So my quad has been idling rough, occasionally stalling at idle, and then last weekend going up a hill stalled and really fought me to start again....
After some reading on the interwebs, my issues seemed to be inline with a dirty fuel filter. Check this out for more info: Nyroc's ATV info website
The quad has almost 3000 miles on it, so it probably is about due for a change. I ordered a fuel pump upgrade kit for $30 from Amazon.
The stock unit was apparently very expensive, so I will only go down that road as a last ditch effort. The kit from Amazon is set to arrive today.
I pulled the quad apart Sunday. I had to remove the battery, disconnect all electronics under the seat, and remove the large back plastic. Then the fuel tank is easy to get at. Next, I disconnected the fuel line at the pump and connected a fuel pressure tester I picked up at Harbor Freight.
Fuel Pressure Tester & Fuel Injection Pump Tester
Then you have to reconnect all the electronics so the fuel pump kicks on when you turn the key. If done successfully, you will get a pressure reading. Mine read 38 psi. You should be getting 43 psi at the pump which is what the engine is tuned to run on. If you work out the maths here, that is roughly a 12% difference, which means the engine is less fuel (not sure of the relation from pressure to delivery). I have an HMF optimizer on my engine, but I am not entirely sure how that factors in as well. I'd venture to say that it adjusts the length of the injector pulse to allow more fuel to the engine, but I am not positive.
That is as far as I have got so far. I will take some picture when I work on it tonight.
After some reading on the interwebs, my issues seemed to be inline with a dirty fuel filter. Check this out for more info: Nyroc's ATV info website
The quad has almost 3000 miles on it, so it probably is about due for a change. I ordered a fuel pump upgrade kit for $30 from Amazon.
The stock unit was apparently very expensive, so I will only go down that road as a last ditch effort. The kit from Amazon is set to arrive today.
I pulled the quad apart Sunday. I had to remove the battery, disconnect all electronics under the seat, and remove the large back plastic. Then the fuel tank is easy to get at. Next, I disconnected the fuel line at the pump and connected a fuel pressure tester I picked up at Harbor Freight.
Fuel Pressure Tester & Fuel Injection Pump Tester
Then you have to reconnect all the electronics so the fuel pump kicks on when you turn the key. If done successfully, you will get a pressure reading. Mine read 38 psi. You should be getting 43 psi at the pump which is what the engine is tuned to run on. If you work out the maths here, that is roughly a 12% difference, which means the engine is less fuel (not sure of the relation from pressure to delivery). I have an HMF optimizer on my engine, but I am not entirely sure how that factors in as well. I'd venture to say that it adjusts the length of the injector pulse to allow more fuel to the engine, but I am not positive.
That is as far as I have got so far. I will take some picture when I work on it tonight.
