I used to have a Suzuki PE 250. It was the last year they made them, 1982 maybe. IIRC they tossed the RM250 motors in them to send off or something to the affect. Thing went like a raped ape for it's time. Anyhow going full speed, full on lunatic. The chain broke, wrapped around the front sprocket eventually breaking the engine case. Reminds me of your Dodge. Good luck Tom!