Question about 2003 Aprilia Atlantic 500
If you are getting fuel in the oil it can only be coming from one place. The float needle valve in the carburator is sticking open causing fuel to flow from the carburator into the combustion chamber, past the rings and into the oil. The only fix is to remove the carburator, remove the float bowl and the float. Remove the needle valve and clean the needle seat. Inspect the needle valve tip to see of it is damaged in any way. Remember while you are inspecting the needle seat that the smallest of particles can cause your problem.
Posted on Nov 19, 2009
Two things cause gas in oil problems on this fuel injected bike:
Overfilling the gas tank will cause gas to overflow the evaporative canister and spill into the crankcase.
Poor design of the cooling system as regards the placement of the radiator and fuel tank can cause the gasoline to overboil into the evaporative system and spill into the crankcase.
Either situation can lead to oil pump failure and total engine loss.
Check with Aprilia customer service for technical bullitens regarding the re-routing of the evaporative lines and new thermostat specifications to help minimise the likelyhood of this happening.
Posted on May 01, 2011
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Posted on Jan 02, 2017
SOURCE: Gas in oil
Does your bike have a fuel shut off or a vacuum pump? It sounds like the carb, throttle is leaking fuel with the bike off and it is running into the oil. Could be an explosive situation.Check out the fuel pump, make sure it is not running, or the shut off, make sure it is shutting off. Hope this helps.
Posted on Aug 03, 2010
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