only altered mine a 1/4 in on the smoke screw, 1/4 turn on the diaphram, and 1/4 on the knurled adjuster under the diaphram, blanked the egr. makes quite a difference. did try a bit more but had to back off as it smoked on hard throttle. mark everything before you move it and you can always turn it back. been like it for a year or more now, no probs. iff you over do it you can cause the e.g.t to rise alot under hard throttle, ie smoke. alan.....
