KTM Bull wrote:
Quote:
The problem I believe is that the coolant exits from the r/h front of the cylinder head and there is a large exhaust port blocking the coolant path around the l/h side of the head and this causes a hot spot around l/h exhaust valve which causes core shift and moves the inlet boss off centre and causes the valve to scrape on the valve seat and wear itself out faster
this is just my theory
I have some very simple and cheap ways to test this
Interesting and I can go with that, but how come so many do so many miles without this problem and by many I mean thousands, do they have a different head casting for different models?
Moto fathead is having both inlets done, guides, seat and valves. It seems to have been dusted before Chopper got it, the valve was worn we adjusted but it was on the way out and has continued to wear at a rapid rate, exhaust valves and clearnces are fine, which is a normal thing when dust has been involved
TB
