G2 Ergonomics Dirt Bike Throttle Cam System - Hard Parts Review

G2 Ergonomics
Throttle Cam System

When I heard about the G2E Throttle Cam System (TCS), I was interested but not desperate to try it. Basically, the system consists of a billet-aluminum throttle tube and three "cam" ends that interchange by popping on and off easily. One cam is essentially the same as stock, one opens the throttle quicker initially and one opens the throttle slower initially. All three fully open the throttle in the same distance as stock.

I began with the fast-opening cam on a Yamaha YZ250F. It definitely made the bike feel like it hit harder and spooled up quicker exiting corners. It also accentuated any low-rpm hesitation the YZ might have had. I found it was critical to have the jetting and the fuel screw settings on the money, or the risk of a hiccup increased any time I whacked the throttle open. The stock-rate cam felt stock. I could not tell a difference. The slow-opening cam made the YZ250F insanely easy to ride in rutted turns and zero traction, but the arm-pump was instant on a track with jumps. I dug out the slower-opening cam almost immediately and started looking for a chance to install it in the YZ450F. The cam that G2E calls the Y 400 made a huge difference in ridability for the 450. The power felt softer, more linear and easier to control. The arm-pump that was an issue with the 250 was just the opposite with the 450. I can't think of one Japanese 450 that I wouldn't want the Y 400 cam on. The fast-opening Y 100 cam is fine for an aggressive rider on a 250F, especially on a fast or sandy track. For me, the Y 100 cam would be a tuning option, not a full-time accessory. As long as I have the YZ450F, the Y 400 cam will stay in it.

At $99.95, the kit is a bit steep, and as a tuning option, I see it being attractive mostly to fast guys on 250Fs, but I can't imagine a 450 rider who wants more control or one who rides off-road who wouldn't call it money well-spent. -Karel Kramer