For what it's worth, back when I had my 700sx I ordered a 51/43 helix from Hauck. When I received it it had a letter D stamped on it. I also have a Hauck helix with a letter G-1 stamped on it this came with a #4 clutch kit for a 700 srx. I thought I had seen some guys on here say the G1 was a straight 49. Who knows.As far as lake racing that G1 does work well with the stock weights or the 89a10 weights ( which also came with the #4 kit).With the 89a10's I have to run a silver sec. spring though or it will shift up way too fast.