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Motorcycle V-Twin CV carbs riding poorly on 1/4-3/4 throttle after carb rebuild

Motor Vehicle Maintenance & Repair Asked by Aus on February 26, 2021

Background:

The bike Suzuki Intruder VS1400 model 2000, ran fantastic, but started to stall on idle when I used old fuel in it.

What I did:

I cleaned the two CV carbs. Didn’t replace anything.

I found the floats too high, I adjusted them according to factory specs, about 2mm lower.

Resynchronized the idle and throttle using Carbtune from Morgan.

Adjusted the pilot screw using Colortune from Morgan also.

Symptoms now:

  • Idle runs great.
  • Little hesitant when snapping the throttle on neutral.
  • Under load, 2 gear and above, 1/4-3/4 throttle:
    • Hesitates
    • No power
    • Pops on acceleration
    • Heats up more than usual.
    • Gear rattles
  • On WOT, it picks up power after one second in WOT, but not as strong as before.
  • Spark plugs are yellowish but clean and dry. No signs of melting. but I didn’t ride the bike other than 500 meters test drives.
  • I sprayed starter spray on the intake boots, no rpm difference, no intake leak as far as I can tell.

More information:

  • I can’t tell which carb pops because both exhausts are on the same side.
  • The diaphrams are in good shape, I can lift the slide by blowing into the carb intake ventury, and it goes down normally, with some suction sound. which I believe to be good.
  • I cleaned it with brake cleaner and compressed air, it was already clean, no plugged holes anywhere.
  • I’ve repeated the procedure another time in case I missed a step, but no change.

Any ideas what could be wrong?

One Answer

The symptoms you describe (hesitant, low power, running hot) point to a lean condition. It sounds like you may have set the floats too low, I'd set the floats back to where they were and see if that improves the situation.

Answered by GdD on February 26, 2021

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