subt3rra
SUBT3RRA
Hey guys
I am waiting on a clutch push rod seal to fix a leak, and while waiting I decided to sync the carbs now that my pipes are all welded up.
Well I bench sync'd, reinstalled and fired her up. She ran, but kinda rough. Tweaked the mixture a bit more and things were about normal that day. I didn't have time to take it out for a long test and had to work the next day. Don’t have a manometer, so that’s as close as I could get it. Mind you, it ran fine prior to all this...
Rode it to work the next day, and here’s basically what happens: starts first kick like always (yea!), runs good for 5 minutes. Then Right cylinder wont fire or intermittently fires, then when a bit warmer runs good. A few miles more, then back fire (technically after fire, in the pipes), and random right cylinder will ” fire – no fire” . Feels like it’s not getting enough gas...
So this weekend I checked plugs – left is looking good, right is looking lean. So I pull the carbs. Back story, I rejetted when I redid the pipes from stock 135 to 140, ran good until I got the pipes final welded (yes I had to run it ghetto for a bit). So up to this point I am running 140 mains. At first I thought of raising the needles, but surprise! Mine are not adjustable.
So I went up to 142.5 mains. Put ‘em in. Fired up, ran basically the same except less backfire (after fire). But same routine... runs, then no right cylinder, then runs (really well with new jets) then runs bad, some backfire. New twist now, it will NOT START first kick when warm, and sometimes takes 10 kicks or so, but eventually fires... checked plugs again last night: left looks great, right looks lean, same as before... on mixture I am 1 3/4 turns left and 2 turns right... I had right out to 3 turns while setting but really ran bad that far out so back down to 2.
Sorry for the long back-story. So I am now thinking it is either I need to sync my carbs with a manometer, but that doesn’t explain the randomness of things...
Or my right coil is bad – checked them last weekend tho. Using the red and orange leads in the plug they both test 3.4 and 3.3 ohms ea, within spec. Tested resistance in my plug wires. They are slightly different lengths, and about 11.9 and 9.9 ohms (lower number is the right). I do not know what they should be, but a new untrimmed plug wire was reading about 12 ohms...
Or I have a clogged jet, which I guess I could, even though I cleaned the carbs and ride it DAILY (it’s all I have). But it seems like that would be clogged or be unclogged and that’s that...
Or...? stuck or sticking valve? I don’t know...
Timing is factory, haven’t touched it.
I am running stock air cleaners, could that be it? Seems possible, but long shot maybe...
The left cylinder runs fine and has for the whole time
Open to suggestions... thanks
I am waiting on a clutch push rod seal to fix a leak, and while waiting I decided to sync the carbs now that my pipes are all welded up.
Well I bench sync'd, reinstalled and fired her up. She ran, but kinda rough. Tweaked the mixture a bit more and things were about normal that day. I didn't have time to take it out for a long test and had to work the next day. Don’t have a manometer, so that’s as close as I could get it. Mind you, it ran fine prior to all this...
Rode it to work the next day, and here’s basically what happens: starts first kick like always (yea!), runs good for 5 minutes. Then Right cylinder wont fire or intermittently fires, then when a bit warmer runs good. A few miles more, then back fire (technically after fire, in the pipes), and random right cylinder will ” fire – no fire” . Feels like it’s not getting enough gas...
So this weekend I checked plugs – left is looking good, right is looking lean. So I pull the carbs. Back story, I rejetted when I redid the pipes from stock 135 to 140, ran good until I got the pipes final welded (yes I had to run it ghetto for a bit). So up to this point I am running 140 mains. At first I thought of raising the needles, but surprise! Mine are not adjustable.
So I went up to 142.5 mains. Put ‘em in. Fired up, ran basically the same except less backfire (after fire). But same routine... runs, then no right cylinder, then runs (really well with new jets) then runs bad, some backfire. New twist now, it will NOT START first kick when warm, and sometimes takes 10 kicks or so, but eventually fires... checked plugs again last night: left looks great, right looks lean, same as before... on mixture I am 1 3/4 turns left and 2 turns right... I had right out to 3 turns while setting but really ran bad that far out so back down to 2.
Sorry for the long back-story. So I am now thinking it is either I need to sync my carbs with a manometer, but that doesn’t explain the randomness of things...
Or my right coil is bad – checked them last weekend tho. Using the red and orange leads in the plug they both test 3.4 and 3.3 ohms ea, within spec. Tested resistance in my plug wires. They are slightly different lengths, and about 11.9 and 9.9 ohms (lower number is the right). I do not know what they should be, but a new untrimmed plug wire was reading about 12 ohms...
Or I have a clogged jet, which I guess I could, even though I cleaned the carbs and ride it DAILY (it’s all I have). But it seems like that would be clogged or be unclogged and that’s that...
Or...? stuck or sticking valve? I don’t know...
Timing is factory, haven’t touched it.
I am running stock air cleaners, could that be it? Seems possible, but long shot maybe...
The left cylinder runs fine and has for the whole time
Open to suggestions... thanks