if you want an hw80 to run nicely ask dave hall there was a review not long back about a hw80 f.a.c he tuned think sfs tuned it got it to 16ftlbs dave have it at 19ftlbs and running alot smoother a v mach kit to by is £80 dave will button your piston and put a kit in for around the £100 mark. his works is the best ive seen

Atvb rob