Been on ZXRworld and it advises that the L9 model from 1999 had some big engine improvements, but doesn't advise on whether these made any power or torque gains. I know the earlier l1 models had 65 hp... Does the L9 or even the the L5 come to that give better performace & if so how? Can't seem to find out

ok, zxr engine changes are a bit of a grey area, but this is how things stack up afaik..


early bikes (pre L3?) have cams with more duration and lift
some L imports have smaller carburettors, they look identical but the throat diameter is ~30.5mm compared to 32mm
inlet stubs (from head to carb) got a few mm longer from L3 onwards.. the later items being necessary if fitting ramair as they space the carbs away from a head a bit more and give more clearance for the box.
L9's have stronger conrods and crank, but this isnt really advantagious, as these were never a weakspot in the first place, and L9 version's are heavier, possibly a better base if you intend to lighten/balance them

and of course, only L's have the KBATL slipper clutch


H and L have different gear ratio's too, the H being more evenly spaced.

basically, if you are going to run the engine "as it comes" and on the road, i'd get an H (because of the gear ratio's), on track, an early L (with 32mm carbs) and if you are going to tune it... then it doesnt really matter what you start with.. as long as you have the 32mm carbs

Cheers Zimm.... so basically the later L models are no more powerful or user friendly than say my previous L1 model?

Hardly worthwhile Kawasaki making the changes then eh

they had to change something in 13 years ! lol ..

the engines got smoother ( a bit ) and stronger (imperceptibly)..