James-26 Posted July 17, 2010 Report Share Posted July 17, 2010 I did a search before I even thought about starting a new thread and couldn't really find enough info for my current issue. I'm having problems starting my banshee after it has set for a day or two. My engine is fresh and I have loads of compression, my carbs are clean, and air filter is clean. If I shoot a little premix gas into the carbs she will fire right up on the first kick every time. If I let the engine run for 5 minutes then shut it off for a few hours, then go try and start her again she fires back up on its own first kick? Once it's started it idles and runs like a dream. After the engine is warm and I take it down the road it will bog out a little before hitting the power band like it's getting to much fuel. Now I have not been on it that hard yet cause my engine is fresh and only has maybe 2 hours on it tops. I'm running 32:1 klotz super techniplate for break in then will switch back to 40:1. I'm running 260 mains, needle clips are in the middle, stock pilots, A/F screw is out 1.5 turns. My mods are in my sig. Quote Link to comment Share on other sites More sharing options...
12 0 Clock P I M P Posted July 17, 2010 Report Share Posted July 17, 2010 the more it sits the harder it will be...u are using the choke? sometimes u need to kick it slow just to pump fuel around then give it a good starting kick.....the bog may be in your pilots..or need le adjustment Quote Link to comment Share on other sites More sharing options...
James-26 Posted July 17, 2010 Author Report Share Posted July 17, 2010 the more it sits the harder it will be...u are using the choke? sometimes u need to kick it slow just to pump fuel around then give it a good starting kick.....the bog may be in your pilots..or need le adjustment So kicking hard wont prime the engine and kicking slow will??? Sounds ridiculous but I'll try it. Yes I'm using my choke. Quote Link to comment Share on other sites More sharing options...
12 0 Clock P I M P Posted July 17, 2010 Report Share Posted July 17, 2010 So kicking hard wont prime the engine and kicking slow will??? Sounds ridiculous but I'll try it. Yes I'm using my choke. its just a tactic i seen a lot of people do....just kick slow so u dont kill yOURSELF heavy oil concentraion sitting in the carbs will make for a slow start Quote Link to comment Share on other sites More sharing options...
stockbeast Posted July 17, 2010 Report Share Posted July 17, 2010 try kicking over with the kill switch in the off position that will prime it whether you kick it slow or fast. If you just rebuilt you could have an air leak. The choke tube missing???? Maybe the float needles arent sealing and all your fuel is leaking out when it sits. Or if you just added more power to it which would be more air flow and it could be jetted to lean. Cuz it would run real good lean when warm and have trouble starting cold because that is when it needs the most fuel. these suggestions are just my opinion maybe someone who actually knows what they are talking about will chime in......LOL Quote Link to comment Share on other sites More sharing options...
stockbeast Posted July 17, 2010 Report Share Posted July 17, 2010 try kicking over with the kill switch in the off position that will prime it whether you kick it slow or fast. If you just rebuilt you could have an air leak. The choke tube missing???? Maybe the float needles arent sealing and all your fuel is leaking out when it sits. Or if you just added more power to it which would be more air flow and it could be jetted to lean. Cuz it would run real good lean when warm and have trouble starting cold because that is when it needs the most fuel. these suggestions are just my opinion maybe someone who actually knows what they are talking about will chime in......LOL Quote Link to comment Share on other sites More sharing options...
fastbanshee8 Posted July 17, 2010 Report Share Posted July 17, 2010 It's to lean on the pilots. Most after market exhaust systems require a 27.5 pilot jet in the stock carbs, to be jetted properly. Get some 27.5 pilots, put them in, and start out with your air mixture screws at 1.5 turns open. Adjust them from there, as needed. Quote Link to comment Share on other sites More sharing options...
12 0 Clock P I M P Posted July 17, 2010 Report Share Posted July 17, 2010 It's to lean on the pilots. Most after market exhaust systems require a 27.5 pilot jet in the stock carbs, to be jetted properly. Get some 27.5 pilots, put them in, and start out with your air mixture screws at 1.5 turns open. Adjust them from there, as needed. I agree i just could not remember the size..... Quote Link to comment Share on other sites More sharing options...
James-26 Posted July 17, 2010 Author Report Share Posted July 17, 2010 okay I was thinking I was going to need bigger pilots but wanted to hear it first. I'm also going to make a leak down tester and make sure I dont have an air leak. I don't believe I added any power when I rebuilt it but guess I may have. Removed the boost bottle that was on it when I bought her and added 65mm wiseco pistons. Guys think I should bump my mains up to a 270 or keep them at the 260's? Quote Link to comment Share on other sites More sharing options...
fastbanshee8 Posted July 17, 2010 Report Share Posted July 17, 2010 okay I was thinking I was going to need bigger pilots but wanted to hear it first. I'm also going to make a leak down tester and make sure I dont have an air leak. I don't believe I added any power when I rebuilt it but guess I may have. Removed the boost bottle that was on it when I bought her and added 65mm wiseco pistons. Guys think I should bump my mains up to a 270 or keep them at the 260's? Do a plug chop, once you get the pilots put in, but you should have at least 280, or 290 mains in the carbs. I ran 320 mains with the same setup, but your elevation is going to affect the jetting, also. Quote Link to comment Share on other sites More sharing options...
James-26 Posted July 17, 2010 Author Report Share Posted July 17, 2010 Do a plug chop, once you get the pilots put in, but you should have at least 280, or 290 mains in the carbs. I ran 320 mains with the same setup, but your elevation is going to affect the jetting, also. Damn it I knew I should have waited to order my pilots until I got a reply on the mains. I just ordered my pilots from Vito's guess I can always call him Monday and add the mains. My elevation is around 800 feet. Quote Link to comment Share on other sites More sharing options...
fastbanshee8 Posted July 17, 2010 Report Share Posted July 17, 2010 If you have taken the snorkel off of the lid, I'd say you will end up around 310, or 320 on the mains. You should order mains in sizes from 280-320. It's an addiction. LOL Quote Link to comment Share on other sites More sharing options...
James-26 Posted July 18, 2010 Author Report Share Posted July 18, 2010 If you have taken the snorkel off of the lid, I'd say you will end up around 310, or 320 on the mains. You should order mains in sizes from 280-320. It's an addiction. LOL My last banshee I had 66mm pistons, trail porting, pro circuit exhaust and no air box lid and I was only at 300 mains and 27.5 pilots. Really think I need to be jetting in the 300 range? That is correct im not running the snorkel. Quote Link to comment Share on other sites More sharing options...
fastbanshee8 Posted July 18, 2010 Report Share Posted July 18, 2010 290 mains are what I ran with FMF Fatties, foam air filter in the box, with the lid on. Once I went to a K&N in the box, I had to use 320 mains. Sooner, or later, you're going to need some different sizes of mains. Temperature changes, elevation changes, future mods, and so on. Having only a few different sizes of main jets is going to be a pain, because you'll have to go buy them somewhere, and won't have them right there, when you need them. Quote Link to comment Share on other sites More sharing options...
James-26 Posted July 18, 2010 Author Report Share Posted July 18, 2010 Very true. Looks like im going to order some main jets. I appreciate your help Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.