wolfy77
XS650 Member
Let me start out by giving many thanks to all that take the time and energy to contribute and help out all in need.
Here's what I have:
78 SE- bought as a non-runner.
Like many of us posting I've popped in HHB PMA, PAMCO ignition (temporarily set at the mid point as per Pete's instructions) with the ultimate coil. Running with a single cap (gets 12+volts while kicking). The ignition and charging systems are all that's wired in presently.
I bought a set of barely used and very clean VM34's from someone on here, which originated from 650central along with aluminum carb holders and fresh boots.
I'm trying to baseline them with the following:
pilot - 22.5
needle clip - 3rd (mid)
main - 190
float height - 24mm.
I begin each attempt with the idle screws 1 turn out and the slides set 1/16" to start (might be too much but only cause I can't get it to idle).
cam chain tension is good and the valves are in spec.
BPR7ES plugs gapped to 35
Rotella 15W40
compression reads 135 Left & only 120 on the right. (too low?) Seems to hold.
The bike fires up immediately but will only continue to run if i hold the throttle open approx. 1/4. No amount of adjusting the mixture screws or the throttle screws seemed to help achieve idle.
I have swapped the pilots both up (25) and down (20). The 25 only increased the already gassy smell in the exhaust and the 20 caused the RPM to run away a few times (indicating lean). I'm back to 22.5 for now. I've also adjusted the float height to 23mm, then 22 and now I'm back to 24mm.
After spending a few days swapping jets, resetting screws etc I noticed that at some point I lost the left cylinder. I swapped the plug wires to see if the problem followed but it kept to the left. I pulled the plugs and the left was clean and wet (gas) and the right was black and sooty. Once a fresh plug is put back the cylinder comes back to life.
I have been thinking that up to now that it's soley been a carb tuning and timing problem , so I've read and re-read all the mikuni tuning info on this site and others and even picked up a Sudco manual. I understand the theory and procedures well enough (or so I think) and am starting to think that if it where only a carb issue i would have at least achieved a rough idle by now.
I'm hoping some one may provide some new train of thought on this or tell me to keep at 'er.
Apologies for being long winded here but I didn't want to leave anything out.
Here's what I have:
78 SE- bought as a non-runner.
Like many of us posting I've popped in HHB PMA, PAMCO ignition (temporarily set at the mid point as per Pete's instructions) with the ultimate coil. Running with a single cap (gets 12+volts while kicking). The ignition and charging systems are all that's wired in presently.
I bought a set of barely used and very clean VM34's from someone on here, which originated from 650central along with aluminum carb holders and fresh boots.
I'm trying to baseline them with the following:
pilot - 22.5
needle clip - 3rd (mid)
main - 190
float height - 24mm.
I begin each attempt with the idle screws 1 turn out and the slides set 1/16" to start (might be too much but only cause I can't get it to idle).
cam chain tension is good and the valves are in spec.
BPR7ES plugs gapped to 35
Rotella 15W40
compression reads 135 Left & only 120 on the right. (too low?) Seems to hold.
The bike fires up immediately but will only continue to run if i hold the throttle open approx. 1/4. No amount of adjusting the mixture screws or the throttle screws seemed to help achieve idle.
I have swapped the pilots both up (25) and down (20). The 25 only increased the already gassy smell in the exhaust and the 20 caused the RPM to run away a few times (indicating lean). I'm back to 22.5 for now. I've also adjusted the float height to 23mm, then 22 and now I'm back to 24mm.
After spending a few days swapping jets, resetting screws etc I noticed that at some point I lost the left cylinder. I swapped the plug wires to see if the problem followed but it kept to the left. I pulled the plugs and the left was clean and wet (gas) and the right was black and sooty. Once a fresh plug is put back the cylinder comes back to life.
I have been thinking that up to now that it's soley been a carb tuning and timing problem , so I've read and re-read all the mikuni tuning info on this site and others and even picked up a Sudco manual. I understand the theory and procedures well enough (or so I think) and am starting to think that if it where only a carb issue i would have at least achieved a rough idle by now.
I'm hoping some one may provide some new train of thought on this or tell me to keep at 'er.
Apologies for being long winded here but I didn't want to leave anything out.