Cdi have different oem numbers for 85 86 then 87 to 92. Just checked sgp numbers. So you will need another one.

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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock, DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.