cumminnotstrokin Posted January 21, 2011 Report Posted January 21, 2011 (edited) I am redoing the top end of my 97 Banshee, .20 over power lite pistons, head milled 0.40 thou, boysen pro reeds, Uni filter with vent top, and pro circuit pipes. I was using 260 mains with 25 pilots on stock carbs (had it dynoed this way) it ran like a raped ape. the only thing I am changing is having the head milled. Will I need to change my jetting ? Elevation 1800 feet. I ride glamis, Dumont, and Amargosa NV. mainly Thanks Edited January 21, 2011 by cumminnotstrokin Quote
T_Shee Posted January 21, 2011 Report Posted January 21, 2011 wont need to re jet for the head. how much you having it milled? if your compression gets too high you may need to switch fuel. also prolly wanna richen it up if its cold where you are. otherwise you should be fine Quote
T_Shee Posted January 21, 2011 Report Posted January 21, 2011 just saw where you ride. nevermind the cold Quote
cumminnotstrokin Posted January 21, 2011 Author Report Posted January 21, 2011 just saw where you ride. nevermind the cold having .040 thousands milled off. I was told if i keep it below 170 psi i should be able to still run 92 pump fuel. I already mix 100 with pump fuel so both of the banshees run cooler. my wife has an 06 that she insist on keeping stock. the stock jetting suck, it still has that bog before the power band kicks in. what jetting should I use on a bone azz stock bike for my altitude? Quote
gotta_goatsfast Posted January 21, 2011 Report Posted January 21, 2011 The only way to dial your shee (or hers) is to do a plug chop and jet up or down from there. Quote
cumminnotstrokin Posted January 22, 2011 Author Report Posted January 22, 2011 The only way to dial your shee (or hers) is to do a plug chop and jet up or down from there. Thats when you run it wide open for about 1/2 mile on fresh plugs and hit the kill switch and the check color RIGHT??? and I want milk chocolate color right? Quote
gotta_goatsfast Posted January 22, 2011 Report Posted January 22, 2011 Yep. Ride out to an open area. Swap out your plugs for brand new ones. Start it and as quick as you can go through the gears at full throttle. Then kill the engine, close the throttle, and pull in the clutch at the same time and coast to a stop (with the engine off and not spinning). Put your other plugs back in so that you can get back to the shop or garage. First, look at the plug with a good light source and a magnifying glass. If you see specs of aluminum chances are there is some detonation going on in the cylinder. If this is the case, you need to diagnose the issue. Examples could be lean jetting, poor fuel or too low of octane, too much ignition advance, wrong squishband, ect... Second, look at the ground strap. You should see it change color in the middle. If it changes color close to the tip the plug is too cold. If the ground strap changes color down closer to the threads then your plug is too hot. Now that you've inspected your plugs, you need to cut away the threaded portion so that you expose the entire insulation. From there, you should see a milk chocolate colored ring roughly 2mm thick around the base of the insulation. If it is really dark or taller than 2mm you are running rich. Opposite is true if you're lean. You can find plenty of pictures and similar explanations searching here in the jetting forums. Quote
cumminnotstrokin Posted January 22, 2011 Author Report Posted January 22, 2011 (edited) Yep. Ride out to an open area. Swap out your plugs for brand new ones. Start it and as quick as you can go through the gears at full throttle. Then kill the engine, close the throttle, and pull in the clutch at the same time and coast to a stop (with the engine off and not spinning). Put your other plugs back in so that you can get back to the shop or garage. First, look at the plug with a good light source and a magnifying glass. If you see specs of aluminum chances are there is some detonation going on in the cylinder. If this is the case, you need to diagnose the issue. Examples could be lean jetting, poor fuel or too low of octane, too much ignition advance, wrong squishband, ect... Second, look at the ground strap. You should see it change color in the middle. If it changes color close to the tip the plug is too cold. If the ground strap changes color down closer to the threads then your plug is too hot. Now that you've inspected your plugs, you need to cut away the threaded portion so that you expose the entire insulation. From there, you should see a milk chocolate colored ring roughly 2mm thick around the base of the insulation. If it is really dark or taller than 2mm you are running rich. Opposite is true if you're lean. You can find plenty of pictures and similar explanations searching here in the jetting forums. Thanks! Edited January 22, 2011 by cumminnotstrokin Quote
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