Honda Unicorn
Missing all times while riding

Sir,

I took a honda unicorn a week ago (on 30/12) from the first movement its showing missing while riding it does not showing pickup of

a 150cc bike. it shows large miissing when the engine is idle for 2 hours. I go to service centre they are saying that its will gone on first service

i dont think so because my friend took same vechicle and it does not showing any complaint... please help me...