joseph baz replied:

Brett few years ago I fitted extractors to a HJ75 troopie and i was never convinced about performance increase,unlike the petrol engines,and the vehicle become noisier on long trips can be a bit annoying
RGS Joe

phil replied:

Hi Brett
I have the same model 4wd. I was told that extactors would improve performance/economy. Economy was not improved but the down low performance was to a small degree, wether it was worth the cost [$ 280} who knows? Hope it helps!PHIL

Brett replied:

Thanks Phil,

I ended up spending a bit more and put recon injectors in the engine and had the timing checked and a rocker adjust.

The original injectors were not to bad, the timing was out by 6 degrees and the rockers adjusted and now it is as if I am driving a rocket.

Thanks for the info on the extractors.