Nonsense. All the experienced cutters take the guard off. Guards are for novices. Cord will cut image D. Ive cut thicker stuff than that. Blades are very overrated.
Thai roads are numbered by digits 2,3,4. I would only cycle the 3 and 4 digit roads. Very quiet roads and much more enjoyable. I plotted a route from Chiang Rai to Kanchanaburi all on 3 digit roads no highways.
Well some of the back roads are nice. Around Si Sanchanalai. Kanchanaburi would be nice too. The highways would suck. I prefer flat riding to big hills.
Blades need to be sharpened with a grinder or file. Generally though tough cord works better then blades for most tall grass. Use a top down approach to create a hole then swept out.
For small trees use a machete.
What cc is your honda? The 35cc is much better than the 25cc.