How do you modify a 85 Yamaha yfm200 moto 4 with suspension?

To modify the suspension on an '85 Yamaha YFM200 Moto 4, you can start by replacing the stock shocks with aftermarket options designed for enhanced performance and adjustability. Upgrading to high-performance shocks will improve handling and comfort on rough terrain. Additionally, you may consider adjusting the preload settings to suit your weight and riding style. Finally, inspect and possibly upgrade the front forks to ensure balanced handling and improved stability.