Partzilla Live Q&A with John Talley – July 30, 2021

John Talley brings you another weekly edition of Partzilla Live Q&A, answering your motorcycle and ATV repair questions.

Yamaha ATV repair was a popular subject in our latest live session. 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 with John Talley 07-30-21

Partzilla Live Q&A Highlights – Yamaha ATV Repair

Yamaha ATV Electrical Problems

I have a 01 Yamaha Raptor 660R. I have everything plugged in but I don't have spark. What can it be?

John Talley: Alright, you’re saying you have everything plugged in. It sounds like you’ve done some work on it, so go back and recheck everything. … Start with the simplest thing first. Make sure your battery is good to go, then go to your fuses and check that ground in particular to make sure it’s grounded properly. And then you need to start eliminating possibilities. Probably wouldn’t hurt to open up the service manual and look at your diagrams and start checking your wires for your ignition and your starter. Then go back and check your starter solenoid. We’ve got a bunch of different videos where I go through that exact scenario, and you just need to apply the technique to your particular machine. I think we went through a no-start scenario on, not a Raptor but on a YFZ450R, and I also did a no-start on a Grizzly 700. That would probably be the closest to the colors and the diagnostics to a Raptor 660

I have a YFZ450 and I already installed a regulator-rectifier and a stator but my battery drains after a couple of hours. Any thoughts?

John Talley: Well, if you’ve already done A and B, then it’s probably going to be C. What is C? That’s going to be your wiring harness, so you need to go with an ohm meter and check from point to point and make sure that it hasn’t suffered a break somewhere in there … and I’m betting it’s going to be the harness. 

Yamaha ATV Cooling System

I was wondering if I flush the radiator out on my YFZ450, can I run the bike with the water in to really flush it out?

John Talley: Well, I did a flush video on a KLR 650, and it details how not just to drain it and refill it, but I used a radiator flush solution. I can’t remember the manufacturer for that but I go through the whole process of how to dilute it, run it, empty it out and then flush it out with water a couple more times and then refill it with radiator fluid. So if you would, check the video for the KLR 650, which I did maybe two or three years ago. 

Yamaha ATV Engine Problems

I have a Yamaha Banshee that only works with one cylinder. Any thoughts?

John Talley: Well, it sounds like you need to do a compression test to see what you’ve got and see if this is going to be a mechanical failure or an electronic and/or fuel failure. Process of elimination. Get out there and do some leg work, but I would start with a compression test, and then check your ignition just by pulling out your spark plug, putting the plug into the cap and seeing if there’s a spark or not. 

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

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