Posted December 31, 2017 Report Posted December 31, 2017 39 or 41 pwk’s . Did you build this motor by any chance? I see that you wrote your not opposed to a big single carb . Did I read that right?Sent from my iPhone using Tapatalk Quote
Derpy Drifter Posted December 31, 2017 Author Report Posted December 31, 2017 Yes I built the motor, and you read that right about the single carb. I don’t think I’ve ever seen one on a big motor Banshee though. Also guys, about what jet sizes would I need on the pwks? Sent from my iPhone using Tapatalk Quote
PaymentPlan Posted December 31, 2017 Report Posted December 31, 2017 Yes I built the motor, and you read that right about the single carb. I don’t think I’ve ever seen one on a big motor Banshee though. Also guys, about what jet sizes would I need on the pwks? Sent from my iPhone using Tapatalk Start rich, work your way down. When your coming down in size, do plug chops. End goal is to have the cardboard color on your burn ring.Sent from my SM-G900V using Tapatalk Quote
Derpy Drifter Posted December 31, 2017 Author Report Posted December 31, 2017 Start rich, work your way down. When your coming down in size, do plug chops. End goal is to have the cardboard color on your burn ring.Sent from my SM-G900V using TapatalkOf course of course. However I have no idea where to even start because I know nothing about Keihin carbs as I’ve been using Mikunis.Sent from my iPhone using Tapatalk Quote
locogato11283 Posted December 31, 2017 Report Posted December 31, 2017 Gas motor?170 main. 48 pilot. CEL needle. Clip in the middle. Quote
Derpy Drifter Posted December 31, 2017 Author Report Posted December 31, 2017 521cc cub motor, 23cc super cub domes, 50/50 93 octane-110 octane Turbo Blue mixed at 32:1 Maxima Formula K2, +4 timing, and unfortunately still the FMF golds that came on the bike when I got it. Probably wouldn’t hurt to get a couple sizes up and down from those too right? Sent from my iPad using Tapatalk Quote
locogato11283 Posted December 31, 2017 Report Posted December 31, 2017 I would start with what I posted. The pilot should be right on, but with those pipes I bet the main will drop to a 162-165. Quote
Derpy Drifter Posted January 1, 2018 Author Report Posted January 1, 2018 I would start with what I posted. The pilot should be right on, but with those pipes I bet the main will drop to a 162-165.Alright, and that’s on which size pwk? You said 39 or 41. I ride woods with some hillclimbs and drags occasionally. (Yes I know it’s a lot of motor for woods lol) I’m not looking for the bleeding edge of power either since the motor is so big anyway, plus it’s a lot of money to risk leaning out and blowing upSent from my iPhone using Tapatalk Quote
Derpy Drifter Posted January 1, 2018 Author Report Posted January 1, 2018 Either one. Same jetting. Alright, sounds good Sent from my iPhone using Tapatalk Quote
Derpy Drifter Posted January 1, 2018 Author Report Posted January 1, 2018 Not to be that guy, but golly they are expensive aren’t they? $600 some dollars not including the manifold boots? Phew lolSent from my iPad using Tapatalk Quote
locogato11283 Posted January 1, 2018 Report Posted January 1, 2018 JFC. Sell everything and get into basketball or something. Quote
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