zillakilla02 Posted September 19, 2015 Report Share Posted September 19, 2015 Hey bhq so the banshee was running tittays in august I mean spot on perfect I had the mains dialed in and she ripped but the last few weeks it all of a sudden got really lean on wide open throttle to the point where it has me worried. since I had 160 mains in during the summer and that is what it liked best I thought maybe just because it cooled off slightly that I just needed to go up a few sizes. Well I'm up to 185 mains and it's still lean when I plug chop. I just did a leakdown test because I figured there must be a leak and it's holding 6 psi like a champ all day long. Is it possible that a leak only occurs when it's hot or when it's under full throttle? Or should the leakdown test have failed if there was any leak? It really hasn't cooled off temperature wise all that much it was probably 85°F in august and now it's maybe 60s here in wisconsin. Does the drop in temp require that much of a jetting change? I didn't think 20 degrees would cause it to lean out that much even with 185 mains compared to 160s... I'm going to keep going up with the mains I just haven't had much experience with temperature changes and how much the mains will differ. Thanks guys for any advice 353cc dune port with boost ports 34mm keihin pj carbs 185 mains 45 pilots Chariot reed cages, chariot intake manifold, boyesen power reeds, uni dual stage direct mount filters, rocket exhaust Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
CycleTech Posted September 22, 2015 Report Share Posted September 22, 2015 If both carbs are running lean then check for a fuel starvation problem. Fuel tank vent? Quote Link to comment Share on other sites More sharing options...
zillakilla02 Posted September 22, 2015 Author Report Share Posted September 22, 2015 If both carbs are running lean then check for a fuel starvation problem. Fuel tank vent?Thanks I will check the vent. Can an inline fuel filter cause too much restriction? It's only a couple months old and never had that problem before and looks clean. Also another possibility is that my pickup coil is too big of gap can that cause a lean condition wide open throttle and a stutter? Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
Bennett131 Posted September 22, 2015 Report Share Posted September 22, 2015 Thanks I will check the vent. Can an inline fuel filter cause too much restriction? It's only a couple months old and never had that problem before and looks clean. Also another possibility is that my pickup coil is too big of gap can that cause a lean condition wide open throttle and a stutter? Sent from my SAMSUNG-SM-G870A using Tapatalk It is possible for a fuel filter to do that, but it would have to be a pretty long pull. Quote Link to comment Share on other sites More sharing options...
zillakilla02 Posted September 22, 2015 Author Report Share Posted September 22, 2015 It is possible for a fuel filter to do that, but it would have to be a pretty long pull.Yeah this is pretty much instant as soon as I crack it wide open. Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
CycleTech Posted September 22, 2015 Report Share Posted September 22, 2015 Check the carb vents also. 1 Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted September 22, 2015 Report Share Posted September 22, 2015 No way that motor will eat 180's main jets. You got other issues for sure. Quote Link to comment Share on other sites More sharing options...
zillakilla02 Posted September 22, 2015 Author Report Share Posted September 22, 2015 No way that motor will eat 180's main jets. You got other issues for sure.That's what I thought so I got out the leakdown tester and it held like a champ for over 20 minutes until I let off the pressure. It's gotta be somethin with the bowls not being full. You know what the spec is for float height on keihin 34mm pj's? Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
zillakilla02 Posted September 22, 2015 Author Report Share Posted September 22, 2015 And both cylinders are the same color for plugs Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
zillakilla02 Posted September 22, 2015 Author Report Share Posted September 22, 2015 Unless it's a leak that only occurs under full load if that's possible Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted September 22, 2015 Report Share Posted September 22, 2015 Pj are 16mm float height make sure you measure them properly tilted on 45 just so float tab touches needle pin Quote Link to comment Share on other sites More sharing options...
zillakilla02 Posted September 22, 2015 Author Report Share Posted September 22, 2015 Pj are 16mm float height make sure you measure them properly tilted on 45 just so float tab touches needle pinOk thanks will do Sent from my SAMSUNG-SM-G870A using Tapatalk Quote Link to comment Share on other sites More sharing options...
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