Originally Posted by
AZTman
I know a while back there were pics of the long vs short needles. I didn't know there was a new long needle vs. old long needle as Grizz posted. Could we get anyone to post some images of the old/new long needle, intermediate, and short needles alongside a metric ruler/tape if possible? If you can't post images PM me and I'll post them for you. With this I think we could clear up some things for new GO owners that may have tuning issues. As stated before, STARTING WITH A CORRECT IDLE GAP IS KEY.
Travis
Originally Posted by
bigmatt
I have a question? how do you tell which generation go engine you have? I am interested in the different 7 and 5 ports.
OK Guys - have downloaded some photos for you.
Firstly the needles.
As you can see the Short LSN is quite bull nosed. It measures 1.44". The Long LSN is quite tapered and comes to a fine point. It is 1.6" long, so quite a difference. The intermediate needle which I don't have one of is more like the Long LSN but probably around 1.55" long at a guess, but you get the picture.
Gen 4 vs Gen 5.
Most of the changes are internal, but you can tell the difference by the cooling heads and the carb ends where the HSN screws in.
Gen 4 has a plain cooling head with GO and 21 inscribed. The end of the carb is all alloy coloured where the HSN screws in.
Gen 5 has more writing on the cooling head with Go Engine, Racing, and some other artwork on it. The end of the carb where the HSN screws in is black, with and alloy end cap, as opposed to the all alloy look of the Gen 4.
Hope that helps.