There is this hill that banks into a sharp curve where I live. When I am descending that hill I am usually in 5th gear doing like 35 mph and the rpm's are around 1800. I keep it in the higher gear because when I downshift to get the rpm's up there the bike will backfire. I try to avoid the backfiring by leaving it in the higher gear. Please understand that there is no strain on the engine, I am practically coasting. Just before I get into the turn, when the engine will need some higher rpm's, I will downshift. My question is: Am I doing any harm to the engine going downhill at the higher gear but lower rpm's without the engine lugging?