Having read a lot of private ‘for sale’ adverts many of them mention “No test pilots” “Full-payment before any test rides”, etc. Some seem outwardly aggressive about the fact, I understand the seller’s reasoning but I don’t like the idea of handing over a stack of cash before making the decision to purchase as the bike could be a dog, overpriced or just wrong. So, what if it becomes too difficult to do a decent test ride? Are there any definitive ways to check over engine and gearbox workings without riding? Or any tips on spotting mechanical mistreatment other than missed service/visible damage/leaks/etc?