SS14PSI Posted April 3, 2011 Report Share Posted April 3, 2011 I have a 97 Banshee with a mostly stock motor. Motor Mods are; -Wiseco Pistons on stock bore (honed only) -Mid-top end dune port/polish -Milled Head -FMF Fattys -Trinity 2-1 intake/single carb (not sure of size) /K&N Filter Most of my riding is done at Sand Mountain, NV (5x per year max) with a little in the dirt as well. It runs great on regular 91 octane. Everyone tells me that the single carb is probably costing me lots of power. Should I leave it alone or switch up the setup? I'm guessing I'd need a new throttle cable for the dual setup too right? Also, I'm not totally opposed to an alky setup if the power gain is worth it, but I don't want a tempermental bike that I have to worry about blowing up and constantly tuning/checking plugs on either. Here's the bike Quote Link to comment Share on other sites More sharing options...
gotta_goatsfast Posted April 3, 2011 Report Share Posted April 3, 2011 I noticed a great top end hit when I switched from a single carb to dual carbs on my bike when it still had a stock port. I would look for some 33mm PWKs. Check your carb now, it might be a 33pwk in which case you could just pick up one more and purchase the throttle cable and filters. It might be wise to look at stepping up to more pipe. The fatties are a mid range pipe that probably sign off too early to benefit from the dune port you have. CPIs? I recently had the pleasure of trying the R2s from Borrink Performance and can honestly say they are an easy pipe to ride with a predictable powerband that still pulls to the very top. Quote Link to comment Share on other sites More sharing options...
06specialedition Posted April 3, 2011 Report Share Posted April 3, 2011 I noticed a great top end hit when I switched from a single carb to dual carbs on my bike when it still had a stock port. I would look for some 33mm PWKs. Check your carb now, it might be a 33pwk in which case you could just pick up one more and purchase the throttle cable and filters. It might be wise to look at stepping up to more pipe. The fatties are a mid range pipe that probably sign off too early to benefit from the dune port you have. CPIs? I recently had the pleasure of trying the R2s from Borrink Performance and can honestly say they are an easy pipe to ride with a predictable powerband that still pulls to the very top. X2, well said. See what carb you have now and you could possibly get a second one and new intakes. 33PWK's....... 32 or 34 Mikuni Flatslides are all nice. I still run my stockers and my bike runs awesome I have had great luck running CPI's on my duner. I don't have any experience with fmf's. Quote Link to comment Share on other sites More sharing options...
SS14PSI Posted April 4, 2011 Author Report Share Posted April 4, 2011 Awesome thanks for the replies. I'll start shopping and see what I can find. Hopefully I'll find a good used dual setup here or eBay, then recoup some cash by selling the single. I'll look and see what size my single is. Quote Link to comment Share on other sites More sharing options...
SS14PSI Posted April 5, 2011 Author Report Share Posted April 5, 2011 Well I looked at my single. It's a Keihen PWK but it doesn't say the size on it that I can see. I'll have to take it off and measure it I guess. Quote Link to comment Share on other sites More sharing options...
dcalsv02 Posted April 5, 2011 Report Share Posted April 5, 2011 Maybe you want to give cascade innovations a call and ask them about your single setup. They have custom made a new intake mani for the single carb setup that they are swearing by. Most of their bikes are using the new setup. They are saying that they can get the most performance out of their new single carb setup. www.cascadeinnovations.net . Im actually putting their setup on my bike this week. It looks really clean also. Just a thought. Nothing wrong with twin carbs, just putting that out their. Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted April 6, 2011 Report Share Posted April 6, 2011 Cascades single carb intake is pretty much the same thing as the trinity single carb intake. Nothing new there, it has been the same for about 6 years now. Quote Link to comment Share on other sites More sharing options...
theeechozen1 Posted April 7, 2011 Report Share Posted April 7, 2011 I run the 33's PWK and like them.. they tune really easy and stay there. Ive got the brass screws and easy springs from FAST. Have you thought about having your timing plate notched for some advance? That with the Duals would give it a new personality, that made a huge difference on my bike after I had ported and then switched to the duals (ran a 2-1 way back) ... Results may vary depending on how good the pump fuel is in your area! Having a small airport around with self serv pumps helps... Quote Link to comment Share on other sites More sharing options...
SS14PSI Posted April 7, 2011 Author Report Share Posted April 7, 2011 Thanks for the good info guys keep it coming. I just bought a set of 34mm flatslide Mikunis and a stage 4 Trinity head with 19cc domes from a member here in the classifieds. I called Trinity first and they said that the 19cc domes should be perfect for my setup on pump gas at Sand Mtn, NV. He said I'll likely need 100 octane for home though (sea level). I'm hoping those Mikunis won't be too much for my setup. I'm definitely going to look into notching my timing plate, I know there's a sticky on it here. Any guesses on what pilot/mains would put me in the neighborhood? This will be for Sand Mtn (4000ft). Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted April 7, 2011 Report Share Posted April 7, 2011 Thanks for the good info guys keep it coming. I just bought a set of 34mm flatslide Mikunis and a stage 4 Trinity head with 19cc domes from a member here in the classifieds. I called Trinity first and they said that the 19cc domes should be perfect for my setup on pump gas at Sand Mtn, NV. He said I'll likely need 100 octane for home though (sea level). I'm hoping those Mikunis won't be too much for my setup. I'm definitely going to look into notching my timing plate, I know there's a sticky on it here. Any guesses on what pilot/mains would put me in the neighborhood? This will be for Sand Mtn (4000ft). You need to do a compression test, cause a ported motor will have different compression than a stock port motor because of the exhaust port height. One of the sponsors on here has jet specs for 34mm TM's, can't remeber who it is. Quote Link to comment Share on other sites More sharing options...
SS14PSI Posted April 7, 2011 Author Report Share Posted April 7, 2011 You need to do a compression test, cause a ported motor will have different compression than a stock port motor because of the exhaust port height. One of the sponsors on here has jet specs for 34mm TM's, can't remeber who it is. What is a compression test going to tell me? Am I doing that for something related to the jetting or the head domes? Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted April 7, 2011 Report Share Posted April 7, 2011 What is a compression test going to tell me? Am I doing that for something related to the jetting or the head domes? You said you were worried about running race gas, you may be able to run 50/50 depending on your porting. Quote Link to comment Share on other sites More sharing options...
SS14PSI Posted April 8, 2011 Author Report Share Posted April 8, 2011 Ohh ok. Is there a chart that'll tell me what octane I'll need based on psi of compression? Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted April 8, 2011 Report Share Posted April 8, 2011 Ohh ok. Is there a chart that'll tell me what octane I'll need based on psi of compression? No, but 160-180 psi 50/50 race fuel 181+ full race fuel. This is also gonna depend on what timing you run. Approximate Cranking Compression These pressures are estimates based on fresh stock bore, piston, porting, and deck height. It is recommended to check your compression after installation. Sea Level 1000' 2000' 3000' 4000' 5000' 18cc 197 178 171 170 165 145 19cc 183 167 160 158 152 137 20cc 169 156 149 146 140 129 21cc 156 145 138 134 128 121 stock 130 125 118 112 106 100 Quote Link to comment Share on other sites More sharing options...
dcalsv02 Posted April 15, 2011 Report Share Posted April 15, 2011 Cascades single carb intake is pretty much the same thing as the trinity single carb intake. Nothing new there, it has been the same for about 6 years now. you are right, not much has changed in the 2-1 trinity setup. save for cascades manifold. I brought my trinity manifold in to compare. They are different. I would think that their new manifold would boast much better performance. Quote Link to comment Share on other sites More sharing options...
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