New to me 1985 TRX250

Hi everyone, I am new on the forum board. I recently picked up a 1985 TRX250 for $350 not running. To me that seemed reasonable, after rebuilding the carb and cleaning out the gas tank, new fuel lines, new plug and a fresh oil change it is running great. Cranks over on first kick start or with electric start either way. The biggest issue I am having is the rims are beat up pretty bad and i can’t find anything to fit the 4/130 bolt pattern for the front. I hate that drag racing look of the huge tires in the back and those small tires in the front. There are some cracks in the plastic, but I have some ideas on how to fix that. Haven’t checked the brake lights yet but I figured that was an easy fix if I am ok with aftermarket stuff. Front brakes have to be pumped but can’t get into master cylinder, back brakes are adjusted good b/c those will almost throw me off the thing if I hit them hard. I think for its age this thing is in great shape, and for hauling dear out of the woods and an occasional ride with my brother in law I can’t beat a nicely running ATV for only $425 total after parts and all. I have a few questions of anyone cares to give some free advice.

1) I know I am missing the tube that goes from the airbox up under the fuel tank. Any idea of something I can use for that? I was thinking of some type of flex hosing but not sure what will work.

2) Front headlight wiring is shot and can’t find a light bulb for the light, any ideas on a light that I can replace the entire front headlight with?

3) Any ideas for front wheel adapter or a way to get wheels that won’t cost me a small fortune?

4) Master cylinder won’t open due to rounded rusty screws, front brakes work but I have to pump them, any idea how to open Master cylinder?

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