So I tried to upload a quick video to aid, but I'm not sure if it worked or not...
What's happening is all 4 carbs are backfiring at random times and at random rpm's... this would indicate to me a lean condition or incorrect timing normally.
Heres what I have done...
-compression tested 200psi on all 4 cylinders
-leakdown is zero
-valve lash is in spec on all valves
-timing belt is good and a pretty new oem Honda belt
-static timing is good, and dynamic timing is correct with a timing light
-intake boots weren't bad but I replaced them with brand new ones anyway
-the fuel pump is putting out well within the spec (and bike does the same thing wether the fuel intake is coming from the tank or being bottle feed)
-I took the cut off valve diaphragms out and inspected them (they and the sealing o-rings are all in great shape)
-took all 4 carbs completely apart, inspected and cleaned them out, all 4 slide diaphragms are in good shape and have vacuum (and function properly when you push them up with your finger and let them drop)
-carbs have been synced
-all floats are working correctly, and with the carb on a bench when I feed the inlet tubes with a bottle all 4 fill up and don't overflow
-I have completely removed the system that breathes fresh air over the exhaust ports and blocked the holes over the exhaust ports
-I have an oem Honda manual and went through the ignition troubleshooting setup, all points at the icm for the sidestand switch, neutral switch, and pulse generator check out good
i have done a ton to this bike, including a 40amp alternator upgrade (it's a 95'), race tech gold valves and springs in the front, works piggyback in the back, fresh paint on all the plastics.... but this running issue has me at a loss at this point... any suggestions would be much appreciated
What's happening is all 4 carbs are backfiring at random times and at random rpm's... this would indicate to me a lean condition or incorrect timing normally.
Heres what I have done...
-compression tested 200psi on all 4 cylinders
-leakdown is zero
-valve lash is in spec on all valves
-timing belt is good and a pretty new oem Honda belt
-static timing is good, and dynamic timing is correct with a timing light
-intake boots weren't bad but I replaced them with brand new ones anyway
-the fuel pump is putting out well within the spec (and bike does the same thing wether the fuel intake is coming from the tank or being bottle feed)
-I took the cut off valve diaphragms out and inspected them (they and the sealing o-rings are all in great shape)
-took all 4 carbs completely apart, inspected and cleaned them out, all 4 slide diaphragms are in good shape and have vacuum (and function properly when you push them up with your finger and let them drop)
-carbs have been synced
-all floats are working correctly, and with the carb on a bench when I feed the inlet tubes with a bottle all 4 fill up and don't overflow
-I have completely removed the system that breathes fresh air over the exhaust ports and blocked the holes over the exhaust ports
-I have an oem Honda manual and went through the ignition troubleshooting setup, all points at the icm for the sidestand switch, neutral switch, and pulse generator check out good
i have done a ton to this bike, including a 40amp alternator upgrade (it's a 95'), race tech gold valves and springs in the front, works piggyback in the back, fresh paint on all the plastics.... but this running issue has me at a loss at this point... any suggestions would be much appreciated