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Author Topic: turbocharged cb550 bobber  (Read 36520 times)

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #70 on: Jan 17, 2016, 17:14:14 »
My smaller pilot jets arrived, and I tried them out today. took out the 17.5 and put in the 15 and then 12.5. 12.5 is still too rich at idle, I cannot make it stall out with the fuel screw turned in. JETSRUS only lists one pilot jet smaller than a 12.5, and thats a 10. Really hoping the 10 gets me where I need to be. Would there be any other problem causing my pilot circuit to seem so rich?

worked on a couple other small things. I added a rubber hanger mount to the turbo to give it some support. This rubber mount is from a 2 stroke dirtbike exhaust pipe. So now this project has snowmobile, car, tractor, and dirtbike parts being put to use!

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: turbocharged cb550 bobber
« Reply #71 on: Jan 17, 2016, 17:19:50 »
If you cant make it stall with the fuel screw turned in you are probably idling on the main.
burning bridges sometimes light the most productive paths

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: turbocharged cb550 bobber
« Reply #72 on: Jan 17, 2016, 17:22:46 »
and by probably i mean definitely
burning bridges sometimes light the most productive paths

Offline Sonreir

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Re: turbocharged cb550 bobber
« Reply #73 on: Jan 17, 2016, 17:35:56 »
If you cant make it stall with the fuel screw turned in you are probably idling on the main.

+1

If the pilot jets aren't having much/any effect, then they're not being used.

What RPM are you idling at?
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Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #74 on: Jan 17, 2016, 18:10:25 »
probably idling between 1500 and 2000. Whats making this thing idle off the main and how can I fix it? Drop the needle lower?

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: turbocharged cb550 bobber
« Reply #75 on: Jan 17, 2016, 18:11:05 »
probably idling between 1500 and 2000. Whats making this thing idle off the main and how can I fix it? Drop the needle lower?
Clean the carb

then go back to bigger pilots that can actually feed it enough fuel to idle off of
burning bridges sometimes light the most productive paths

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: turbocharged cb550 bobber
« Reply #76 on: Jan 17, 2016, 18:15:50 »
you'll know when you have the carb clean and the pilot size close when you can turn the idle down to 800rpm and it is smooth

1500 and 2000 is a big range. Lemme guess, the slightest idle adjustment makes huge swings in rpm

yep clean the carb and get some fatter pilots in there
burning bridges sometimes light the most productive paths

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #77 on: Jan 17, 2016, 18:16:37 »
will do. So is it possible even my 17.5 pilot was too small, and this was forcing it to idle off the main? Carb appears to be clean, but I'll admit I have not gone through it thoroughly. Any good guesses on sizes of pilots to order? they offer sizes from 10-140
« Last Edit: Jan 17, 2016, 18:20:25 by mswans »

Offline DohcBikes

  • Posts: 2384
  • Fuck You.
Re: turbocharged cb550 bobber
« Reply #78 on: Jan 17, 2016, 18:20:21 »
single 17.5 jet running 4 cylinders yep i'd say she's a bit lean on the pilot sir. From what i see there's gonna have to be some major changes to your fueling system or you're gonna blow that thing up right away. Running lean on forced air is not a good thing
« Last Edit: Jan 17, 2016, 18:22:12 by DohcBikes »
burning bridges sometimes light the most productive paths

Offline mswans

  • Posts: 49
Re: turbocharged cb550 bobber
« Reply #79 on: Jan 17, 2016, 18:26:08 »
I'm all ears on suggestions here. Im understanding now that my pilot is so lean, I had to have the idle screw cranked up to the midrange to get it to "idle". It did sound fairly smooth, but just falls on its face and dies if i turn the idle screw any lower than 1500 or so. Plugs currently look quite rich, but I know this isn't the most accurate indicator of a rich/lean condition.