87BRBanshee Posted September 1, 2012 Report Share Posted September 1, 2012 (edited) Ok so i raced my friend who has a bored out trx 250 to a 310 and i raced him and he beat me but not by much, Can a stock banshee beat a bored trx 250? my quad is stock except for 36mm mikunis. Im asking because After I finished replacing my crank seals i put the cylinders and head on and i noticed that the left side had no compression, so i took tht cylinder off to check the ring gap and when i went to put the ring in the cylinder it just fell right through. This is my first banshee and idk if it could beat a bored trx stock or not. So idk if i lost because of crappy compression on that side or what?? When i bought the bike 2 weeks ago the right pipe had more smoke coming out than the left one. Could that be a result of low compression on that side? Edited September 1, 2012 by 87BRBanshee Quote Link to comment Share on other sites More sharing options...
dunesovertrails Posted September 1, 2012 Report Share Posted September 1, 2012 (edited) Ok so i raced my friend who has a bored out trx 250 to a 310 and i raced him and he beat me but not by much, my quad is all stock except for 36mm mikunis. Well Im asking because After I finished replacing my crank seals i put the cylinders and head on and i noticed that the left side had no compression, so i took tht cylinder off to check the ring gap and when i went to put the ring in the cylinder it just fell right through. This is my first banshee and idk if it could beat a bored trx stock or not. but it seems to me like the rings should have been good for me to come close to beating him. When i bought the bike 2 weeks ago the right pipe had more smoke coming out than the left one. Could that be a result of low compression on that side? A banshee should beat a trx 450r let alone a trx 250. Edited September 1, 2012 by dunesovertrails Quote Link to comment Share on other sites More sharing options...
dunesovertrails Posted September 1, 2012 Report Share Posted September 1, 2012 (edited) a trx450r will beat a stock shee. a 250r, with a 310 kit should destory a stock shee. I think hes talking about a 4 stroke trx 250. http://powersports.honda.com/2013/trx250x.aspx Edited September 1, 2012 by dunesovertrails Quote Link to comment Share on other sites More sharing options...
gotta_goatsfast Posted September 1, 2012 Report Share Posted September 1, 2012 No, I'm willing to bet its a 250r. The 310 top end is very popular for the 250r. And yes, a properly setup 310r is going to be fast. A stock shee will not keep up. Also, you're not doing yourself any favors by running such a large carburetor on such a small and mild motor. I suggest picking up a pair of 28mm keihins. Should you decide to run a dune/drag ported 4 mill stroker, then those carbs would work for you. I wonder how a banshee engine would fit in a 250r roller? Quote Link to comment Share on other sites More sharing options...
87BRBanshee Posted September 2, 2012 Author Report Share Posted September 2, 2012 No, I'm willing to bet its a 250r. The 310 top end is very popular for the 250r. And yes, a properly setup 310r is going to be fast. A stock shee will not keep up. Also, you're not doing yourself any favors by running such a large carburetor on such a small and mild motor. I suggest picking up a pair of 28mm keihins. Should you decide to run a dune/drag ported 4 mill stroker, then those carbs would work for you. I wonder how a banshee engine would fit in a 250r roller? Well ive got a set of T'5's on the way, Would this help with the carbs? What are some downfalls to running a carb that big? Quote Link to comment Share on other sites More sharing options...
mike0chek Posted September 2, 2012 Report Share Posted September 2, 2012 Well ive got a set of T'5's on the way, Would this help with the carbs? What are some downfalls to running a carb that big? pretty sure it will kill most of your low end power Quote Link to comment Share on other sites More sharing options...
gotta_goatsfast Posted September 2, 2012 Report Share Posted September 2, 2012 Well ive got a set of T'5's on the way, Would this help with the carbs? What are some downfalls to running a carb that big? The carbs won't make any more peak power than 28mm pwks jetted spot on. You're motor doesn't consume as much air as a larger one. Less consumption can be translated into less air flow. Carburetors work off the venturi effect. The venturi creates a low pressure across the main jet orfice (which is also partially plugged by the needle during part throttle riding). This slight vacuum draws fuel up through the orfice and atomizes with the oncoming air. The stronger the "signal" across the jet, the more fuel it draws and the better it atomizes. It also makes tuning a LOT easier. A weak signal across the jet makes tuning harder (especially at low and mid throttle position) and results in "lazy" or "mushy" power feel because of the poor tuning and fuel atomization. What you WILL feel with 28mm PWKs is the same top end with crisp throttle feedback and a more lively low and midrange. Again, running a piped banshee against a good running 310r (assuming the honda is a 2 stroke since you haven't told us R or X) is suicide.... unless you don't take it seriously and like to play around (which I advise because there's ALWAYS someone faster). Smaller carbs, true your crank, port your cylinders to work with the T5s, and get custom cut domes. You won't believe the difference. After that, you'll realize how bad the banshee's suspension is in stock form. Then its onto a-arms, shocks, ect.... Quote Link to comment Share on other sites More sharing options...
bebetekbanshee358 Posted September 2, 2012 Report Share Posted September 2, 2012 The carbs won't make any more peak power than 28mm pwks jetted spot on. You're motor doesn't consume as much air as a larger one. Less consumption can be translated into less air flow. Carburetors work off the venturi effect. The venturi creates a low pressure across the main jet orfice (which is also partially plugged by the needle during part throttle riding). This slight vacuum draws fuel up through the orfice and atomizes with the oncoming air. The stronger the "signal" across the jet, the more fuel it draws and the better it atomizes. It also makes tuning a LOT easier. A weak signal across the jet makes tuning harder (especially at low and mid throttle position) and results in "lazy" or "mushy" power feel because of the poor tuning and fuel atomization. What you WILL feel with 28mm PWKs is the same top end with crisp throttle feedback and a more lively low and midrange. Again, running a piped banshee against a good running 310r (assuming the honda is a 2 stroke since you haven't told us R or X) is suicide.... unless you don't take it seriously and like to play around (which I advise because there's ALWAYS someone faster). Smaller carbs, true your crank, port your cylinders to work with the T5s, and get custom cut domes. You won't believe the difference. After that, you'll realize how bad the banshee's suspension is in stock form. Then its onto a-arms, shocks, ect.... . Everything this dude said....god gave you two ears and one mouth......LISTEN!!!!!!!!!! Quote Link to comment Share on other sites More sharing options...
gotta_goatsfast Posted September 2, 2012 Report Share Posted September 2, 2012 . Everything this dude said....god gave you two ears and one mouth......LISTEN!!!!!!!!!! Yet, we have 10 fingers to type but only 2 eyes to read? There's a flaw in the system! lol Quote Link to comment Share on other sites More sharing options...
mike0chek Posted September 2, 2012 Report Share Posted September 2, 2012 you said you just fried your top end right? most likely from your carbs being too big and not pulling in enough full on the low end. no i did not say that lol and there def not too big for my setup lol Quote Link to comment Share on other sites More sharing options...
87BRBanshee Posted September 2, 2012 Author Report Share Posted September 2, 2012 The reason the left cylinder has no compression is cuz there was a tear in the carb boot between the carb and motor :/ Quote Link to comment Share on other sites More sharing options...
gotta_goatsfast Posted September 2, 2012 Report Share Posted September 2, 2012 Pull the head and inspect for signs of deto. Quote Link to comment Share on other sites More sharing options...
87BRBanshee Posted September 2, 2012 Author Report Share Posted September 2, 2012 The carbs won't make any more peak power than 28mm pwks jetted spot on. You're motor doesn't consume as much air as a larger one. Less consumption can be translated into less air flow. Carburetors work off the venturi effect. The venturi creates a low pressure across the main jet orfice (which is also partially plugged by the needle during part throttle riding). This slight vacuum draws fuel up through the orfice and atomizes with the oncoming air. The stronger the "signal" across the jet, the more fuel it draws and the better it atomizes. It also makes tuning a LOT easier. A weak signal across the jet makes tuning harder (especially at low and mid throttle position) and results in "lazy" or "mushy" power feel because of the poor tuning and fuel atomization. What you WILL feel with 28mm PWKs is the same top end with crisp throttle feedback and a more lively low and midrange. Again, running a piped banshee against a good running 310r (assuming the honda is a 2 stroke since you haven't told us R or X) is suicide.... unless you don't take it seriously and like to play around (which I advise because there's ALWAYS someone faster). Smaller carbs, true your crank, port your cylinders to work with the T5s, and get custom cut domes. You won't believe the difference. After that, you'll realize how bad the banshee's suspension is in stock form. Then its onto a-arms, shocks, ect.... Is porting nessassary with the T5's? I plan to do porting in the future maybe around spring time or mid winter, So If i get the 28mm pwk's the bike should run fairly good? And yea the trx is a 250r Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted September 2, 2012 Report Share Posted September 2, 2012 No, I'm willing to bet its a 250r. The 310 top end is very popular for the 250r. And yes, a properly setup 310r is going to be fast. A stock shee will not keep up. Also, you're not doing yourself any favors by running such a large carburetor on such a small and mild motor. I suggest picking up a pair of 28mm keihins. Should you decide to run a dune/drag ported 4 mill stroker, then those carbs would work for you. I wonder how a banshee engine would fit in a 250r roller? They fit pretty sweet! I have seen two. Well actually 3 but the third was one of TZ racin's customers chromoly TT chassis with 250r body. The one I saw in a stock Honda frame was a pretty tame build and the one in a laegers 250R frame(not a banshee hybrid)was just friggin sweet! Quote Link to comment Share on other sites More sharing options...
gotta_goatsfast Posted September 2, 2012 Report Share Posted September 2, 2012 No, not nessassary. The T5s work fine with stock ports (more people probably use T5s on stock ports than modified ones). But it'll take more than a stock cylinder (even full bolt on) to outrun a good 310r setup. Quote Link to comment Share on other sites More sharing options...
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