I've had the same problem for a long time and always thought it was because I wasn't going fast enough or something. I checked the manual this morning and it says 30 mph and 3rd gear or higher. No effing way!, lol, So I played with it on the way to work this morning and found the culprit. It's our very sensitive clutch levers. Even 1 mm of travel will disengage the cruise control or prevent it from engaging. The secret is to take your fingers completely off the clutch when you want to engage the cruise. Once I did that, it would engage every time even at 30 mph in 3rd gear. Hope this helps.