JasonsBanshee Posted July 11, 2009 Report Share Posted July 11, 2009 I bought a set of 35mm PWK carbs off ebay and they didn't tell me they were set up for alcohol. I believe they are alcohol because the main jet hole diameter is gigantic and one float is cut off. I don't know what all is involved in setting carbs up for alcohol so I don't know what I need to undo to set them back up on gas. Quote Link to comment Share on other sites More sharing options...
Darthwall Posted July 11, 2009 Report Share Posted July 11, 2009 I think your screwed man lectrons are the only carbs you can switch back to gas I think once the work is done its done Quote Link to comment Share on other sites More sharing options...
JasonsBanshee Posted July 11, 2009 Author Report Share Posted July 11, 2009 I think your screwed man lectrons are the only carbs you can switch back to gas I think once the work is done its done That's not good. I can always sell them or contact the seller to see about returning them but I want to make sure that they can't be reversed before I jump the gun. Quote Link to comment Share on other sites More sharing options...
bonbon Posted July 11, 2009 Report Share Posted July 11, 2009 I think you are screwed. Keihns have to have the dump tube drilled out as it is not removable itself. If it were Mikuni you can buy different sized dump tubes and switch back and forth between gas/alky. Quote Link to comment Share on other sites More sharing options...
JasonsBanshee Posted July 11, 2009 Author Report Share Posted July 11, 2009 I'm not really sure what the dump tube is. What exactly is it and where can I find it in the carb? I looked around on the carbs and did not see anywhere that appeared to be drilled out, unless they did a really clean job. Quote Link to comment Share on other sites More sharing options...
bonbon Posted July 11, 2009 Report Share Posted July 11, 2009 The dump tube is where your needle drops into and the main jet screws into the bottom of. Quote Link to comment Share on other sites More sharing options...
JasonsBanshee Posted July 11, 2009 Author Report Share Posted July 11, 2009 Is the thread pattern the same for stock mikuni jets and stock pwk jets? If so I can screw in a mikuni to see if in fact it has been drilled out. It doesn't appear to have been but I've never messed with Keihin carbs so I have nothing to compare it to. The only reason I say they look like alky carbs is because the jet hole is 2.5mm in diameter at least and one float has been removed. Quote Link to comment Share on other sites More sharing options...
bonbon Posted July 11, 2009 Report Share Posted July 11, 2009 Is the thread pattern the same for stock mikuni jets and stock pwk jets? If so I can screw in a mikuni to see if in fact it has been drilled out. It doesn't appear to have been but I've never messed with Keihin carbs so I have nothing to compare it to. The only reason I say they look like alky carbs is because the jet hole is 2.5mm in diameter at least and one float has been removed. Not sure on the threads deal. Find yourself a drill bit or something that is .125" (1/8") in diameter and see if it fits. If I remember that is a common size that the dumps are drilled to. That or .120", I can't remember for sure. Quote Link to comment Share on other sites More sharing options...
JasonsBanshee Posted July 11, 2009 Author Report Share Posted July 11, 2009 The thread size for the main is definitely an 1/8" hole. So I'm guessing they don't make jets for to work in the 1/8" theads with the proper jet size. Quote Link to comment Share on other sites More sharing options...
bonbon Posted July 11, 2009 Report Share Posted July 11, 2009 The thread size for the main is definitely an 1/8" hole. So I'm guessing they don't make jets for to work in the 1/8" theads with the proper jet size. Not the thread size, but the piece of brass above where the main would screw in is what I am talking about. i.e. the size of the hole in the main jet not the threads. So the size of the hole through the dump tube. I'm not very good at explaining things let me go find a diagram. http://www.sudco.com/Diagrams323728/exptm.gif The part that is drilled out and not changeable in a PWK is 37 in this drawing of a Mikuni TM carb. Quote Link to comment Share on other sites More sharing options...
JasonsBanshee Posted July 11, 2009 Author Report Share Posted July 11, 2009 Yea, it's an 1/8" there too. It's an 1/8" almost all the way to the top of the brass tube. I can fit an 1/8" bit up to about a 1/4" from the top. So in other words, the bit fits in the tube and then stops about 1/4" from going all the way through the tube. They also have EGN needles. So they're useless on gas. That sucks, I guess I'll sell them. I got a decent deal on them so if I can get what I paid for the I'll be satisfied. Thanks a lot for your help man! Quote Link to comment Share on other sites More sharing options...
1996dragshee Posted July 11, 2009 Report Share Posted July 11, 2009 If they are in fact pwks than you are stuck with them being alky carbs. Once they are set up for alky there is no going back to gas on these carbs.As stated they are drilled and obviously you cant put the material back in. Contact the seller for a refund and/or open a claim stating they're not as described or just list them back up for sale staing what you know about them Quote Link to comment Share on other sites More sharing options...
JasonsBanshee Posted July 12, 2009 Author Report Share Posted July 12, 2009 If they are in fact pwks than you are stuck with them being alky carbs. Once they are set up for alky there is no going back to gas on these carbs.As stated they are drilled and obviously you cant put the material back in. Contact the seller for a refund and/or open a claim stating they're not as described or just list them back up for sale staing what you know about them I'll just sell them. I posted them up on the site http://www.bansheehq.com/forums/index.php?showtopic=118296 Quote Link to comment Share on other sites More sharing options...
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