Partzilla Live Q&A with John Talley – April 22, 2022

John Talley is back for another edition of Partzilla Live Q&A, answering your motorcycle and ATV repair questions.

Fuel and air problems came up a few times during this edition. Check out some excerpts from Partzilla’s latest live Q&A session below, and tune into our YouTube and Facebook channels every Friday at 3pm Eastern for the next edition. 

Partzilla Live Q&A 04-22-22

Partzilla Live Q&A Highlights – Fuel & Air Problems

I’m having problems tuning in a Yamaha Banshee after porting. Running stock carbs, I just can't get the off idle response where it should be. Seems like a needle adjustment, but I already tried all the slots. Any thoughts?

John Talley: If you’ve already gone through all of the adjustments on the needle itself, you’re going to change needles, especially when you start messing with ports. I’ve actually gotten old two strokes in trouble. If you go a little too far on the ports, it can really throw out the dynamics, because basically it’s intake and exhaust, depending on where the ports are. If you start adjusting them too far down, then it’s really not bringing in enough fuel as it is with the air to get the right ratio. So it sounds like you need to go down a size on your needle, if I’m correct, to let some more fuel in there if it’s stumbling like that. 

For a 2008 Yamaha V-Star 650 gas tank's tachometer holding screws, how are the nuts installed so they don't spin when turning the screws?

John Talley: Alright, that’s stretching my memory a little bit, but I think the threads on those were brass. And they’re actually in rubber, and you push it in there and when you tighten it down, it pulls up on the rubber and that acts like a rivet to bring it up. Usually we would just push down on them when we were assembling these things and it would catch. If you’re having trouble removing it, that may be a different story. Because I have seen those, especially on bikes that are subject to high moisture areas, they would get corrosion down in there and we’d end up having to drill out the screw, which is stainless I believe, and then remove it that way. But if memory serves, it’s basically a plastic rivet or a plug with threads in it, and then it pulls and expands out the rubber and that’s what holds it in place. 

What’s your best guess for what causes low fuel pressure? Fuel pump, fuel filter or something else?

John Talley: Most of the time it’s going to be fuel-pump related. The fuel filter? Yeah, sometimes, but nine times out of 10 it’s going to be the fuel pump itself that’s starting to lose a little bit of zip. But hey, fuel filters are a lot cheaper than a fuel pump, and if your fuel pump has that much time and mileage on it, go ahead and do the filter first and then go after the pump, unless it’s an integrated unit. 

I have a 2016 Goldwing with 53K miles and I’m starting to hear a ticking on the left side around the head. Is it the valves or the fuel injectors?

John Talley: I’m thinking valves on this one. You’re really not going to hear injectors tick, because that solenoid is so small inside of the injectors. So it’s going to be valves.

Want to see more live repair questions answered? See all of Partzilla’s past Live Q&A sessions here.  



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