if your just oval racing or TT with no jumps or harsh bumps... you can swap out teh stock shock for a shorter shock and weld a new shock mount onto the swinger... thats how i built mine... it uses a YSR50 rear shock.. i still have 5/8" travel in teh back also.... i got this tip from the 98-99 ama flattrack championship winner... (he owns the yamaha dealer close to my house) and he ran a 87 banshee so after he retired from racing i hit him up for tips....