Andy19771

I know this is an old thread but I’m running out of options. Hopefully I get a response. Bought a 1980 NF75. Runs amazing when cold but as soon as it warms up it’s won’t rev and clangs whenever I try to rev it. Checked the Carb, tried a smaller and larger jet but it’s just not working. I have noticed the previous owner has used silicone between the head and crank case so assume this could be causing me the issue. However there’s no info out there and gasket kits are only listed till 1979