Still waiting on parts to get the big bear going, decided to take 5 minutes to pull the carb and check it out, it is an aftermarket, choke plunger was stuck an hr later after PB Blaster for corrosion and Berryman Chemtool for varnish I finally got it out. Carb was dirty but not as bad as I expected

He is just bypassing having to push the button and pull the lever, im sure it would work fine. I always thought it was kind of annoying the way honda did their reverse switch, but I will say this, it has always worked I have had this honda since the 80s its one of the early TRX 250 a little different from yours, and I have never had to replace the cable or any parts associated with the reverse switch. If your on a tight budget it would certainly be a cheap fix, especially if the parts are expensive. I would do it for a temporary fix, but I like to put things back as close to factory as possible.

Ok, just found a manual for a MXU300, and it's ignition coil is meant to have a primary resistance of three point four to four point one ohms resistance. I'm uploading the manual at the moment, it won't be available till a mod has checked it though..

Yes I believe your MXU is a 12 volt ignition.. Some of the kawasaki use a 12 volt system. The specs you quoted for resistance, were too high for a cdi system, so the bike you were quoting for (the 200 kawasaki), is a 12 volt system. Then, the measurement from your coil is too high resistance to be a cdi coil unless it's shorted out, so it seems your bike is 12 volt ignition, like a kawasaki. Your resistance reading though is a little low which could mean it's partly shorted inside. That would make it draw a higher current than intended, and it would have a weak spark. Try using a set of jumpers and try the coil on 12 v.. it should throw a good spark with it's cap off the lead.

It been a long time since I looked at mine, i would go look but its 100 miles away, the lever should not have moved out of place, you will have to adjust the cable to get it to work correctly. Once you get the parts you will be able to better see how it all goes together.

Do you have the missing parts. 2000 Honda TRX300FW 4X4 OEM Parts | MotoSport.pdf

On the left brake handle there is a button you push, and hold the button down and pull the brake lever at the same time, then push the shifter down to go into reverse, the left lever has 2 cable one for brake and one for reverse. The lever I think you are talking about is for the parking brake, it just hold the lever in the pulled position.