Hound Dog 400 followed me home! What year was it made?

[Lizardking]

Just picked up this little jem and want to know if any one knows what year it was made. I'm going keep it as is for now but want to find the correct engine. I've been researching but not much info on the 400. From what I've read here the 400 came with the hs40. Age... what is it?

 

[SimpleTom]

Early 70s. Hard to say exactly without the original engine.

 

[Lizardking]

Early 70s. Hard to say exactly without the original engine.

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The previous owner Didn't know the year it was made and that he had it for over 30 yrs. Unfortunately he didn't keep the original engine after replacing it with the new Honda 5hp. His dad own a lawn mower business and from the many bikes that went through the shop they keeped the 400. Hopefully somebody can narrow it down since I read somewhere they started making the dogs since late 60's.

 

[Lizardking]

So I've been told to use an early 70's hs40 Tec which I have that came from an Arco. I was also told to use a pre 70's metal tank Tec. I will keep on digging for info and hopefully somebody has the correct answer.