My Gilera Runner 125 stops running after going perfectly for about 20 mins. No coughs or stutters, just cuts out, even when moving. It then starts no problem without having to wait. Runs for 2-3 minutes then cuts out again and does this repeatedly. starts no problem but only goes for 2-3 mins before cutting out again.

JCR, June 2010

some crap on here. the most common cause of this fault on the runners is the ht lead breaking and it pivots as the engine moves and arks out on the frame, rocker arms and crank bearings on the runners aarent a problem if the bike is maintained well,

m, June 2010

check your crankshaft and piston arms and bearing seals for any worn parts because i had a peugeot speedfight with the exact problem run for 2-5 min then just cutt out and as i went deeper in to the engine i was the crankshaft bearing that had gone because it depends on how many mile you have on the clock because they are only ment to last for about 6000 - 7000 miles on gilera runners.

adam smith bike and car mechanic, June 2010

ok its either a fuel or spark problem i would say.you need to do a few tests while its broken ,next time it cuts out make suremyou hyave a spark plug socket with you and take the plaug out and then popmit back into the cap and press the starter botton and see if it has a spark or not make sure you earth the plug on the head or similar metal part.i would aslo try and run the bike without the fuel cap on to seeif it causing a vaccum in the tank and not allowing the air to take the place of the fuel as its used.tell me does it cut out like its been turned off or does it fade away slowly.if it fades away it likeley to be fuel and if it cuts like it been turned off it more likley to be a spark problem.if its spark then its likley to be the stator coils primary ignition coil that is breaking down with heat or the secondary coil but not as likley to be honest.get back to me on it ok. adam

adam bike doctor, June 2010