Pilot jets blocked!
#1
Pilot jets blocked!
I've got my carburetors stripped down and I've cleaned them out but I'm sure the pilot jets are still partially, if not fully, blocked. I've had them soaking in carb cleaner but they still look blocked. I know you are not supposed to poke anything down them but the holes are so small I doubt I could find anything to poke through. I'm sure these are the cause of my lumpy idle and low speed running. Any ideas?
Thanks.
Thanks.
#3
#4
#6
As already mentioned, let some carb cleaner soak, use compressed air to blow through the orifice, and repeat, until clear - letting the jets soak in an ultrasonic cleaner is also an easy way to get those clear, but with carb cleaner and compressed air, you really shouldn't need anything else.
Now lets just pretend the orifices in your pilot jets are actually clean - there is another thing to consider here, and that's your pilot screw settings - if they are turned in too far, this will lean out the pilot circuit.
1) How many turns out from lightly seated are your pilot screws? Are all of them set consistently, from one carb to the next?
2) Do you have an OEM-type paper air filter, or a hi-flow re-cleanable filter, like a K&N, UNI, or BMC... also, regardless of which you have, is it clean, and in the case of the re-usable type, is it clean AND properly oiled?
3) Do you have a race header, and/or a very unrestrictive, short muffler?
Now lets just pretend the orifices in your pilot jets are actually clean - there is another thing to consider here, and that's your pilot screw settings - if they are turned in too far, this will lean out the pilot circuit.
1) How many turns out from lightly seated are your pilot screws? Are all of them set consistently, from one carb to the next?
2) Do you have an OEM-type paper air filter, or a hi-flow re-cleanable filter, like a K&N, UNI, or BMC... also, regardless of which you have, is it clean, and in the case of the re-usable type, is it clean AND properly oiled?
3) Do you have a race header, and/or a very unrestrictive, short muffler?
#7
Thanks for all the replies, I never thought about compressed air and a great idea only I don't have a supply of it here. Maybe I can take them somehwere to have them blown through. The pilot screws were all set to the same of approx. 2 1/4 turns out from the seated postion. The bike is standard everything and paper air filter. I better check the whole pilot circuit too as there are very fine holes there that could also be blocked up.
#9
An air compressor is such a useful thing to have when you've got a bike - you know, you should be able to score a cheap pancake air compressor for 75£ to 90£.
Last edited by JNSRacing; 01-21-2014 at 09:50 AM.
#10
Thanks for this.
I checked with some WD40 squirted through where the pilot jets screw into and three jets emerged from all three holes in the carb body except for the last one which has only two sprays so one must have a blockage. I will get some carb cleaner and air in there this weekend. :-D
I checked with some WD40 squirted through where the pilot jets screw into and three jets emerged from all three holes in the carb body except for the last one which has only two sprays so one must have a blockage. I will get some carb cleaner and air in there this weekend. :-D