So this is my beautiful fuel pump cousing stalling, backfire, low bike power, lean fuel and other bad things you never want to have in your lovely bike. Patient is KTM 690 SMC from 2009. I was curious why this expensive pump worked bad. All pieces together:
Inside is just an electric motor and small pumping section:
Pumping section:
All pieces:
So where was problem? My investigation results tells that is caused by that bearing:
Just see that clearance:
So... that clearance causing attrition of the pump rotor against to housing. So we can see big clearance between them where the pressure escapes.
I was very tired of looking why my bike is working very bad. I cleaned fuel injector, checked voltages on the throttle, checked with tuneecu for some errors, checked intake boot but without results. It was just broken fuel pump.
Other question is it worth over 400$ for oem part.
Great post keep up the good work also if you want you can follow me and comment on my post so that you can receive more up votes from me.
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$400 for a tiny pump. That’s insane. Hopefully you can find a cheaper aftermarket one. I mainly work on my Diesel trucks and when something breaks that means it’s time to upgrade 😉
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Actually I ride on aftermarket fuel pump worth 50$ and it worked excellent 3000 km and still is working. There are opinions that we could use pump from yamaha t-max.
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I’m always happy with a cheaper alternative that performs just as good as them expensive OEM parts.
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please follow me & up vote me i will follow you & up vote you any time thanks
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