had a mud deflector on the very forward end on the guard too, to deflect the mud past the radiator intake & up into your face lol. Might be wrong & was just the 250J or 125J that came with that!!. Had a blue magnum carb on mine--bike was a trade in at work but had a lot of fun on it even though it was dated but about 5 years. I had a frame once or a roller that had--had a kx500 in it. Never saw it as a runner but had nightmares just thinking about it. With your 'H', keep the steering races tight or you'll have water cooled [or heated & melted grease] coming out the bottom. Cheers. ps, good point is no power valves to wear out etc--good bikes & great times.
