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I think I have found my problem. I re-wired the charging system with the information found in the "how to" section. It did not help. I am still getting around 12.3-12.5 volts at idle with the fan on. This is when it starts missing. The stator and the battery seem to be okay, but I am...

Now that you mention it, I think it does get worse when the fan kicks on. I will check that. Thanks!

Did the shotgun. The idle mixture screws on all four cylinders make a difference when I turn them now. I also found a missing o-ring on the #1 cylinder vacuum diaphragm. I guess the dealer that rebuilt the carbs a couple years ago left it off. The bike hadn't been ridden since the rebuild...

The left rear cylinder, number 1 I think, seems to be dead at idle. When I pull the plug wire, there is no change. I checked and re-gapped all plugs. I made sure each plug was firing. Also, when I turn the mixture screw all the way in, there is no change. All other cylinders cause a change...

Put in about 100 miles yesterday afternoon. I am very happy with the Shinko's in the OEM sizes. I don't believe the 170 rear would have fit without the washer swap and I didn't want the tire offset. There is only about 1/4" clearance with the 150. The bike handles much better. I can't really...

Tires are on. Haven't ridden much due to storms. Just down the road a couple miles between the heavy rains they feel great. Hopefully, riding this afternoon. I'll let you know more. Going crazy to get on the road!

Well it looks like I found a local guy to get the tires from. Shinko 230's in OEM size mounted and balanced for $210. I take the wheels off and carry to him. I am getting them tomorrow. Thanks for all the input!

$144.98 includes the front and rear. Rear is $82.99. Front is $61.99.

Thank you for the information. That spreadsheet is where I got some of my information along with reading posts. I just found the Shinko 230's in OEM sizes for $144.98 with free shipping. Do you think I would be unhappy with the Shinko front tire? I'm thinking for that price it may be worth...

Sounds a lot like my riding style and the feel I was getting from the Qualifiers, but I thought maybe they were just that way because of the dry rot. I think I am going to give the Shinko's a try in the stock sizes. It seems the stock sizes are better for "all-around" riding with all stock...

My original plan was to go back with the OEM Dunlop Qualifiers. Maybe I should stick to that! I am trying to balance price and function as there are a few other things I need/want to do to the bike. I got a smokin' deal on the bike, but don't want to go overboard. I don't ride as...

I agree. I don't seem to have that problem, but only hit 125 twice in quick bursts. More rotating mass robs power as well. Do you run a larger rear tire?

I glanced at it, but the Shinkos get such good reviews. What's you opinion of them?

Also, would you suggest the 120/90-18 front tire if I upgrade the rear to a 170?

Just made a better measurement. I have 3/16" between the tire and LH swing arm. Sorry, I originally posted as three eighths.

I have searched and read, but I still need advice. I am going to have to put tires on the '86 Vmax I rescued. It has been sitting up for about 6 years and the dry rot is showing up strong after a little riding. It currently has the Dunlop K525/F20 tires in the stock sizes. I am pretty sure I...

Update. I did get some debris out of the exhaust, but not a lot. I went ahead with the five hole mod and now everything seems fine. I have ridden over 200 miles since this with no more problems! Thanks for all the replies.

Thanks for all the replies. The carbs were rebuilt and the fuel tank replaced about three years ago. They were hoping to ride again. Overall, the bike sat for about 5-6 years other than that. I did change the air filter and the oil and filter. The carb plugs were out and the screws were...

Sounds like you guys have about the same thoughts I have on the exhaust. I guess I am going to mod it some way even though I would prefer to leave it stock. I am one of the few that likes it quiet! Is it normal for the Vmax to be cold natured? Once it reahes operating temperature it runs...

I just purchased a 1986 Yamaha Vmax all original with 13,500 miles. I had to rebuild the clutch slave and master cylinders before I could ride. There was a mouse nest under the seat and I noticed something coming out of the exhaust that looks like dog food. When I first got it running, it seemed...