Hi all.
My 99 VF750 sat for too long, and engine started bogg down, stall, rough iddle, etc. Symptoms of a clogged low rpm jets. Went to see another Mootster South of Austin, with a re-jet kit, K&N filter, and ready to open her up.
Carbs were removed. Normal jets were clean, slow ones were clogged. Compressed air and carb cleaner took care of it. Found pieces of fowm from the little air filter next to the ignition key (not sure what that it...) inside some of the opennings, and cleaned that too.
Put it all together, but discovered we broke the Vacuum port on the front/R cylinder body, so had to wait till a new one arrived.
Funny thing #1. After re-jeting, we tested the vacuum ports on all 4 cylinders with the mercury column (which can be done without the broken nipple), and engine run fine. Shut her down. Trailered her home. 2 weeks later. Installed new bronze nipple, connected rubber hose, started bike....and it won't start. Sounded like low batery. Charger went bad. New battery, new charger. Tried to start her again and the engine was rough...louder on the left side of the exhaust pipes. Sputering a lot, all on the left side. Front leaft exhaust seemed not as hot as the gases from the other 3 cylinders. Throtle not returning to iddle if engine running. checked throutle cables and looked fine with engine off. Surging a little, rough, sputtering, etc....very bad sounds.
Decided to open her up again. removed gas tank. removed air filter. Removed black plastic cover of Left Rear cyl. Diafram was fine. pulled on the needle and it did not come. Came out with a screw (correct). Pushed needle back in, closed black cover.
Went to front left cylinder. repeated check. Needle came out with my fingers. Obviously not seated properly. Pushed it in till clicked. Tried engine again, same symptoms. What do you guys think? Haven't check rigth side cylinders yet.
You're over thinking it; it sounds to me like the idle jets are clogged again. Either some tiny pieces of trash got in the fuel lines and worked their way into the idle jets or the bike set long enough to allow the gas to gum up in the idle jets again. With the crappy additives the tree huggers are mandating in our gasoline now days, it only takes a few weeks of sitting to run into problems; if it's going to sit longer than a couple of weeks with out running, treat it with some stable.
Pull the carbs and clean the idle jets again and it will be good to go.
Yep slow speed jets are clogged, happens all the time. we have cleaned probably 100 of them or more LoL.
And sometimes it is best just to replace them lot less hassle than tearing carbs apart a million times !!!!
OK.. Everyone having fun Troubleshooting???
I'll Start
Hey aquasition - Welcome to MOOT from Tampa Bay, Floriduh!!!
Where are you located??? (I'm guessing in Texas as you went to Austin for help)
How long have you had the Magna??
Sure would like to see a picture or two..
What Mods do you have IF any??
You've already received some good advice, stick around, and you'll receive even more...
The foam filter breaking down is very common, good catch on ID'ing the source of the black foam bits..
Good luck with your carb cleaning!!!
Don't forget to run some SeaFoam in the tank!!!
right before I sold my bike those are the symptoms I had right before my rectifier died. left front not running correctly and hard to start slow start with a new battery that sat on the battery tender all winter. it finally quit and statted melting the three yellow alternator wires at the connector under the seat. replaced regulator with used one from ebay and worked just fine.