Iron Man Tiger Seven was a Japanese tokusatsu series that aired from October 6, 1973 to March 30, 1974 with a total of 26 episodes. It’s pretty much trying to be Kamen Rider without being Kamen Rider and has a hero born of tragedy, as several Mu monsters — yes, the same Mu that sung under the ocean and is also the home of the KLF — attack a dig that our hero’s human alter ego — Takigawa Go — is part of with his father, who is leading it. He’s stabbed in the heart and his father gives him an ancient heart that he has found in the ruins and a magic pendant that activates his powers when he says, “Tiger Spark.”
I say tragic because moments later, everyone but Takigawa Go gets killed and then a few episodes later, his girlfriend gets killed to, giving him the trademark scarf he wears when in Iron Man Tiger Seven mode.
Then again, he does get a somewhat intelligent motorcycle with rocket boosters and transformative powers that comes to his aid when he roars.
The bad guys in this are astounding with each monster of the week being called “something” Genjin, so we have Kappa Genjin, Merman Genjin, Flying Dragon Genjin, Rat Genjin and the incredible Wolf Genjin, who is a white wolf riding a motorcycle.
The same company that made this also created Kaiketsu Lion Maru, which has three kids in the samurai era who can transform into a human/lion hybrid.
You can watch the first episode on YouTube. There are also episodes with English subtitles on the Internet Archive.