HI, the name is Dev. I recently traded up from a 1996 yz125 to a 1999 YZ400f. The trade was straight up. The 400f was supposed to be leaking gas out of an overflow in the carb and it needed a rear tube. To make the trade seemed like a no-brainer to me. I jumped right into my little project. i ordered a rear tube. And I took the carb completely apart, cleaned and reassembled it. I installed it on the bike. And tried to fire her. I got a couple of back fires out of the carb, that's it. for me that hinted towards timing being out. So, I checked on the cams (which were supposed to be hot cams, they turned out to be stock)..long story short I realized that the intake cam gear had spun on the cam shaft. I ordered I new one. At this point I figured that i might as well disassemble the top end to inspect. The top end is fresh, but since I have the cylinder off i figured I'd give it a quick 5-10 second hone, and lap the valves before i put it back together. So, that's where I'm at with the meat and potatoes.
But the fun is only beginning.
The wiring on the bike is/was hideous. There was electrical tape everywhere. I decided to clean things up and inspect/improve all of the connections under the electrical tape. Upon inspection i found a lot of dead end wires that had bean cut and taped off. And it seemed there were way too many wires to be an mx bike..and I found a voltage regulator on the steering stem. On the opposite side of the CDI box. I immediately thought "this is a bleeping WR". I ran the VIN and it turns out the bike is a 1998 WR400f. It was a pleasant surprise for me..too many reasons to list. I continued with my electrical maintenance. I tested everything coming out of the stator. all was in spec (on the high side). Then, tested the primary ignition and secondary ignition.
Primary spec is .20-.30 ohm. I came up with a 1.0 ohm.
Secondary spec is 9.5-14.3 Kohms. I got 16.27K
So, both are out on the high side. Should this be replaced and could it be causing me problems or have the potential to?
The plug wire where it connects to the boot is wrapped in electrical tape due to a tear. So, replace right?
I have a ton more to cover once I get the top buttoned up. Like getting lights back on the bike for starters. And Im not to familiar with the FCR carb.
But that's it for now. Any help and guidance from some more experienced WR guys would be greatly appreciated.
Oh, and i found some wires coming out of the case right where the transmission would be (they to had been cut off right after plugging into its counterpart). what are these wires?.