Flyin_Shee Posted December 3, 2004 Report Posted December 3, 2004 I just got my Keihin 30mm Flatside Carbs tonight and I'm wondering how well they will work with my Banshee. I just have FMF Fatty pipes and FMF Powercore II silencers and I will be running no lid for radar runs. Quote
banshee04le Posted December 3, 2004 Report Posted December 3, 2004 Jetted right, they make a very noticeable improvement in throttle response and topend and should work great with your setup. Quote
Banchetta Posted December 4, 2004 Report Posted December 4, 2004 I just got my Keihin 30mm Flatside Carbs tonight and I'm wondering how well they will work with my Banshee. I just have FMF Fatty pipes and FMF Powercore II silencers and I will be running no lid for radar runs. 288287[/snapback] You'll lose hp w/ larger carbs unless you get some porting and intake mods done... Quote
Flyin_Shee Posted December 4, 2004 Author Report Posted December 4, 2004 I just got my Keihin 30mm Flatside Carbs tonight and I'm wondering how well they will work with my Banshee. I just have FMF Fatty pipes and FMF Powercore II silencers and I will be running no lid for radar runs. 288287[/snapback] You'll lose hp w/ larger carbs unless you get some porting and intake mods done... 288636[/snapback] How would you lose HP when adding a bigger carb? Everyone knows the stock carbs on Banshee are way too small as it is and I wouldn't be losing HP, just bottom end until the powerband kicks in and the extra fuel is really needed. Quote
banshee04le Posted December 4, 2004 Report Posted December 4, 2004 Banchetta knows his shit dude. Come to think of it, I bolted on my 30's with the stock porting and I thought the bike ran better with the stock carbs even after lots of jetting effort. I had my cylinders ported shortly after that and I loved those carbs on that setup. Ran them for a while...I forgot my initial problems when I first started with them though...not major problems, it just didn't feel like an improvement. Quote
RNBRAD Posted December 4, 2004 Report Posted December 4, 2004 It's called intake velocity. You want to retain as much of it as you can without restricting your intake. It's a balance as is everything you do to a banshee. Quote
Banchetta Posted December 4, 2004 Report Posted December 4, 2004 (edited) Like Rnbrad said. You need velocity to run a carb. You have to have a certain amount of air speed to go through your carb in order to pull fuel from the carb bowl. The larger the carb, the less velocity you have which = less efficiency. If you port your cylinders or stroke it, then you'll move more air which will allow you to go to a larger carb and still maintain good velocity. Here is a dyno w/ ported stock carbs and stock carbs. I also did a dyno w/ 34mm carbs and lost 8hp throughout the whole curve w/ over 16 hours of jetting. Before jetting, I lost 12hp. Edited December 4, 2004 by Banchetta Quote
rebelbanshee2 Posted December 4, 2004 Report Posted December 4, 2004 Everyone knows the stock carbs on Banshee are way too small as it is 288678[/snapback] no, everyone THINKS that... Quote
broke Posted December 4, 2004 Report Posted December 4, 2004 Everyone knows the stock carbs on Banshee are way too small as it is 288678[/snapback] no, everyone THINKS that... 288784[/snapback] I agree, the stock carbs actually work very well up until the mods start getting a little more serious. The carbs will work fine and you will be one step ahead when you decide to step up to something a little faster. You may lose a marginal amout of throttle response with the 30's but it won't be as noticable as it was when Banchetta tried the 34's. The difference between stock and 30 is not as big of a jump as 30 to 34. Quote
Flyin_Shee Posted December 8, 2004 Author Report Posted December 8, 2004 Well my cylinders are being ported this Thursday, so hopefully that'll help some. V-Force reeds might be on the way also, depending on funding and how much time I have left. I noticed that one of my cylinders is a little bit more scratched up than the other, if I hone it will it make a difference in size (as in having to overbore)? It just needs a small honing job, not even close to overbore. Just wondering... Quote
Banchetta Posted December 10, 2004 Report Posted December 10, 2004 ONly way to tell is to measure and mic the cylinders. Make sure the bore isn't egg -shaped neither. Honing is also only used to scratch up the cylinders a little for help in seating the rings, not to clean out scratches. Quote
Flyin_Shee Posted December 10, 2004 Author Report Posted December 10, 2004 ONly way to tell is to measure and mic the cylinders. Make sure the bore isn't egg -shaped neither. Honing is also only used to scratch up the cylinders a little for help in seating the rings, not to clean out scratches. 291313[/snapback] Yea, I decided not to do anything about it...it's not that bad at all. Also, is there a good way to get carbon deposits off of th e top of the piston? And what does that signify if carbon is depositing...leaving the top of the piston sorta yellowish-brown? Too rich? Quote
Banchetta Posted December 11, 2004 Report Posted December 11, 2004 Means your running pump gas.... Quote
Flyin_Shee Posted December 12, 2004 Author Report Posted December 12, 2004 Means your running pump gas.... 291947[/snapback] With gas prices now, I'm not paying for anything above 93 octane! I felt like I was getting the deal of a lifetime when I saw 87 octane for $1.65!! I had to drive to the Twin Cities to get that though . Does anyone know of a good way to get carbon deposits off the top of the pistons? Quote
Big Blue Posted December 12, 2004 Report Posted December 12, 2004 Acuall around here the prices of race fuel havent gone up, just regular gas and diesel is higher than premium now. Quote
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