YBR 250 TECHNICAL PROBLEMS?

08 Yamaha YBR250 discussion forum:


YBR 250 TECHNICAL PROBLEMS?

YBR 250 TECHNICAL PROBLEMS? 
CHRISTOS said 2008-08-20 11:08 
 
I own a YBR250 3-4 months and from the first ride I heard a nocking noise coming from the engine while it was running at 3500 RPM and over.
I still haven´t got any serious answer regarding this anoying noise.
All the mechanics say different things, like :
Let the bike run 6000 km when the piston will take its form.
This bike makes this sound which is normal.
Yamaha lets a gap between piston and cylinder bigger that the usual to avoid overheating.
........ and many others.
The problem still remains the same and always while the bike is running or accelerating. Never having the N in the gearbox.
Anyone who has axperience on that? 
 
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