j_rod421 Posted December 30, 2008 Report Posted December 30, 2008 I got my Cub motor running the other day. Took it out for a nice ride. I haven't changed any jetting from the old motor. I'm running some old school 28mm TM Mikuni's. (I know, I know... They have to go! But they have to work for a little while.) It idles fine, but there is a dead spot right before the power curve starts to kick in. It runs like it may be lean, but barely. I say barely because it doesn't get hot, and this dead spot in the mid range right before the top end kicks in I've noticed when the bike was lean before on the old motor. I checked the plugs, they're a crispy brown. Looking at the plugs, I wouldn't guess it to be lean but I just have this feeling. I'm open to suggestions here. P.S. If anybody out there has the factory cylinder set up and considering a change to an aftermarket cylinder set up like the cub, don't think about it, DO IT!! I am still cleaning my britches from how much more power these things make. Quote
firebanshee Posted December 30, 2008 Report Posted December 30, 2008 I got my Cub motor running the other day. Took it out for a nice ride. I haven't changed any jetting from the old motor. I'm running some old school 28mm TM Mikuni's. (I know, I know... They have to go! But they have to work for a little while.) It idles fine, but there is a dead spot right before the power curve starts to kick in. It runs like it may be lean, but barely. I say barely because it doesn't get hot, and this dead spot in the mid range right before the top end kicks in I've noticed when the bike was lean before on the old motor. I checked the plugs, they're a crispy brown. Looking at the plugs, I wouldn't guess it to be lean but I just have this feeling. I'm open to suggestions here. P.S. If anybody out there has the factory cylinder set up and considering a change to an aftermarket cylinder set up like the cub, don't think about it, DO IT!! I am still cleaning my britches from how much more power these things make. Have you tried raising your needles? which in turn means lowering your clips. Quote
j_rod421 Posted December 30, 2008 Author Report Posted December 30, 2008 Have you tried raising your needles? which in turn means lowering your clips. Thats something I considered. If I remember right they are in the center position right now. Where should my air screws be? Quote
firebanshee Posted December 31, 2008 Report Posted December 31, 2008 Thats something I considered. If I remember right they are in the center position right now. Where should my air screws be? I would start off at 1.5 turns and trie it. Quote
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