Hi, I am experiencing an idle surge on my walk behind leaf blower. It runs great for the first 5 minutes and really moves the leaves very well. Then after 5 minutes of running the motor it will idle very very low and then rev back up. This will continue every 30 seconds or so and sometimes the motor will even die out. I am not sure what to really look for 1st.
First thing that I would do is drain the carburetor bowl and spray it out. If that didn't help, then I'd turn the fuel mixture screw counter-clockwise about 1/16 turn. See if that makes any improvement. If it needs more, then turn in small increments until you get it running properly. Then run some gas treatment like Sea Foam or Lucas through the gas tank. That shoul help some at least.
I would pull the carb and give it good bath or have it ultrasonically cleaned. When reassembling it, replace the float needle and seat. Have found that this works 90% of the time.
I would pull the carb and give it good bath or have it ultrasonically cleaned. When reassembling it, replace the float needle and seat. Have found that this works 90% of the time.
I always recommend buying parts from a small engine dealer. Take your numbers with you and have them look up the parts needed. This way you have a face to talk to, if for some reason they are not right. They may also give some advice as to the best way to clean it.
#8
EngineMan
This is the parts manual for that engine which should help you with numbers.
While you have the carb off, you should check your valve clearances, if the gasket on the valve cover/breather breaks, it is a cheap gasket.
I am guessing that you will find your clearances my be too tight. If that is the case, just adjusting the valves would get you by, but a proper
valve job would be the best cure..
I was at my local power equipment dealer yesterday and I mentioned the issue and he said the 1st thing he would check is the coil. Any merit to this opinion? Where would I find the manufacturers resistance specs?
In my opinion the dealer doesn't know what he is talking about. Your description of the problem indicates a fuel problem. Clean the carb real good and as I said before install a new float needle. Part number 394681 if you have a gravity feel system or part number 394683 if you have a fuel pump. Also clean the fuel lines and make sure there is nothing in the tank, which might be plugging the fuel outlet. This manual might also help out.
Hope your dealer isn't just trying to $ELL you a coil. Even if you replaced the coil and it did the same thing, you're stuck with the coil. Coils aren't cheap! Go through that fuel system and replace the parts Rivets told you about and you should be fine with it. Sounds like some fuel-starvation issue to me.
