Partzilla Live Q&A with John Talley – October 01, 2021
Another Partzilla Live Q&A session is in the books, with John Talley answering your motorcycle and ATV repair questions every Friday afternoon.
Yamaha ATV repair questions were abound in this week’s 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 Highlights – Yamaha ATV Repair
I have a Yamaha Grizzly and the starter keeps blowing the 30 amp fuse. I replaced the starter relay and still have a problem. Any ideas?
John Talley: That’s going to be one of two things. Either A., you’ve got a direct short on your battery cabling or your cable going to the starter, or it’s the starter itself. That would be my bet, that it’s going to be the starter. You can try doing a quick jump, but be careful if you do that across the solenoid. Because if it’s truly the starter and she’s completely locked up, I’ve seen screwdrivers get welded in between those two points. And they wouldn’t want to let go, and then you’re talking about a Chernobyl type of meltdown at that point.
My 05 Yamaha YFZ gets pressure in the coolant reservoir tank. Any idea why?
John Talley: More than likely, you’ve got a head gasket that is failing and it’s pressurizing your cooling system. That’s exactly what’s happening. I’m sure that’s not what you wanted to hear, but yeah, it’s about to let go. When or if you do a rebuild on this, make sure that you don’t just throw another gasket in there because more than likely, it needs to have both the cylinder and the head resurfaced ever so slightly just to make sure they’re flat.
I've got a 2006 YFZ450 that bogs when I give it throttle. It doesn't like to go half throttle, only no throttle or all throttle. Any thoughts?
John Talley: So you’re saying that on the midsection it’s just sitting there bogging down. If this is a 2006, I think that’s going to be carbureted, so when we were talking earlier about jets, go in there and take a peek because if it’s like [the machine] behind me, it’s probably what they call the slow jet and that’s the one that’s most active when you’ve got just a constant throttle. I wonder if that one’s stopped up, because it is a fairly small jet. When you’re looking at the base of it, you’ll have I believe the pilot furthest down, the slow over to the right and of course your main is going to be dead center. Well go ahead and pull all three of them, and you should be able to look through them and see if they’re stopped up or not. And when you do that, also make sure you spray down into the jet and make sure that port isn’t stopped up. I’ve seen that happen before as well.
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