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Old 02-25-2010, 09:21 AM   #1 (permalink)
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1999 Yamaha Vmax 600 - too much oil used

My 1999 Yamaha Vmax 600 always uses much more oil than the arctic cats I ride with. As an example, riding as a group this weekend we went about 50 miles. at the end of the ride the cats needed maybe an ounce of oil, where my Vmax needed maybe 10 ounces.

I know there is suppose to be an adjustment nut that I can adjust, lining up some lines with a mark, but I can't find it!

Can someone point me to it? Give a picture of it maybe?
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Old 02-25-2010, 08:31 PM   #2 (permalink)
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Mine chugs oil also. Follow the oil pump line to the throttle cable. There is a nut you can loosen and let some tension off the line then tighten nut again. Be careful not to restrict the oil too much.
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Old 02-25-2010, 09:40 PM   #3 (permalink)
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before you mess with the cable adjustment, how many gallons of fuel did you use in your ride? use that comparison to compute a gas/oil ratio. no way the ac's only used 3oz in the same trip, unless your riding with fuel injected sleds cats , which is a whole different delivery than carbed sleds. heres the math example: 50 miles, around 5 gal fuel, depending on terrain and riding style. 128 oz per gallon x 5 = 640 oz fuel. 10 oz oil(if that was an accurate measure)640/10= 64:1 ratio. factory setting shoots for around 50:1. i would say if your numbers are correct, you are adjusted on the lean side of the oil spectrum. price a quart of oil, then price out a piston and cylinder and all else involved, ride your sled and call bs on the cat riders, or tow them back.
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Old 02-26-2010, 06:28 AM   #4 (permalink)
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The arctic cats are ridden by my wife and daugher. We get home and I put the oil in and get them ready for the next ride, so yes, mine uses about 10 oz to their 1 oz.
We ride as a group, all at the same speed, and no gunning it. The cats are the same age (1999 and 2001) and carbed, not fuel injected.
We all used about 5 gallons of fuel.

From the oil resevoir there appear to be two oil lines coming out, but then I lose them under the engine. I don't know where the oil pump is. Is it at the front of the engine, behind it (under the carbs?) belt side? exaust side? Do I need to take something off to find it?
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Old 02-26-2010, 07:02 AM   #5 (permalink)
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the oil pump is below the carbs, more so to the right(mag side). follow the cable down and you will see it. best access is gained with carb and airbox removed, but they are a pain to deal with with the engine in. there are alignment marks on the pump and the pump arm, if you want to double check the setting. i can dig up the procedure if you need it. i would be a little concerned about the lack of oil the cats are using if your info is correct. does your sled seem to smoke excessively and do the plugs appear oil rich?
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Old 02-26-2010, 07:59 AM   #6 (permalink)
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Get a repair manual for the vmax. It will walk you right through the adjustment and many others you may have to make. You may be able to find one online for free in pdf form
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Old 02-26-2010, 08:10 AM   #7 (permalink)
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If it is a twin the oil pump is mounted to the water pump (mag side).. I use about 3 quarts of oil to a tank of gas (10 gallons) currently in my 97 XT... I need to adjust mine since i have a wonderful cloud of blue going down the trail.. It was set that way since the dealer that rebuilt it 3 times didnt figure out the oil pump was junk till the 3rd time and never adjusted the cable back.. So now that i am the owner of it i get the joy of fixing it... And incase anyone is wondering yes i do foul plugs not as bad as youd think but still not great. BUt the sled was on the trail and that was all that mattered since my others were broken. Now that i have the motor out im more inclined to adjust it..
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Old 02-26-2010, 01:09 PM   #8 (permalink)
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I have the "Owner's Manual", which has a nice closeup picture of the locknut and adjuster. But the closup shot does nothing to help with the location.
I'll poke around under the carbs as you guys have indicated to see if I can find it.
At this point, I'm just hoping to ensure that the adjustment mark lines up properly.

I do seem to smoke more than others out there. and I'm no good at reading plugs, so I can't offer much on that.

Ok. Friday at 2pm my time. Gotta leave work and go ride. Thanks for all your guidance.
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Old 02-26-2010, 06:29 PM   #9 (permalink)
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As long as it works, keep feeding it!
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Old 03-04-2010, 07:24 AM   #10 (permalink)
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I have exactly the same problem. Though I have 2 VMAX both are adjusted the same per the handbook. One needs twice as much oil as the other. 100 mile 2 quart vs. 100 miles 1 quart.

Has anybody fixed this issue on his VMAX ???
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Old 03-04-2010, 11:23 PM   #11 (permalink)
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Dont think so. I know the once the oil pump begins to wear out oil consumptions will increase with these. Also does your engine have the updated oil pump?? I have a buddy who used to race these things and he had a 97 Vmax 600 that he used on the trail. He was sent an "updated" oil pump and decreased his oil consumption considerably.
Just something to look into. Since the two that i have that are set right burn about a quart to a tank, and my modded motor burns 3quarts plus.... It isnt set right though..
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Old 03-05-2010, 11:19 AM   #12 (permalink)
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thank you for your feedback. Its the original pump. I never touched it. I took the sleds out of storage and now one is acting up on the oil. I will check on the pump updat though w/ my dealer.

Thanks !!!
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