Partzilla Live Q&A with John Talley – July 17, 2020
Partzilla live Q&A is back with John Talley and returning special guest Garrett Sifford answering more of your motorcycle and ATV repair questions.
Due to technical difficulties, this week’s live Q&A session stream was cut short, but Garrett and John managed to answer some Honda and Yamaha repair questions, among others, before the feed cut out. Check out 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
Valve Clearance Adjustments
I’ve heard different opinions about doing valve adjustments. Do you do it when the motor is hot, cold or warm and why?
John Talley: Well, you definitely want to do it when it’s cold because otherwise you’d be aiming for a temperature that’s going to be constantly changing. What I can tell you when they actually do the measurements that they base these on at the factory, I believe they have controlled addition of around 75 degrees, so if you really want to be deadly accurate, make sure your environment is around 75-80 degrees, but that’s the reason why. … if you try to do it warm, by the time you started the procedure, especially on a sports bike, it’s going to be a different temperature by the time you get to that last set of valves. So that would be why, you basically want it to be room temperature, and that’ll get you as accurate as possible by doing it that way.
I have a 2005 Honda Recon 250 that starts but doesn't stay running. I already replaced the carburetor and spark with OEM parts. Once it starts for a couple seconds, it doesn't want to start again. Any ideas?
Garrett Sifford: It kind of sounds to me like a really loose valve. First thing you probably want to do is check your valve clearance, and your intake and exhaust, and there could be a stopped up vent hose or the gas cap or one of the breather hoses on the side of the carburetor. … check your valve clearance and vacuum hoses, but it could just be a valve adjustment.
John Talley: Another thing you may want to take a look at is if there’s a small screen on the petcock. That could be gummed up as well. An ’05 isn’t really old but it’s old enough. Anything past a couple of months with the fuel …
Garrett Sifford: That’s all it takes. It turns into syrup.
I have a 2003 Grizzly 660 and the battery won’t stay charged. I can charge it overnight and ride all day, but then the next day it’s dead. Any thoughts?
Garrett Sifford: Well, you have two things to look at. The first thing I would check is the rectifier-regulator. Usually that’s what charges the battery up. Now, the stator creates an AC current and the regulator converts it to DC, which charges the battery. If that regulator is not working properly, it’s not sending the proper voltage to the battery, which would cause it to not charge properly, and you can run it because the stator is working … the only thing the battery is for is to turn the starter motor over and fire the injectors for it to start up. Once it does that, everything is run off of the stator at that point. So check your rectifier-regulator, and another thing that could be the problem is you could have a dead cell in the battery. A lot of times a battery will hold a charge for a bit, and then slowly drain over time.
Want to see more live repair questions answered? See all of John’s Live Q&A sessions here.