Harley M8 Heat Issues - Heat from the exhaust system can become uncomfortable, especially riding in slow traffic. This issue really comes into focus for those with shorter legs. I had heat issues on my 110 break out. I had them install the hd oil cooler and a jims cooling fan. I was getting caught on i95 and it was shutting down on me about 30. The oil gets hotter with no oil cooler to dissipate the heat. This kind of heat will eventually cause cracks in the head (most likely between the exhaust ports), prematurely worn valve guides, possible coking of oil, piston ring failure, and other possible problems. 2025 water cooled engines have more affective cooling that the 2025 oil cooled engines. I have herd that the new engines are running a higher compression ratio with as. My 2025 road king typically turns in temperatures on the m8 107 of about 210f or sometimes up to 220f, as measured by the hd digital oil dipstick. This is at least 50f cooler. I have a street glide special, 2025 m8 114.
Heat from the exhaust system can become uncomfortable, especially riding in slow traffic. This issue really comes into focus for those with shorter legs. I had heat issues on my 110 break out. I had them install the hd oil cooler and a jims cooling fan. I was getting caught on i95 and it was shutting down on me about 30. The oil gets hotter with no oil cooler to dissipate the heat. This kind of heat will eventually cause cracks in the head (most likely between the exhaust ports), prematurely worn valve guides, possible coking of oil, piston ring failure, and other possible problems.