blip test

[bigbore2]

Does a hanging idle [2000 rpm] on the blip test mean its lean or too rich??

[Pat Conlon]

Lean
http://www.factorypro.com/tech_tuning_procedures/tuning_carbtune,cv,high_rpm_engines.html

[bigbore2]

thank you, Pat.  I go for a 40 pilot, then.

[Pat Conlon]

Yep, for hot summers, you want at least a #40 pilot. The USA FJ's were set lean (EPA) from the factory.

[bigbore2]

     I have a RUNNING BIKE.  thanx Pat.   This bike has been sitting for over a year cause after $350 spent on it to get it running and going completely thru the carbs,  I got a big fat "We dont know whats wrong with it"  
And another shop would fix it and power tune it for $600.

so I went thru the carbs with a magnifying glass and it was spotless.  I had the floats set wrong, again thanx Pat, read your advice on that and started over with a 37.5 pilot.

It started this morning at a 40 pilot 2 turns out.  It fired right up with a quick choke, and I shut off the choke. Blip test was perfect on cold carbs. but now its warm, its hard starting and a little not smoothness as I accelerate up to 2000 rpm.

Hanging idle is gone.

so I just need to adjust the air/fuel screw.  out or in?

[Pat Conlon]

 Blip test was perfect on cold carbs. but now its warm, its hard starting and a little not smoothness as I accelerate up to 2000 rpm.

Basic's first: Are the carbs sync'ed?
If no, sync the carbs. If yes, then look at installing some fresh float needle seat o rings.
It is common for these o rings to dry out a lose their seal on carbs that have been sitting for years. Your float heights may be set correctly but if these o rings leak you can still have fuel level issues in the carb bowls. Use some clear plastic tubing and check your fuel levels.

[bigbore2]

carbs rebuilt 3 yrs ago. by me.  put 16,000 mi on them, no issues until I got some UniPods from Randy and started reading here on this site. And twiddling where I had little experience.  but this is how we learn.

carbs synched a year and a half ago, but I will do that again.   40 pilot 2 turns out is pretty close. just need to dial it in a little, but it starts and RUNS.
I got the 2 outside carb float levels at 23mm, the 2 inside are supposed to be also, but I need to get a float tool for this.
Owe you a couple beers.  or shots of good tequila.

[bigbore2]

our non-adjustable carb is #4 cylinder?

[Pat Conlon]

IIRC Randy mentioned that it was #3...

Balance #1 to #2 (left screw)....then balance #3 to #4 (right screw) .....Finally balance the 2 pairs together (center screw) #1/2 balance with #3/4.

Work quickly. You can over heat the engine by letting it idle too long. If in doubt, a box fan can help.

[bigbore2]

great, will do.

[bigbore2]

MotionPro has an outstanding video on carb balancing. Mine were pretty close to good. So today was the shakedown run.  Bike started, ran in town and highway, idled, and did everything I needed it to do.

Thanx again for the help.  

[Pat Conlon]