Does anyone have a good fix for the GX390 exhaust studs? Or can you let me know what I'm doing wrong?
I have 3 GX390 based engines currently in service, 2 genuine Hondas and 1 clone. All these motors seem to have issues with the exhaust studs coming loose, or snapping off completely (that could be from employees over tightening a loose stud). I have tried new hardware, different flavors of thread lock, double nutting, physically distorting the threads, etc.
Has there been any success in heli-coiling the heads, and even upgrading to larger hardware? What about JB Weld as a thread locker? Tap the exhaust port for NPT and run the exhaust system remote mounted?
Right now I have a pile of old heads with broken exhaust studs or bad threads in the stud holes, and I'm sick of mufflers falling off.
Overall the Honda's serve me well, most of the motors are 7-10 years old before the rod locks to the crank, and most of those failures were probably the result of years of neglect, coupled with someone forgetting to check the oil.
I have 3 GX390 based engines currently in service, 2 genuine Hondas and 1 clone. All these motors seem to have issues with the exhaust studs coming loose, or snapping off completely (that could be from employees over tightening a loose stud). I have tried new hardware, different flavors of thread lock, double nutting, physically distorting the threads, etc.
Has there been any success in heli-coiling the heads, and even upgrading to larger hardware? What about JB Weld as a thread locker? Tap the exhaust port for NPT and run the exhaust system remote mounted?
Right now I have a pile of old heads with broken exhaust studs or bad threads in the stud holes, and I'm sick of mufflers falling off.
Overall the Honda's serve me well, most of the motors are 7-10 years old before the rod locks to the crank, and most of those failures were probably the result of years of neglect, coupled with someone forgetting to check the oil.