1 Fitting replacement HES Tue Dec 29, 2020 6:04 pm
Dai
Life time member
I've just done this, but wondered how anyone else does it. My sequence was:
- turn the back plate up and hit the pointy-bits of the rivets with a short piece of round bar to flatten them slightly
- hit the newly flattened bits in the middle with a centre-punch, then put a 4mm drill into them until the rivet spins off
- using the same centre-punch, hit the rivets until they pop out of the back plate. You'll probably break the old HES but it doesn't matter at this point.
From here on in - mounting the new HES - was a bit of a puzzler. From playing with the OEM HES, I found that you could easily punch out the rivets without breaking anything. I don't have an anvil or a recessed punch of the right size (nor can I make them - no lathe), so hitting the new rivets and spreading them like the OEM ones was a no-go. The rivets on the new HES seemed to be moulded in, so they weren't going to punch out like the OEM ones. Cutting a long and sometimes frustrating story short, I did eventually resort to driving them out from the back with a hammer and punch and found that what appeared to be moulded plastic was actually epoxy resin. Bit of a heart-stopping moment though...
To actually fix the HES to the mounting plate, I took four 4mm button-head Allen screws and filed down the diameter of the heads until they dropped into the rivet recess in the HES. I also skimmed across the top of the button to make sure it was below the floor of the HES itself. I used Loctite threadlock on the butchered Allen screws and tightened the nut as far as I dared. I then hacksawed the threads flush with the nuts and ran a fine file over them to remove any sticky-up-and-cut-your-fingers bits. To add the belt to the braces, I centre-punched the nut to the screw. They is NOT coming off.
So... how do you guys refit the new HES?
- turn the back plate up and hit the pointy-bits of the rivets with a short piece of round bar to flatten them slightly
- hit the newly flattened bits in the middle with a centre-punch, then put a 4mm drill into them until the rivet spins off
- using the same centre-punch, hit the rivets until they pop out of the back plate. You'll probably break the old HES but it doesn't matter at this point.
From here on in - mounting the new HES - was a bit of a puzzler. From playing with the OEM HES, I found that you could easily punch out the rivets without breaking anything. I don't have an anvil or a recessed punch of the right size (nor can I make them - no lathe), so hitting the new rivets and spreading them like the OEM ones was a no-go. The rivets on the new HES seemed to be moulded in, so they weren't going to punch out like the OEM ones. Cutting a long and sometimes frustrating story short, I did eventually resort to driving them out from the back with a hammer and punch and found that what appeared to be moulded plastic was actually epoxy resin. Bit of a heart-stopping moment though...
To actually fix the HES to the mounting plate, I took four 4mm button-head Allen screws and filed down the diameter of the heads until they dropped into the rivet recess in the HES. I also skimmed across the top of the button to make sure it was below the floor of the HES itself. I used Loctite threadlock on the butchered Allen screws and tightened the nut as far as I dared. I then hacksawed the threads flush with the nuts and ran a fine file over them to remove any sticky-up-and-cut-your-fingers bits. To add the belt to the braces, I centre-punched the nut to the screw. They is NOT coming off.
So... how do you guys refit the new HES?
__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500