Derbi—The Red Power: The Silver Bike Top End
Posted: Sun May 19, 2019 10:39 pm
Most of the recent effort has been put towards the PMPR, the Malossi bike, and the Cobra, but the Silver bike hasn’t been forgotten. There was a small window of time to check out the head on it. Since the head on the PMRP failed it was logical to surmise that the one on the Silver bike could be suffering from the same problem. This was based on the two bikes behaving in a very similar fashion, and the compression tests showed them both to be at around 75psi. Well all that information was fine, but it turns out that the Silver bike must have another issue causing its circumstances.
Prepping the head for removal.
With the head off it was clear to see that it looks brand new. No damage like found on the PMPR head, and the o-rings were in perfect order as well. There is some slight scoring on the cylinder wall, but not really enough to keep it from turning over. Still they really should have put the o-rings on the cylinder like other kits such as the Airsal, Derbi, and Metrakit top ends.