1997 Yamaha VMAX 600 PLEASE HELP!!!
First off, thank you for taking the time to read my post here. I recently purchased a 1997 Yamaha Vmax 600, it has around 2,000 miles. Last year I rode the sled and noticed that it was a gas hog compared to my friends sled (the exact same sled, same year and all). I burned almost an entire tank while he only used less than 1/4 of a tank. We rode approximately 15 miles. We only had a chance to ride once last year due to the lack of snow.
About a month and a half ago, before the snow started to fly- I called my local small engine repair shop to get it in for service. I advised that I was having a fuel consumption issue last season. He cleaned the carbs, new plugs, ect.
I finally got to ride about 2 weeks ago when we got dumped on with a snow-storm. I was having the same fuel consumption issue. I called another shop, because my mechanic was out of town. I took the carbs off my sled and he took them in to fix them. (He did the following to my carbs: Cleaned them, the sync was off, floats were set at 21mm and should be set at 24 mm, fuel screws should be at 1 1/4 turn, carbs were very dirty, soaked jets.)
I had the carbs put back on my sled and took it back out- again, I was still having the same issue. I go about 10 miles and burn 9-10 gallons of fuel. I say its burning it because the engine makes a sound like its bogged down, almost like a popping noise- but not a backfire). The sleds is very slugglish at low speeds but takes off and runs excellent at speeds over 50.
I took it back to my mechanic when he got back from vacation. Since then he had done the following:
New Plug Wires
Several New Plugs as they appear to be fouled out (very dark, almost black, sometimes one much darker than the other).
Compression Test (75 at warm)
Check the exhaust for leaks
Something in the carbs? pins or something?
New Fuel Pump
Something to do with the part that mixes the fuel and oil
checked the choke cable
What should I do we are all stumped....... I am to the point where I just want to ditch it but not its just the point that I can figure out what the problem is....