It might be your clutch gap. If the clutch gap isn't set properly, the clutch won't engage properly. That was my problem the first time I built the car.
The following instructions apply to the V-ONE RRR WC edition (Kit 31258B) [ see attachment ]
but I compared them to the V-ONE RRR Evo2 manual (Kit 31263) and the part numbers are the same for steps 44 and 45. Compare these instructions with your own. It would be best if you can find someone else that is running a RRR to help you out.
From the NitroKB.com archives:
Clutch gap is the amount the clutch shoe (step 42, part 133) moves before it touches the clutch bell (step 43, part 76). Clutch gap is measured with all clutch parts assembled EXCEPT the innermost ball bearing (step 43, part 178).
Be sure to adjust the clutch gap first so it is at 0.5mm (as per the left-side inset box) [ Edit: 0.3 mm in the Evo2 manual! Step 45, Step A diagram ]
; however, the instructions don't tell you how to do this. To adjust clutch gap, add shims as appropriate to the thrustbearing collar (step 43, part 143).
After you have adjusted the clutch gap, adjust the endplay. Use the Kyosho Shim Set (5x7) (Kyosho part #96643). ALL clutch parts should be assembled when measuring endplay. Add the washers onto the end of the crankshaft, right after the flywheel nut (step 42, part 137) and before the innermost ballbearing (step 43, part 178). Keep adding washers – a bit at a time – then reassemble the entire clutch assembly each time, and check how much the clutchbell moves along the crankshaft. Keep doing until the clutchbell moves only 0.1mm (just a hint of movement) on the crankshaft. After this, you should be done.
Glenn Cauley says it best, “You want to have only a very small amount of endplay; just a barely noticeable hint of movement (0.10mm) is good, but don't remove ALL endplay or the clutch will drag.” As per the Serpent 710 FAQ, when you spin the clutch bell facing up or facing down, it should spin for at least 5 seconds.
Special thanks goes out to Glenn Cauley, for reviewing and editing these instructions.