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Posted by testpilot
- September 03, 2013, 18:10:45 PMI just returned from a 1,200 mile trip on my 05 Drifter 1500 that took me through the hills of WV and VA. I noticed a lot of spark knock on acceleration at speeds of around 75 mph and up while pulling up long grades. I had to either allow my speed to drop off or run it in 4th gear to prevent the pinging. I used 93 octane throughout the trip. At the half way point, I bought a can of Sea Foam and put about 1/3 of it in the tank at the next three fillups without any change in the detonation/pre-ignition. I pulled all four plugs after the trip and they all have a nice light tan color. Spark plugs are NGK DPR6EA-9. Cooling system is full and seems to be working OK. Cooling fan cycles as it should when parked and idling. The bike just turned 10,000 miles this weekend. Any ideas?