I recently took in a project its a 98 srx 600. the guy said it hasn't run it in a couple years. I thought maybe a carb clean and drain the fuel tank. well I did both of those things. the carbs were gummed up. I got them clean and then tried to start it. it would start but didn't sound right. I felt the pipes and the middle cylinder was cold. so I took the carbs back off. they were still spotless. I did compression check and the middle cylinder and 0 compression. the guy said he didn't want to spend the money to fix it so he gave it to me for my time working on it. I got a new jug and piston put it on and then all cylinders were within 3 pounds of eachother on compression. I cleaned and set the power valves. well the dang thing still wont hit on the middle cylinder. I checked the fuel pump and it would pump out of the 2 outside lines but nothing came out the hose for the middle cylinder. I thought the pump was weak so I got a new one. I got it on last night and put it on still no go. I took the carbs apart again to check them. I also adjusted the float just a bit. well after I got them back on it hit on all three I thought I had the problem fixed I ran it for 10 min to bleed the water. and then I put the air box back on and put it all back together and now it only hits on the outside two. im about at my wits end with this thing. any help would be greatly appreciated. the only thing I haven't checked is my reeds
move the spark plug wires around and see if the missing cylinder follows the wires, they all fire at the same time anyways.
when you pull the plug out of the cylinder that isnt running, is it wet?
when you pull the plug out of the cylinder that isnt running, is it wet?
it seems wet. oil wet? it doesn't smell gassy. i tried moving wires around still stays on middle cylinder. i sprayed a shot of either in back of the carb and it took right off until the ether ran out. i didn't use much just a small shot. just to see if it was fuel issue.
when you say they all hit at the same time. does that mean the pistons run together? because they are definatly not all at tdc at the same time.
well, then you need to pull the carbs again and pull out the pilot jet and take carb clean and spray it up into the spot where the pilot jet screws into the carb, it will then come out of the little orfice in the front throat of the carb if its open in the pilot circuit.
next step is to pull the float pin and check the screen above the needle and seat, siee if its plugged up.
while you have the carbs off you can see in the reed cage, broken reed makes them run rich, so i doubt thats the issue but you can see in there easily.
next step is to pull the float pin and check the screen above the needle and seat, siee if its plugged up.
while you have the carbs off you can see in the reed cage, broken reed makes them run rich, so i doubt thats the issue but you can see in there easily.
okay i will check again. the screen was spotless from day one. i sprayed fuel in the pilot orifice last night and it came out like it was supposed to. the needles are moving.... i just don't know whats going on.
then the only thing left that wont allow it to get fuel in that carb is the needle and seat, the needle must be worn and hanging up inside the seat shutting off the fuel flow.
did you use compressed air in the carb metal fuel line inlet and check the needle and seat operation?
pay attention when you take off the carb rack dont tip them anymore then needed and remove the bowl screws from underneath on the middle one, see if theres gas in the bowl.
did you use compressed air in the carb metal fuel line inlet and check the needle and seat operation?
pay attention when you take off the carb rack dont tip them anymore then needed and remove the bowl screws from underneath on the middle one, see if theres gas in the bowl.
no, the pistons are each at 120 degrees apart, but the old ign systems with the single headlight sleds fire all the spark plugs at the same time for all 3 cylinders, yes, it waste spark on the other 2.
when i took the carbs off last night the bowl did have fuel in it. good mixed fuel. i did not try compressed air to the inlet how much pressure should you run when testing it? 5 or 10 psi?
i read through your carb cleaning post you had in the tech pages. if the air jet was plugged would that cause my problem? because ive never checked that.
Could it be a crank seal if so how hard is it to pull the motor and change
Devilin AblueDress!
New member
Unlikely a crank seal would cause a no fire issue, would typically fire and be lean. Lets revisit your first post for a moment. Center cylinder was the one with 0 compression right? What did the previous cylinder/piston look like? Did you find what caused this 0 compression issue? If not I think you have now found it. Carb cleaning is becoming more and more nessecary due to fuel, especially after loosing a piston/cylinder. Just to rule out an odd fuel pump issue swap hoses from PTO to center and see what happens.
if the carb has fuel in it but it wont fire and it has compression then the pilotjet circuit is plugged up in that carb, sorry theres nothing else. I would pull the carbs and go thru them again,
you can see light thru the jet when you hold it up?
use carb clean spray hose and be sure the carb cleaner comes out the idle orfice hole in the front side of the carb.
well that means the inlet is open than, i just use a little bit of air and manually open and close the float to be sure the needle works good, i doubt thats the problem if theres fuel in the bowl, its pilot jet circuit related-plugged.
I have cleaned them about 10 times. I can see through the jet and its a perfectly round hole clear thru. And carb cleaner comes out on the throat side when I spray it im the pilot jet opening. I must be missing something. I am getting real frustrated with this sled. I will go thru them again and let u guys know. Thanks for helping
if its got compression, you changed piston/ rings....
if its got gas,you say bowl is full of gas...
if its got spark, you siad it was good and the same when you swapped wires to other cylinders, so that rules out spark plug cap,coil,wires, and cdi problem.........
no matter how frustrating your missing something in there somewhere, the gas goes into the fuel bowl on the carb, it then goes up into the pilot circuit in the carb and out thru the orfice in front. The pushing/ pulling of the piston draws the mixture thru the carb into the engine at idle, then airspeed thru the venturi pulls the fuel up thru the needle jet.
if its got gas,you say bowl is full of gas...
if its got spark, you siad it was good and the same when you swapped wires to other cylinders, so that rules out spark plug cap,coil,wires, and cdi problem.........
no matter how frustrating your missing something in there somewhere, the gas goes into the fuel bowl on the carb, it then goes up into the pilot circuit in the carb and out thru the orfice in front. The pushing/ pulling of the piston draws the mixture thru the carb into the engine at idle, then airspeed thru the venturi pulls the fuel up thru the needle jet.
does it run on that cylinder with the choke on and then quit when choke is off?
It seems like it doesnt make any difference. I know im missing something really simple and its causing me frustration. I will get it. Im not one to give up. I sprayed a lil ether in the carb and it took right off...but the plug seems wet when I take it out
I have cleaned them about 10 times. I can see through the jet and its a perfectly round hole clear thru. And carb cleaner comes out on the throat side when I spray it im the pilot jet opening. I must be missing something. I am getting real frustrated with this sled. I will go thru them again and let u guys know. Thanks for helping
you know what else to look for,... you said it was blown up in the middle cylinder, start it up and spray brake clean at the case see if you can get it under the case down in front, if it picks up and runs it may have a blown out case bottom,pressure cracked and it will not have suction to the carb then to draw in fuel because its drawing air from under the engine. I have seen this a few years ago, now that you mention the choke doesnt make it run either........