Fellow Airheads,
This past weekend I spent all of Saturday troubleshooting and working on my 1982 R65 at the Culpeper, VA Airhead Tech meetup. I got to meet some awesome and passionate people. The tools and resources were insane:
The main problem right now is the left cylinder is cold and not firing. Occasionally, the cylinder has pre-ignition and the ping is so violent - it knocks the carb off. The bike runs great but just on one side.
If you look closely, the pings in the video knock the carb off yet the bike still is able to run.
(sorry for the shakiness, the bike was vibing the phone)
The bike has Mikuni VM34 Round Slide Carbs jetted at:
Needle: 6DH3 | 3rd Slot
Needle Jet: 159-P0
Main Jet: AB180 -> moving to 210 (according to Bill @ Rocky Point Cycle)
Pilot Jet: 35 -> moving to 40 (according to Bill @ Rocky Point Cycle)
Slide Cut: 3.0
We have eliminated the following problems:
Valve clearances - set to 0.008|0.004
Compression - 120 psi each side
Leak down - no leakage
Spark plugs - gapped and arcing
Carbs - we switched LH/RH carbs and same problem occured - right side was firing and hot - left side cold
Checked distrubtor & cap resistance
Removed exhaust and checked for air flow
More information:
The bike was cranked over several times with the ungrounded and empty caps.
The bike was able to idle and static timing was checked (with strobe light) on the left side.
Is it possible to show 'S' for static timing on a side that isn't firing?
When running 2-3k rpm, the right side would be close to ~2x hotter than the left side.
Near sunset, we were advancing/retarding the Motorrad Hall Sensor and it felt like the left side began to fire a bit.
Thanks to everyone at the meetup!
Suggestions?
-Andre
This past weekend I spent all of Saturday troubleshooting and working on my 1982 R65 at the Culpeper, VA Airhead Tech meetup. I got to meet some awesome and passionate people. The tools and resources were insane:
The main problem right now is the left cylinder is cold and not firing. Occasionally, the cylinder has pre-ignition and the ping is so violent - it knocks the carb off. The bike runs great but just on one side.
If you look closely, the pings in the video knock the carb off yet the bike still is able to run.
(sorry for the shakiness, the bike was vibing the phone)
The bike has Mikuni VM34 Round Slide Carbs jetted at:
Needle: 6DH3 | 3rd Slot
Needle Jet: 159-P0
Main Jet: AB180 -> moving to 210 (according to Bill @ Rocky Point Cycle)
Pilot Jet: 35 -> moving to 40 (according to Bill @ Rocky Point Cycle)
Slide Cut: 3.0
We have eliminated the following problems:
Valve clearances - set to 0.008|0.004
Compression - 120 psi each side
Leak down - no leakage
Spark plugs - gapped and arcing
Carbs - we switched LH/RH carbs and same problem occured - right side was firing and hot - left side cold
Checked distrubtor & cap resistance
Removed exhaust and checked for air flow
More information:
The bike was cranked over several times with the ungrounded and empty caps.
The bike was able to idle and static timing was checked (with strobe light) on the left side.
Is it possible to show 'S' for static timing on a side that isn't firing?
When running 2-3k rpm, the right side would be close to ~2x hotter than the left side.
Near sunset, we were advancing/retarding the Motorrad Hall Sensor and it felt like the left side began to fire a bit.
Thanks to everyone at the meetup!
Suggestions?
-Andre