staggr500fb Posted March 16, 2015 Share Posted March 16, 2015 Hi guys, I have a yamaha ybr 125 injection. For the past month I have noticed petrol getting into my oil. I just cant find the cause of this. Need some opinions plz Link to comment Share on other sites More sharing options...
slice Posted March 16, 2015 Share Posted March 16, 2015 Check your compression, sounds like you have a worn barrel or piston rings, worst case is a hole in your piston. Just my opinion on the info you have given mind. Fuel usually runs down hill like most fluids so if you have petrol in your oil it has to be getting in from the top somewhere. It's also a good idea to do an INTRO in the new members section as most folks ignore those who don't do this. Link to comment Share on other sites More sharing options...
staggr500fb Posted March 16, 2015 Author Share Posted March 16, 2015 Okay thanks for that. If u dont mind me asking. What is the best way to check compression? Link to comment Share on other sites More sharing options...
slice Posted March 16, 2015 Share Posted March 16, 2015 Not at all mate, the best way is to get yourself a compression tester but they are pretty expensive if your only going to use it once, so ask around your mates or their dad's and see if they might have one you can borrow or you can go to a tool hire shop and get one for about £20 a day. As I say they are a lot of money to just use on occasion but you can be lucky and pick one up off of EBAY for just a few quid. Come back and say how you got on would you. Link to comment Share on other sites More sharing options...
KevtheRev Posted March 17, 2015 Share Posted March 17, 2015 Hold on , before you do anything , check the condition of your fuel petcock at the tank to make sure it's not leaking and check the carb floats / float needle and seat as if any of these arent working it will allow fuel to reach the engine while the bike's not running . Link to comment Share on other sites More sharing options...
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