My son has got a 2000 aprillia rs50.he took to the garage to put petrol in,and since then the bike will not start.it justs cranks over but will not fire up.

My bike cut out after a short time when the choke was released when warm. I changed the crank position sensor and did all relevant checks. took it to a Triumph dealer who took three weeks to repair the bike. They said that it turned out to be a perished carb' diaphragm which let the needle drop when as vacuum decreased when the revs dropped as the choke was returned.

Do you have fuel coming out of the fuel line?

Ride the bike 20 or so miles on open road. Stop and remove plug to inspect. 'Are they black or white ?


Black =rich white=lean

i had the same problem change your petrol filter. Then remove the air filter and the petrol hose to your carb. place a contianer under the hose and try to start if there is no fuel coming out then the only thing it could be is the fuel pump good luck

unscrew and lift the petrol tank and you will see the battery if it's the same as my sons 2005 you will need to losten the water bottle to remove the battery.

have a look inside the carb and clean it out, check spark plug and air filter,try changing the settings on the carb,if thers any modfications e.g a bore or after market air filter make sure the jet is the right size.hope this helps

First of all, a diagnostic wont tell them that there is arcing involved. I am thinking it is your crank sensor. It expands and retracts in different weather situations.It should make contact in all weather situations.

hello i know it might sound bizzar but thats happened to me before and in the end it turnt out to be that i needed a new spark plug