tooling

You guys! did any one of you try a richer cutaway in your carbs!,Idont see anything in the forum where anyone has tried them! The closest thing was locco guy with trying stock carbs but that dont change the flow assemetryof the slide itself , It means nothing! someone try it and then rejet and post what your results!

The spacer plate is for port timing so the builder does not have to grind so much in the top of the transfer ports to get to the 130 degree open duration,(not enough wall thickness, will break through on a banshee motor to get it right)134 degrees appox is what you want with larger volume pipes,this does lower crank case presure slighty but not enough that you would notice on a banshee motor,the spacer has nothing to do with the head design other than more work to machineing the head, put a degree wheel on the fly wheel and bring to top dead center and check the port timing to make sure you are @ 79 to 80 degree`s on the exuast and @ 113 after top dead center on the tranfers,if this is close and you have tryed all jetting combo`s, most importantly richer cutaways, and you still have a dead spot check to make sure that the transfers have been ground the same on all of them,this where you go from 70 to 90 hp check to see that the upswept angle is no greater than 3 degrees and that the pitch is towards the center (stock sucks pitched up and back) if this is all good then check your head, put a piece of SOFT lead on each side of the top of the piston directly over the rist pin and roll it back and forth and measure the lead it should be .o40 on the outer dia and tapered up to thicker towards the center of the piston 1 degree,and 8 mm long, then make sure you have the piston on top dead center and check with a burrette gage, or a sureange gage and check to see the uncorrected volume, it should be @16 cc ,this is good for 93 octane

To adjust the cutaway (witch is a fixed jet)take the slide out of the carb and set it on a flat surface just like it is positioned in the carb ,you will see the angle, take a height gage and find the highest part of the angle scribe up about .020 and make a line, then set up the slide and grind zero from the bottom of the slide angle to the new scribed line , this leans out the the the flow, and the opposite is true ,you can grind off the bottom of the slide to make it richer but that requires makeing sure you can adjust your cable and idle slot works. (slide is down)THINK ABOUT WHAT YOU ARE DOING !,I say this because it cost,s a butt load to to buy slides to try, (to get rid of a bog!. ) sugest to get the lowest angle slde and work with that, sounds like most of you need a richer cut away!

change your cut away angle on your slide up a degree, and then retune carbs, im not sure of how the carbs you guys are using are desighned but if you take off the air box you should see on the bottom side off the carbs some holes, the one that feeds air to the piolet sercutry is the air correction circut ,use a smaller number jet or plug it and give that a try!