I recently bought a reasonable condition '02 315R to ease me back into trials after a very long time away. The bike generally runs OK, however, several times now it has faded away quite rapidly at higher revs. It's most noticeable while roading it in fifth. It rides OK for about half a mile and then the power just falls away and it cuts out - as though you'd run out of fuel. It will then start immediately and will run a little rougher than usual and either do the same thing or get over it. Any hints on what I should look for? Many thanks

poss clogged fuel filter blocked tank cap not breathing

possibly blocked filter on side of carb or float height is to low and you are running the carb dry (by the time you've started it again its filled up)

http://montesacota315.com/en/

Thank you both, I will investigate the filter and the carb settings.

hello

I had same problem with mine run like champ all day using it as trials machine ,road use or trail (green laning) it had symptons of fuel starvation after 10 mins or so of top gear fixed throttle riding tried everything to fix carb/ign/fuel delivery/ turned out believe or not to be exhaust needed a decoke worth a try