04 Venom running problem- need help !!!

NJNYTRO

NJNYTRO

New member
Joined
Mar 24, 2006
Messages
15
Location
Sussex Cty,NJ
i have an 04 Venom, when I start it with the choke on, runs fine. As soon as I shut the choke off, it will idle, then the rpms begin to climb. They climb up steady and then the sled dies. I pulled the carbs off, they weren't dirty but cleaned anyway. All the boots are in great shape- no tears in the rubber. The carbs are getting fuel to them, at least to the bowls. Could it be a fuel pump? I am kind of at wits end. Any opions would be very appreciated. Also only haas 1,000 miles on it. :o|
 
venom is it a 4stroke or 2 stroke if its a 2 stroke look at those pilots jets they are probably block from dirt
 
All right- now I'm getting a little confused. Cleaned carbs, now breaks up under load, cylinder 3 & 2 , when i remove a plug wire the sled dies. When I remove number one wire- can.t even tell. Change coils and #1 coil works fine on the others so thats not it. Check compression, all three cylinders are the same compression.
Any ideas what I can check next- I am thinking maybe cracked reeds? Kinda of running out of ideas. Might have to suck it up and take it to a dealer but i know its got to be something simple, just cant seem to nail it down :o|
 
How old is the fuel? Did you put fuel stabilizer in it at the end of last season?
 
Start w/ the basics again. Completely clean the carbs, re adjust mixture screws to factory specs, usually 1-2 turns out, double check boots. As long as your that far, pull the reeds & clean..reassemble. & get back to us.. next stop, electrics.
 
All good suggestions above. You can do this, it really is quite simple.

Three things are required to run well -
  • fuel (right air/gas mixture),
  • compression
  • ignition (at the right time).
Determine which one of these three is missing. You have already verified spark and compression, right? Then the fuel mixture is likely not right. When you clean the carbs, be sure to check air flow through each circuit. Make sure it is similar on all three carbs. Make sure the starters (most folks erroneously call them chokes) are all seating right. The significant change you experience after the last carb cleaning suggest that you touched at least part of the problem.

Other things that affect getting the right amount of fuel into the cylinder include (as mentioned above) . . .
  • reed valves not closing (easy to check with carbs off)
  • exhaust passages blocked (pull the pipe and manifold to check)
  • fuel pump pressure (check with a mighty-vac)
  • fuel supply clogged (check carefully with air, check in tank filter/pickup)
  • fuel tank low on fuel (not likely as it should affect all three cyls)
 
Last edited:
Ding said:
All good suggestions above. You can do this, it really is quite simple.

Three things are required to run well -
  • fuel (right air/gas mixture),
  • compression
  • ignition (at the right time).
Determine which one of these three is missing. You have already verified spark and compression, right? Then the fuel mixture is likely not right. When you clean the carbs, be sure to check air flow through each circuit. Make sure it is similar on all three carbs. Make sure the starters (most folks erroneously call them chokes) are all seating right. The significant change you experience after the last carb cleaning suggest that you touched at least part of the problem.

Other things that affect getting the right amount of fuel into the cylinder include (as mentioned above) . . .
  • reed valves not closing (easy to check with carbs off)
  • exhaust passages blocked (pull the pipe and manifold to check)
  • fuel pump pressure (check with a mighty-vac)
  • fuel supply clogged (check carefully with air, check in tank filter/pickup)
  • fuel tank low on fuel (not likely as it should affect all three cyls)
Click to expand...
What would I look for on the reeds? Will it be obvious if the reed valves aren't closing?
 
They can get brittle and crack, bend, curl or even break. You can check with a bright light, but it is best pull them off and check on the bench. They need to lay flat on the opening without any gaps.
 
You must log in or register to reply here.


Back
Top