Son bought home a crashed CB250R that his mate stacked. Has been sitting in the shed for 4 wks. Had a go at starting it yesterday, before replacing the forks etc. Have a spark, fuel in tank, clutch lever in, and recharged the battery. Just grinds away and grinds away on the starter. Removed air filter etc, Bumpstarting it doesnt work either. Any suggestions? Sidestand switch? clutch switch? plugs are clean, now, and were at the MFR gap (0.9mm) it has only 34,000 kms on it6, not worn out yet!