Question about 2007 Yamaha Ybr 125
I have 50cc Yamaha neos scooter, it not powerful enough as i need to travel to work on A roads which speed limit is minimum 40 mph. So i have purchased non runner Yamaha YBR 125 which been standing for two years. I have experience fixing bikes with carb, but I never had something with fuel injection system. After I got it in my yard I have took it apart cleaned tank, all hoses, filter, fuel injector,changed oil and it didnt start so I started narrowing down the problem, it creates the spark so I have looked in fuel feeding and noticed there is no fuel coming from tank to ejector. I took out fuel pump and connected to power and tried to start bike and once I turned ignition on it makes click noise and once I trying to star its not doing anything and gets a bit hot, can it be blocked? also I put some fuel inside fuel line from tank to injector and tried to start it just to see if fuel injector will work, but its not taking fuel in is that because the pump generates pressure or it could be blocked to? Thank you
Hi sounds like your nearly there ,try swapping hose around ,I once mixed the in and out ,next did you take the carbs apart and clean ,also a small shot of wd 40 in to the fuel pump without hose connected then pour out ,from what I read sound pretty good kid best of luck
Posted on Jun 07, 2014
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Posted on Jan 02, 2017
SOURCE: bike only fires once
Okay, let's have a look at it. Say Ahaaa.
The probable cause of the problem is not the spark. Get a fresh set of Stock NGK spark plugs, ground the plus to the engine, and check each cylinder for spark as the starter button is pressed for 3 seconds or so. I will wager that the spark is present.
The likely problem is the fresh gas was put into a very rusty gas tank. Bits of rust now inhabit your carb and are having fun plugging up the carb. Look at the gas valve. With a little luck there is a small bowl behind the valve. Remove it and tell me what you see in the bowl.
Posted on Apr 11, 2009
Sounds like the plugs are fouled out, I would pull them and make sure they're about the color of a paper bag. If they're all sooty and wet you most likely have a rich condition. I would take the carbs out and clean everything and pop in a new set of plugs. I have a 87 Fz600 that was acting up until I cleaned the carbs.
Posted on Apr 20, 2009
not that familiar w/Yamaha,but disconnected vacuum hoses may connect to fuel petcock at tank.I know Honda uses a system that only allows fuel to flow when vacuum is supplied.
Posted on Sep 26, 2009
hi, the problem is that your bike is running to rich( to much fuel from carb to engine) so its the un-burned fuel mix that your seeing on your plug and thats fouling it out......now this is caused by either to rich of fuel mixture(you should be mixing 32:1) or you need to rejet carb so it delivers less fuel to engine... your carb has a jet in it and the # is stamped on it ( if you take the carb off and remove the bowl( 4 screws) you will see it,it will have an octagon shaped head.) for example if the # on it is 55 then you need to go with a 53 or 54...... also a good sign you need to rejet with a smaller jet is your bike will spooge(leak) a black oily residue from exhaust pipe and muffler( same residue thats fouling the spark plug.)
Posted on Sep 27, 2010
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