pebble in a beer can noise at 70 mph . . .help!
#11
08-23-2011, 03:57 PM
I agree with djl. The more I listen to it it sounds like classic deto. Are you running the stock needle in the cv carb? If so I would change it out for the sporster needle to richen up that cruising area of the fuel circuit. Also at cruising speed and light throttle settings you are running alot of ignition advance. A 95" big bore with 203 cams I would think would definitely need a little more fuel as the stockers are on the edge of too lean when at light throttle. I'm sure djl or someone else may be able to get you the part number for that jet needle.
Last edited by djl; 08-23-2011 at 04:00 PM.
#12
08-24-2011, 08:06 PM
If heads were milles, and 203's installed, if you can't cure the detonation with fuel, you will need to pull some timing in the areas that you are getting the pinging. As DJL questioned, how much did you mill and what pistons. You could be anywhere from 9.5 to 10.5 to one depending on the setup. If you are near 10.0:1 or higher, timing definitely has to be addressed.
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08-29-2011, 02:21 PM
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#16
08-29-2011, 03:41 PM
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