not even sure why i'm posting... i've read pretty much every thread there is to read across vn750.com and the yahoo groups site about why our bikes won't idle. just frustrated. weather is nice... i want to ride... and i'm getting really sick of playing with my bike in the garage.
i took a nice ride this weekend... about 200 miles or so. bike runs great above 3000 rpm... under that i have to be really quick with the clutch and throttle to keep it running.
rebuilt the carbs a couple months ago... reinstalled... it just won't idle. problem is there are too many things which could be the problem... something i missed during the rebuild... vacuum leak... carbs out of sync... incorrect air/fuel screw adjustment... float valve stuck... weak battery... incorrect throttle cable adjustment... i've been through every one of them and just when i think i've made some progress i let the idle drop down below 2k and... dead... and it's back to the drawing board.
if you've made it this far... here are the latest symptoms: above 3000 rpm, the bike runs fine. the one issue i'd mention above 3000 rpm is slow deceleration. the engine winds down very slow when i pull the clutch lever in and drop the throttle and this makes shifting a bit awkward. if i drop below 3000 rpm... sometimes i can get the bike to idle around 2000 rpm... sometimes it just dies altogether. lately, it dies way more than it lives. if i CAN get it to idle for any period of time around 1500 - 2000 rpm, the moment i wind up the throttle (to say 5000 rpm or so), the idle will then STAY there... and i'll have to completely back off the idle screw to bring the idle down. i've double checked the throttle cables and have sprayed wd40 on the carb linkage... that part is smooth. there's something else going on.
my guess is that there's a vacuum leak, but i just tried spraying some wd40 around the boots and the engine didn't make a sound... so i guess that rules that out.
since the carb replacement, both cold and hot starting have been a bit of a problem... lots of cranking and eventually the engine catches. i've noticed popping from the rear cylinder at 2000 rpm and decel.
anyway... just some more ranting. honestly, i'm just sick of screwing around with this thing. there were some carbs from a 2004 bike on ebay a couple weeks ago... i should have bought them. i've learned a lot messing around with my bike, but at this point i'm thinking about just getting something newer. if i could find a local mechanic who'd be willing to work on my bike at a reasonable rate, i'd say go for it... but no one wants to screw around with a 91 bike with carb issues... there are just too many variables.
the thought of pulling these carbs and putting them back in again does not sit well with me... took me hours to manipulate these things both out and back in.
so... guess that's it. just needed to get this off my back. thanks if you made it this far.