Shortskimpre

Does anyone happen to have documentation on the TPS and how to properly set/tune it? Can't find too much on it and my check engine light is on. I had to remove it and set it by eyeball which CLEARLY wasn't close enough!

You're all not going to believe this. The air vent hoses on the top that equalize pressure on the top of the carbs were completely clogged with mouse feces where they "plug" in to the motorcycle. I unclogged that. The carbs are running amazing gand this bike has officially moved down the street under its own power for the first time in 6-7 years! I'm so excited!

Well... I spoke too soon. Got home from work tonight and just for giggles wanted to make sure the carbs were holding out. Power cycled the key. The moment I turned the key over, fuel started spraying out of the top of the carbs again. Time to take them off for a fourth time... When I checked them last night. There was a very small amount of sediment in them. Starting to feel like it's hopeless...

Thanks so much Puc! I tore them apart again last night. I tightened up the primary holders (They might have been too loose?) and pulled the seats out and recleaned everything in the bowl. A small amount of sediment (I'm thinking at this point, it may be the old fuel pump that keeps releasing it in to the line) was found inside the bowls. I bored out out (with some green scotchbrite) where the needle seat o-ring sits and put everything back together and tried it again. It has gone from a sky rocketing fuel overflow to just a weeping overflow out of the top of 2 of the carbs now. I think between those 2 items and a cleaning. I may be on the right path!

Also! The tank is extremely rusty and is currently getting professionally sealed and coated. Should have it back in a few days.

Hello puc! I have taken it apart twice as that is what I assumed as well. The third time I primed the fuel pump in to a gas can (to clear the lines of debris) and used a fresh canister of fuel. So I believe we can safely rule out debris. Although I do plan on taking it apart AGAIN to double check. And of course, before I put them back in the bike. I did the "blow in the fuel intake as hard as you can and operate the floats". They all passed that test. It's a 1999 Yamaha royal star tour classic. I'm not sure whether I have a vacuumed petcock. Would you know by chance? Could this be a symptom of a TPS set incorrectly? I just used witness marks to put that back on the carbs.

As the title says. I found this motorcycle. It had been sitting in the Tennessee sun for the last 6 years. I've rebuilt the entire clutch system (and cleared the clutch hoses, those are NOT fun to get to). Rebuilt the entire front braking system. Rebuilt the entire rear braking system. I've put a TON of work in to this thing. Now, for the problem: I've rebuilt the carbs. And when freshly putting them in and power cycling the first time. All is well. Bike fire up and idles smoothly! except. I turn the bike off and the next time i go to fire the bike up. The pump primes and BOOM. I get 4 jets of fuel that would be going right in to the airbox shooting a solid 12 inches above the carb bodies! I did the all balls rebuild kit. It has new needles, new seats. Basically new everything. Anyone have any ideas on what could be allowing the carbs to overflow that much and in that particular spot (the hole with the brass fitting closest to the top of the carbs). I'm kind of at a loss here. I can post video or photos if needed. I'm new here so i'll have to figure out how to do that! Thanks again!