Partzilla Live Q&A with John Talley – July 9, 2021
John Talley brings you another weekly edition of Partzilla Live Q&A, answering your motorcycle and ATV repair questions.
Partzilla Live Q&A Highlights – Fuel Injection & Carburetor Issues
I have an 06 Suzuki GSXR 1000 and it’s jerky at low speeds and low RPMs. Any ideas?
John Talley: It sounds like you’ve got an issue with fuel delivery. My initial thoughts on this are that probably the fuel injectors need to be cleaned out. So you may want to take a peek at that, and we have videos that show how to use that Motion Pro tool where you just use regulator carburetor cleaner to spray through the injector. And it has a little battery in there that activates the solenoid inside of it so you can spray through and clean it up. That would be my first bet.
I have a problem with my Yamaha YFZ450 2006 quad. On idle, if I add gas the RPM jumps to mid-range and stays there for few seconds. I cleaned the carb, but no success. Any thoughts?
John Talley: I know the YFZ450 really well but the machine I’m so familiar with is the fuel injection model, which started in 2009. So I’m not super educated on the carburetor that’s on there, but typically when I had a carburetor that was a vacuum type slide, which I think yours may be, if that vacuum slide is worn down, it’ll actually hang up and it won’t bring the needle back down to bring your RPMs back down. So I would take a look at the slide on it, especially if it’s a vacuum type to see if that’s holding it up.
After cleaning the carb and jets on my 07 Honda 400EX, it now idles very high. I’ve adjusted the needle and checked the jets but I can’t figure out why it’s running so high. Any thoughts?
John Talley: Alright, well here’s an odd one. You may have all that set correctly but are you absolutely sure that you routed your throttle cable correctly and is it all the way down into the holder? Because I’ve put them back together where that cable got pulled up just a little bit and it was holding the main jet open a little bit. So make sure that it’s allowing it to close all the way. And make sure your idle screw hasn’t accidentally been turned in too far. But I’m sure you already looked at that so look at your cable and make sure that it’s not pulling that main jet or main needle up by accident.
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