Jbrum
XS400 Member
So I put my engine back in ( i recently had a guy replace all of the gaskets in it) and hooked everything up. I welded the dime city shorty slash cut mufflers to my headers repacked the baffle and wrapped the pipes. bike started up wonderfully...well much faster than I expected but it had an issue, bike won't rev at all. I have to completely have the throttle open just to almost make it go up...almost. every couple of secs it sounds like it wants to go up but doesn't. I can have it completely open and it doesn't make a difference in sound
So after reading some threads on here I've tried:
Checking the cable. definitely working the way it should.
I've checked to make sure the butterflies open and close when i'm hitting the throttle and off the bike they are. I've tried taking the air boxes off and seeing it the slides are moving at all when I throttle....They aren't. I tried using a screw driver and lifting them up and the engine starts to die. I tried spraying starter fluid with the air box off and I see flames shoot out but the bike doesn't rev at all.
I adjusted the floats (brass floats at 26mm) i've cleaned the jets/carb now for the third time and soaked them in seafoam using carb brushes and copper wire to make sure they're not blocked in anyway.
So I'm going to try to adjust the valves tomorrow, Also switching plug wires around. is there anything else I can try?!?
The only thing different now is exhaust is welded where as before they were just clamped on and I didn't have any packing in the baffle before. Jets worked fine before, is it too much back pressure now so I have to re-jet? I should at least get some kind of indication of rev'ing if its the wrong jets now for my set up shouldn't I? if its valves ( ive had them for sure wrong before and i at least got it to rev it did so crappy but it still worked) same lash/clearance as the manual states?
All of my mechanical experience is from this site and youtube. So far so good but I've exhausted my wealth of knowledge on this one.
Thanks in advance .
So after reading some threads on here I've tried:
Checking the cable. definitely working the way it should.
I've checked to make sure the butterflies open and close when i'm hitting the throttle and off the bike they are. I've tried taking the air boxes off and seeing it the slides are moving at all when I throttle....They aren't. I tried using a screw driver and lifting them up and the engine starts to die. I tried spraying starter fluid with the air box off and I see flames shoot out but the bike doesn't rev at all.
I adjusted the floats (brass floats at 26mm) i've cleaned the jets/carb now for the third time and soaked them in seafoam using carb brushes and copper wire to make sure they're not blocked in anyway.
So I'm going to try to adjust the valves tomorrow, Also switching plug wires around. is there anything else I can try?!?
The only thing different now is exhaust is welded where as before they were just clamped on and I didn't have any packing in the baffle before. Jets worked fine before, is it too much back pressure now so I have to re-jet? I should at least get some kind of indication of rev'ing if its the wrong jets now for my set up shouldn't I? if its valves ( ive had them for sure wrong before and i at least got it to rev it did so crappy but it still worked) same lash/clearance as the manual states?
All of my mechanical experience is from this site and youtube. So far so good but I've exhausted my wealth of knowledge on this one.
Thanks in advance .