Here is a hole in the top of the head and it isnt threaded it there a bung and it is in a honda xlr 350 1984

the connector should fit tight and the xlr connector has lock on side . if yours doe not, buy a new cable I use CBI cables, they are American made with Swiss Neutrik connectors. You get what you pay for in cables buy only pro grade cables

the plug has been cross threaded in the hole
remove it and try to get it in properly
you may need a thread tap to reform the thread in the head or a thread insert if the thread is badly damaged

If you had to re-thread the plug hole, likely the plug is not sealing, and you have no compression. You may need to replace the head.

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there should be a threaded bung on radator or on rad pipe remove the bung then fill coolant bottle start the engine when water spurts from the hole replace the bung and fill water bottle to rad with more water only to max level then restart the engine wait for fan to start and stop keeping an eye on temp gauge so it dont go to high job done

I usually put some soapy water on the bungs and push them through the holes with a Phillips head screwdriver.

go to bikebandit.com they might not hane your bike but get close they have pictures of them tore down

For starters, if you don't have the original, in-the-box trimmer thread, you should get the appropriate diameter. Ez enough, you just need .9 to .10 diameter thread are somewhere around that diameter.

Which attachment are you trying to restring, there are several. One will have holes for a "fixed string" with a label that says "stop" on it. This is the fixed string attachment head. Take a piece of fix string, these are pieces of precut string that come with various other tidbits in the box, about 10-12 inches long. insert the string through the head the inserted end comes out the other side. Pull that end out to the edge of the "stop" label. Repeat the process for the metal hole on the other side. That's it, now you are ready to go.

The other trimmer head is a bit more difficult. Unscrew the top sleeve to expose the bare, 2 chambered core - have replacement or original thread ready to go (same diameter as mentioned previously). Once you have removed the top, notice that there are two holes with notches in between the 2 thread chambers. The notches will indicate which chamber you will be sending the thread that will be coming through the holes. Have the thread ready to go, and insert one end all the way through the hole on one side and then out the other. Now you must get the string ends coming out more-or-less equidistant from the two attachment holes so that you get an equal balance of thread being fed out of the head - either with helper holding the attachment head or by just hooking the attachment head around a pole or something, pull the 2 threads through to get them equidistant.

Once you've done this, follow the notches at the respective holes to wind the thread into the proper chamber, as if it were fishing line. Finally, put the head sleeve back

For the other trimmer head

I have a 1986 CMX 450 and have just found thru You Tube that you can use the extra capacity gas tank (3.4 gal) from the 250 to replace the 450 tank. Ordered it and it fits PERFECTLY. No retrofitting needed WHATSOEVER. Cost $99 on Ebay plus shipping. Arrived 2 days earlier than anticipated. VERY VERY HAPPY. I had too many holes in my old tank to even count them. LOL

my advise would be the top quality oil... most epensive in other words because it does better for you engine and lasts longer... great stuff oil.. i swim in it some times