My honda trx 125 have weak spark I got a new plug but spark is still weak where should I go from here

Sounds like a bad coil.

I've got a TRX125 that I thought had lost it's spark (wouldn't run, and couldn't see the spark when the plug was grounded on the engine block). Then I looked for spark at night, and saw that it was there after all, although still weak. So I tried starting fluid, and it would run on starter fluid. So I cleaned out the carb and now it runs fine. All jets were clean, but there was a little bowl on the carb that the fuel goes through before it goes through the needle valve, and that bowl was full of congealed/nasty fuel.