I am looking for some help from those in the know. I just finished helping my nephew rebuild the 800R in his 2007 Summit Adrenaline 151. The engine is the updated engine with the "R" stamped on it. We have finished the re-assembly and install back into the sled and am now have some issues that are behaving like it is starving for fuel. It was rather difficult to start for the first time after the rebuild. We pulled and pulled on the rope for 20-30 pulls with no luck. We pulled the plugs to check for spark, all good there, it has great spark. We left the plugs out for a few more pulls till we could smell fuel in the plug holes. Re-installed the plugs pulled the rope once and away she went. It ran for maybe 3-4 mins and then just idled down and stalled much like when you run out of gas. It was getting late so we left it for a couple days and went back to it. When we did get back to the sled it fired right up on the second pull warmed up fine, then we took it out around the yard to make sure it would stay running. All seemed fine through the full range of the throttle and when we pulled back up to the shop and let off of the throttle it idled right down and stalled again.
That covers the problem. Now to give you a little insight as to what has been checked. When it was apart for the rebuild the carbs were opened up and cleaned. It has 480 jets in it that were removed and cleared. The pilots were also removed and cleared and the needle clip is set right in the middle, the pilot screws are set to 1 1/2 turns out, the slides were set according to the manual and synchronized with each other. The fuel line was disconnected and checked to be sure it was clear before re-assembly. The check valve on the gas tank was checked to be sure it was operational to allow the tank to breathe. The impulse line was removed from the engine and checked to be sure it was clear and re-installed. The intake boots and reeds are in great shape are from v-force.
I did some research on the forum thinking that it was maybe a weak fuel pump not being able to keep up in filling the carbs. From what I was able to find the fuel pump either works or it doesn't. If it doesn't work I read that the diaphragm is likely cracked and fuel will be leaking from it. The fuel pump on the sled is not leaking and does provide fuel but the sled just wants to stall out after a short running cycle.
I am at a loss at to what else to check to resolve this issue. If you have any ideas or know someone who does I would love to hear you suggestions.
That covers the problem. Now to give you a little insight as to what has been checked. When it was apart for the rebuild the carbs were opened up and cleaned. It has 480 jets in it that were removed and cleared. The pilots were also removed and cleared and the needle clip is set right in the middle, the pilot screws are set to 1 1/2 turns out, the slides were set according to the manual and synchronized with each other. The fuel line was disconnected and checked to be sure it was clear before re-assembly. The check valve on the gas tank was checked to be sure it was operational to allow the tank to breathe. The impulse line was removed from the engine and checked to be sure it was clear and re-installed. The intake boots and reeds are in great shape are from v-force.
I did some research on the forum thinking that it was maybe a weak fuel pump not being able to keep up in filling the carbs. From what I was able to find the fuel pump either works or it doesn't. If it doesn't work I read that the diaphragm is likely cracked and fuel will be leaking from it. The fuel pump on the sled is not leaking and does provide fuel but the sled just wants to stall out after a short running cycle.
I am at a loss at to what else to check to resolve this issue. If you have any ideas or know someone who does I would love to hear you suggestions.
