I've used WD-40 on bike chains for years with no evident issues. I clean mine with a "Grunge Brush", originally designed for dirt bike chains, with various brands of chain cleaner. WD-40 applied mainly to prevent side plate rust.
I'd heard the same thing old fart did - no WD-40 on your O-ring chain. I've always used kerosene to clean and 90-weight to lube.
Chain lube and also maintaining the proper slack on the chain are very important.
I have been using kerosene to clean and either 90W oil or regular chain lube. Never had any problems. The chain brush works wonders.
What i've used WD-40 for has been to create a little film on the rear rim so that any excess lube doesn't stick to the rim after riding following the cleaning lubing.
Here is a very good video on chain cleaning/adjusting specific to the N1K
Easy Motorcycle Chain Adjustment & Cleaning - Step by Step - YouTube
Chain lube and also maintaining the proper slack on the chain are very important.
I have been using kerosene to clean and either 90W oil or regular chain lube. Never had any problems. The chain brush works wonders.
What i've used WD-40 for has been to create a little film on the rear rim so that any excess lube doesn't stick to the rim after riding following the cleaning lubing.
Here is a very good video on chain cleaning/adjusting specific to the N1K
Easy Motorcycle Chain Adjustment & Cleaning - Step by Step - YouTube