17-10-19, 11:38 AM
One reason for damage to nikasil bores on number 3 is that grit found its way in when changing the plugs.
Since 3 is the one that holds the greatest amount of junk especially on bikes left on the side stand in bad weather and drain hole blocking.Add grit and bore washing you now have an unlubricated bore ready to be worn more than normal.This is just a theory
There have been a few cars with Nikasil problems The most notable early XK8 Jag V8 and the early BMW V8 engine, but this was finally traced to high sulfur cheap fuel.
The sulfur reacted with the Nikasil de lining the bores.
most fuels not have low sulfur virtually eliminating the problem.
I have my serow stripped at the moment to replace a leaking base gasket, it has 35000 km on its air cooled engine and the nikasil bore still has the original honing marks with absolutely no determinable wear.My last serow had enough bore wear at the same mileage to cause its oil burning issue, cured by a rebore and oversized piston and rings,
Since 3 is the one that holds the greatest amount of junk especially on bikes left on the side stand in bad weather and drain hole blocking.Add grit and bore washing you now have an unlubricated bore ready to be worn more than normal.This is just a theory
There have been a few cars with Nikasil problems The most notable early XK8 Jag V8 and the early BMW V8 engine, but this was finally traced to high sulfur cheap fuel.
The sulfur reacted with the Nikasil de lining the bores.
most fuels not have low sulfur virtually eliminating the problem.
I have my serow stripped at the moment to replace a leaking base gasket, it has 35000 km on its air cooled engine and the nikasil bore still has the original honing marks with absolutely no determinable wear.My last serow had enough bore wear at the same mileage to cause its oil burning issue, cured by a rebore and oversized piston and rings,