I am new here and I have just purchased a used DRZ400SM. The mods are as follows:
Athena big bore kit
MRD/SSW exhaust without quiet insert
Aftermarket cams (previous owner could not remember which cams because they were installed by the owner before him)
E model CDI
The bike runs well but there is excessive popping during deceleration. I have searched and realize that some decel popping is normal but this is excessive. I have checked the valve adjustment, performed a cylinder leak-down test, checked for vacuum and exhaust leaks, everything seems OK, oh and the bike does not have a 'Pair' Valve. So with that being said I was hoping some of the many experts here could verify my jetting specs.
The current carb jetting specs are as follows:
Altitude: 3740 ft
Avg Temp: 53 deg F
Fuel: 93 octane pump gas
Main Jet: 155
Pilot Jet: 48
Main Air Jet: 200
Pilot Air Jet removed
Needle: EMP position 6
Air Screw: 1 3/4 turns out
O-Ring mod has be done
You help is greatly appreciated!
Edited by Clint E., 21 February 2012 - 07:27 AM.