Join Date: Nov 2009
Location: Lander, Wyoming
One can 'thin' the head of the oem drain plug.
Be careful of using automotive oils thinner than 10W40 because they may contain too much of the super-slippery additives to improve fuel mileage, that may cause a motorcycle wet clutch to slip.
You may even have to bevel the 6 corners off of the oem factory tool kit plug socket #92110-1111 to fit properly down into the spark plug pocket.
My most commonly recommended 'go-to' all around tire pressure is 32F / 30R for 150-180 lb riders. Usable from 80mph Interstates to Rocky Mtn. rock piles, I rarely air-down. And always 2 psi more in the skinny front vs fatter rear tire, unless running maximum psi in both.
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 83,000+ miles & counting