ricardopelc

Depending then on the size of the pulley cogged instead of smooth belt would be logical then better grab wrap around!

Could the centrifugal clutch pulley be suspect here not engaging properly thus causing belts to overheat... the clutch pulley it does get extremely hot smoking hot or is it the other way round belt transferring energy to pulley! Explore all possibilities until the truth is known!

Do you have a contact for the person you sold the Negri to so we can share knowledge as we both have the same chipper!

Thanks for that, the belts on there are cogged type not the standard classic v type they seem pretty new but seem to be rubbing melting around the edges on the top pulley. Purchased the negri r250 recently practically really good condition been sat in a shed for years have greased the bearings just for good measure and chips/mulch's really good couldn't fault it has anti stress as well, limited to 90mm dia but anything over goes in woodburner, it seems really good build quality for an italian make and decent honda engine. Just wondering to swap from cogged to standard belt and had noticed on this one the tensioner sits on the inside of the belts surely this is wrong as the the cogged side is hitting the tensioner and causing friction! doubt that the top clutch pulley is suspect causing the belt to overheat! your thoughts..

May i ask where you purchased the belts from and technique for putting them on as they don't have a release tensioner. Are you still using the negri chipper!