'82 Yamaha 650 maxim trouble
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John H

Bonner Springs, KS

#1 Jan 31, 2008
I recently moved my bike 6.5 hours on its side in the back of my pick up truck. When I started it a couple of days later Gas and all of the oil came out of the vent tube out the air box. I fugured it was just from it laying on its side. Then I changed the oil, oil filter, and air filter. Then when I turned it over it started for a second then backfired and died. I kept on turning it over and gas and oil came out of the same spot. I took off my carbs and cleaned them and tested to see if they were leaking and they weren't and my petcock is working fine but I am afraid to spend another $40 on oil and an air filter. would anyone have any other suggestions? or am I ready to try it again?
John H

Kansas City, MO

#2 Feb 2, 2008
What are some reasons that oil would come out of my crankcase vent tube that runs to the air box? I only put in 2 qts of oil and it is spurting out?????
rick c

Columbia, SC

#3 May 10, 2008
I have a maxim x with same problem did you find a solution
Chad L

Manchester, NH

#4 Jul 13, 2008
I have an '82 Maxim 650. Runs so-so and needs a new carb, which I have but didn't get put on yet. It just started losing a lot of oil out of the air cleaner box, through the hole in the bottom. Oil gets soaked into the air filter as well. I have no clue what would cause this or how to fix it. I am wondering if it is even worth fixing due to the age and value of the motorcyle. Anyone on here have any ideas?
phil f

Lisbon Falls, ME

#5 Jul 21, 2008
i also have this problem with my 82 750 maxim it will run and than when you tac up oil will come out of carb bad what is this can anyone help

United States

#6 Aug 13, 2008
Try flushing the motor i did on my bike and it was the same problem and it worked great i have an 1982 yamaha 750 maxim
j troetsch

Berlin, Germany

#7 Oct 17, 2008
Richard I have the same problem that the other with gas coming out the air box,how did you flush your motor?
j troetsch

Berlin, Germany

#8 Oct 17, 2008
how did you flush your motor?
Chad L

Boston, MA

#9 Dec 30, 2008
Richard wrote:
Try flushing the motor i did on my bike and it was the same problem and it worked great i have an 1982 yamaha 750 maxim
Richard - can you give us some more specifics on what you did to solve the problem? Thanks.

Victoria, Canada

#10 Apr 25, 2009
Chad L wrote:
<quoted text>
Richard - can you give us some more specifics on what you did to solve the problem? Thanks.
Did you ever figure out a solution to the oil/gas in the airbox problem?

Lehighton, PA

#11 May 10, 2009
I have a yamaha maxim 650 and i dropped my bike on accident then i picked it up and a line coming from the airbox came off and gas came out. oil light comes on when i try to start it.. can't figure out where the hose goes to.. please help thanks

Portland, OR

#12 May 16, 2010
I also have a yamaha 650 maxim. My oil light comes on when i try and start my bike as well. The thing wont turn over at all. any ideas?

Brookfield, IL

#13 Jun 13, 2010
i have a yamaha maxim 750 and recently oil is pouring out of the intake. i rode it the other day and shut it off and ten minutes later oil came pouring out of the intake. any ideas????

Since: Jul 10

Ludhiana, India

#14 Jul 18, 2010
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Engine and transmission:
Displacement: 600cc
Engine type: In-line four, four-stroke, Liquid-cooled, DOHC
Compression ratio: 12.4:1
Maximum Power: 91.0 Kw @ 14,500 rpm
Maximum Torque: 65.7 @ 10,500 rpm
Bore x stroke: 65.5 x 44.5 mm
Valves per cylinder: 4
Fuel system: Injection
Ignition: Digital DC-CDI
Gearbox: 6-speed
Final drive: Chain

Seat height: 820 mm
Overall height: 1,090 mm
Overall length: 2,024 mm
Overall width: 688 mm
Wheelbase: 1,379 mm

Brakes and wheels:
Rake: 24.0°
Trail: 86 mm
Front suspension: 43mm fork
Rear suspension: Single shock
Front: 120/60-ZR17
Rear: 180/55-ZR17
Front: Double disc
Rear: Single disc
Front brakes diameter: 298 mm
Rear brakes diameter: 220 mm

Physical capacities:
Gross weight: 186 kg
Fuel capacity: 17.03 L
Color options: Team Yamaha Blue/White, midnight black

Since: Jul 10

Ludhiana, India

#15 Jul 18, 2010
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Engine and transmission
Displacement: 942 cc
Engine type: V2, four-stroke, air-cooled, SOHC
Compression ratio: 9.0:1
Bore x stroke: 81.0 x 63.0 mm
Valves per cylinder: 2
Fuel system: Carburettor
Ignition: TCI: Transistor Controlled Ignition
Gearbox: 5-speed
Final drive: Shaft drive
Clutch: Wet multi-plate clutch

Seat height: 709 mm
Height: 1,105 mm
Length: 2,451 mm
Width: 930 mm
Wheelbase: 1,626 mm

Brakes and wheels:
Frame type: Steel; hidden shock
Rake: 32°
Front suspension: Telescopic fork
Rear suspension: Single shock
Front: 130/90-16
Rear: 170/80-15
Front: Single disc
Rear: Drum brake

Physical capacities:
Gross weight: 264.4 kg
Fuel capacity: 15.89 L
Color: Raven black

Marietta, PA

#16 Jul 31, 2010
i need help, I've got this 1981 maxim didnt work wen i bought it an i've got it to run now but my rpm's shoot up to 11rpm.... how do i get that to run smoooothly? do i need to have tubes on my carbarater for descent air flow?

United States

#17 Jun 20, 2011
I have a 650 maxim and was riding it home from getting it's inspection and the clutch got stuck and now it can only move from 4th to 5th gear...hoping it's just a spring...anyone have this problem before??

International Falls, MN

#18 Jul 22, 2011
I have an 82 650 yamaha Maxim also. The manual calls for 20/40 wt oil above 40 degrees. My local parts store has amsoil synthetic 20/50 wt oil. Any reason I shouln't use this?

Antipolo, Philippines

#19 Oct 25, 2011
Engine flush - should get rid of the blocked oil passages and keep oil from spurting all over the place... The gas coming from the carbs means you need to overhaul the carbs (seals are leaking or the plunger isn't seating anymore cause its worn or the float height needs to be set). If it won't turn over and the oil light is on (and you have a good battery, good starter relay, and good starter motor) means you have a seized engine - time to get a new bike or overhaul your engine (if you can find the parts)... The line that supposedly came from the airbox that came off when Andy dropped his bike is the fuel line - it only looks like it came from the airbox because the airbox is connected to the carbs, it actually goes to the carbs... wish you luck getting your bikes fixed guys...

Dayton, OH

#20 Aug 9, 2012
u should probably know that the 82 650 maxim has a kick stand safty switch if u try to start it with the bike in gear with the kick stand down the oil light will flash and it will not crank over put it in neutral or lift ur stand

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