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You are describing a fuel problem. Put a pressure gauge on it. You are running out fuel under heavy load or wide open throttle. Fuel pump or pressure regulator or not enough fuel in tank.

Yes it seems to be crap compared to old site. I just called him and left a message. Site I thought was useless.

I have a used rear cooler for an attak. 4142541495

Got my attak in July of 05. Now have 11 and 17. Sled would stay with yamacharged and dyno tuned attak.Just sold at 4400 miles. Was tough to part with.

We searched the whole country. Found the last 2 , 2017 apex xtx's in southern Illinois .

Do you have Muffin works 136 billet rails for Apex yet ?

I went with Ulmer's air box and fuel and ignition modules. My opinion is it was the best investment I made. Significant increase in performance. Enough increase to stay even with the yamaha chargers that were tuned on the dyno and beat them.

If you still have the coolers and they are the large ones, I will take both

I think thor is correct. Check the hose again. You are not getting suction. The line is fine when cold but when it gets hot it expands and does not hold suction most likely. This is especially true if it gets hot or gets porous from old age.

Honda works. I just used the Yamaha because it looks totally stock.

Or put a 170cc Yamaha engine in it.That is all you will need.

Switch to #35 chain and regular go kart racing clutch. All else fits. Did this a number of years ago. I put a cam in it with the racing valve springs and cut the head slightly. At 165# I could ride it in the grass in the summer. Radar at 48 mph but it could clearly handle any gear for more top end.

I have a Ballistic also that is a 405 I think. It is in a none supercharged Apex. It has started it at -20 just by turning the gauges on for 30 seconds or so three times.

Could be EXUP but I would wait until you get around 1800 to 2000 miles. Unless you broke it in hard you will get 10500 at about 1800 to 2000.

Clean out the brass body that the idle screw is in. Do not change the four screws on top as those balance the cylinders. Take everything else apart and clean as thoroughly as you can. I used acetone. You can also search on this site and I think it is talked about elsewhere.

Try a local circle track racing supply store. They will have a large variety of what you need.

These are generator motors.Buy a generator and take the motor out and use that if you want totally stock look. I did 170cc with cam and valve springs and drilled out muffler. Ran out of gear on radar at 47mph.

You still need to soften, lower the rear end. The mega at stock has no bottom out protection so I would still do the Hygear mod to eliminate that potential problem and revalve to her weight. That would give you a lot more flexibility, save possibly having to buy a new mega if it bottoms out...

Get rid of the tuner5 skis.

Get the Hygear mega modification and set to their specs for her weight. Probably will be at about 150# of air. Get the HYgear Dual pressure kit for the fronts, Set the shocks at about 60# and the res at about 125# as I remember. Front lower arms should be about level. If there is still darting...