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I was thinking some more on my issue of it running poorly at higher RPMs...If the ignition advance wasn't working correctly and advancing the ignition as RPM increased, I'm thinking that would cause the same symptom..?

I had some stale gas in the tank, and pulled the plug from the bottom and cleaned it. Also, I have a 'stone" type filter, and it does not appear to be plugged. I set the carbs up on the bench and adjusted the float levels while off the bike. I ran a fuel line "extension" from the output of the...

I purchased my '85 Max in 2005, had 18K miles on it, from a dealer/friend in Michigan. It ran like a raped ape, with the following exception, when pulling hard in low gear, it would jump in/out of low gear at about 8 grand or so under heavy throttle. No problem, a shift fork, couple gears and a...

Which way is the arrow on the little 1 way valve supposed to point? Manifold or ignition advance module...?

I syncronized the carbs, they were a bit off. When at wide open throttle, carb sync doesn't enter into the equation, as all of the carbs are wide open. After re-syncing, I noticed the vacumn line attached to the left front cylinder had an arrow on it: can you identify what this vacumn line is...

Some time back, I had my 85' Max apart to replace low gear, and to install a Venture 5th (overdrive ratio) while I was in the tranny. Now, I find that as I accelerate through the gears, at the point (about 7000 rpm or so) where it used to rip my arms out of their sockets, it seems to go flat and...

How much do you want for the used seat assy? (front and rear) I have an aftermarket one, and would like to sometimes use a stocker......

Looking for a fairly new (not worn/torn) seat assembly for my '85 Max. I had my seat redone by Jon at UFO (Starfighter). It is very comfortable on the tailbone, but it sits a little low and the arm/handlebar/seat/foot relationship isn't right for me. Has only been used (ridden 6-8 times) in the...

I have an '03,YZ450F, '06 YZ450F SE, 3 '74 YZ 250A, 2 YZ360A, a Bengt Aberg 500 replica, a 74 YZ 125A, and a dead FE 501 Huseberg lying in the woodshed....More than once, reaction times honed off road have saved my bacon when reacitng to "infringing" traffic..

As a response to the "O" ring issue: I stopped off at my friendly local KTM dealer, and he had an assortment of "O" rings, one size of which, fits Mr. Max...he said it is a common item to replace, and most of the carbs use the same "O" ring....

I guess I got in on the middle of this discussion. What sort of mods/accessories accompany this carb slide Mod? I have a stock motor, and it sounds like I would enjoy the type of throttle response you're describing...

I recently had the motor out of my '85 Max for tranny work (installed 5th gear from a Venture) and took it out for a test ride last evening. everything seems to be in order, except the V-Boost doesn't engage. Also, the normal "ignition on" whine (from V-Boost) does not occur. I suspect a loose...

I was cleaning the carbs on my '85 Max the other day, and noticed 2 of the idle mixture screws were missing the "O" ring that goes onto the idle mixture screw "stack". Yamaha does not sell this "O" ring separately. does anyone know where I can get an "O" ring that will fit?