I recently did a 435 Thumper kit on a 91'DR, definatly pumped new life into it. A couple of "must do's". 1) Replace Airbox, the stock one is highly restrictive. The proper jets are included in the kit.
2) Replace header pipe and silencer, (FMF)
3) Update the suspension.
Note; the weak link is the kickstarter, with the added compression, you must be careful with the kickstarter,(broken cases & gears).
The thumper kit will breath new life into that Zuk, with out putting added strain on the valve train,(which the DR's dont hold up to) Good Luck
[This message has been edited by Shaw520 (edited 04-03-2001).]