I use the NGK 5129 DPR7EA-9 in my GL-1500, pretty sure that what hey came with.
He has a 1800. They use different plugs.
Stick with the NGK's. I have never had a problem with them. DO NOT get them off E Bay! There are way to many fake NGK plugs that will cause problems there. You can also check your local auto parts stores. They may have them or can also order them.
2012 GL 1800
1988 GL 1500
1977 GL 1000
2012 KLR 650
Last edited by snowmoer; 08-23-2019 at 10:43 AM.