Carb Problems
#1
Carb Problems
I was hoping someone could give me some advice on my carb.
Problem: over the winter, my 2001 sp 400 would not start. I put it in my garage, heated it up - it still wouldn't start (and yes, it had fuel). I finally sprayed starter fluid into the air intake and with full throttle, it started - however, it wouldn't stay running without pressure on the throttle. I cleaned the carb, checked the fuel filter, cleaned my K&N air filter, and adjusted the idle, and it would stay running, but when I would ride it for a while, the idle would rev up a bit...I adjust the idle down and it would run just fine, but when I start it again (cold), I have to adjust the idle back up to keep it running (can you say run on sentence?).
Any advice? New needle valve? Jets?
Problem: over the winter, my 2001 sp 400 would not start. I put it in my garage, heated it up - it still wouldn't start (and yes, it had fuel). I finally sprayed starter fluid into the air intake and with full throttle, it started - however, it wouldn't stay running without pressure on the throttle. I cleaned the carb, checked the fuel filter, cleaned my K&N air filter, and adjusted the idle, and it would stay running, but when I would ride it for a while, the idle would rev up a bit...I adjust the idle down and it would run just fine, but when I start it again (cold), I have to adjust the idle back up to keep it running (can you say run on sentence?).
Any advice? New needle valve? Jets?
#2
Quad Patrol
Don't let the hp numbers fool you. Its all in how you get it to the ground. Clutching clutching clutching!
Don't let the hp numbers fool you. Its all in how you get it to the ground. Clutching clutching clutching!
#3
Carb Problems
When you say you cleaned it, do you mean that you took a apart and cleaned it, or just sprayed some cleaner in it? It sounds like your jets are dirty to me. Goto my gallery and there is a link for the Mikuni carb manual .pdf at the top of the page. Should have everything you need to know about your carb...
#5
#6
#7
Carb Problems
The 400 Sportsman does have valves and it is a 4 stroke. Check the throttle safety thing inside the throttle cover to make sure there is a gap between the connectors as well. I forget what they call this adjustment but it can loosen up and keep the quad from running right. Then I would check the valve adjustment. If you take off the timing chain inspection plate and valve cover you just ling up the motor to TDC by aligning the two horizontal lines on the cam shaft gear with the horizontal line of the case and then check the valve clearances with a feeler gage. The valve lash is supposed to be .006 on intake and exhaust. Just insert your feeler Gage and adjust the valves until there is a slight drag on the feeler gage.
Don't attemp this unless you think you can do it as engine damage can occur if you do it wrong.
Don't attemp this unless you think you can do it as engine damage can occur if you do it wrong.
Trending Topics
#8
#9
Quad Patrol
Don't let the hp numbers fool you. Its all in how you get it to the ground. Clutching clutching clutching!
Don't let the hp numbers fool you. Its all in how you get it to the ground. Clutching clutching clutching!
Carb Problems
Originally posted by: Redbullssg
This is a 400 I believe...
It doesn't have valves that would stick... 2-cycle
Originally posted by: ftwflh
Have you ever had the valves adjusted on it? A tight intake valve can cause it to act like this.
Have you ever had the valves adjusted on it? A tight intake valve can cause it to act like this.
It doesn't have valves that would stick... 2-cycle
#10
Carb Problems
What I would do...if your having these problems....take the carb off...take out the pilot and main jet and clean them with some gunkout...clean the float bowl....then I would make sure you have a good clean air filter on it.....and also, if you had your quad sitting for a while...maybe the gas has some moisture in it..........I would drain the gas and put some fresh in (even though that right now would be a little expensive with these gas prices!) After that...see if she runs better..
quadracer
quadracer