Guys, Guys, Guys... Believe me-- a CR85 front end is NOT a bolt up affair on the 150F. You need to get Reger Engineering to do some machining to the 85 tree, then press the stem out about a quarter inch to get it on the 150F. Then you have the issue of a steering stop. The setup Reger uses is hokey as all getup. To do it correctly, you'd need to weld a stop to the 150F frame. As far as the key switch goes, it can be unplugged completely and isn't necessary. You'll have a great time trying to get somebody at Reger to answer the telly. The guy works out of his garage and is nearly impossible to get ahold of.
You'll need to get the entire 85 front end including the wheel and brakes. That is usually a $4-500 item on Ebay. Then you've got to remember that a 150F weighs 100 lbs. more than a CR85. In order to match the new front to the rear spring rate of 9.0-- you'll need to get a set of .44 Race Tech or Cannon Racecraft springs at $109 + shipping. Wait! You're not finished yet... You'll need to get the forks revalved to handle the rebound of the stiffer springs.
Done now? Nope-- the 150F has about 10.5 inches of ground clearance, The CR85 forks have 10.8 inches of travel... you know what that means? When you bottom the forks, you'll be bottoming the engine cases on the ground as well. You'll need to have bigger bump stops installed in the 85/150R forks to limit the travel to 10 inches or less (the rear only has 9 inches of travel), unless you want to have Parma Dave fixing flattened out frame cradle tubes.
I've been racing a 150F in the pit bike races for a couple years now, and I can assure you the best and easiest way to improve the bike would be to put the correct forks that belong on the bike, back on the bike-- and get the correct spring rates. Then, have John Hlebo (Hlebo Bros. Suspension) revalve both the forks and shock for about $350 shipped. It will work as well as a 150F can work w/o going with an aftermarket shock and 85/150R forks. Even if you do properly upgrade the front, the stock shock still stinks big time on that bike. If ya want to PM me-- I can help ya with it-- I know those 150's inside and out. You can even come ride mine around to see how the Hlebo setup feels before you spend the money. --L*64