idle / idling down issue

[flips]

Thanks for the info Randy

Cheers

Jeff P

[Toy4Bob]

All right guys, here is the follow-up.

Finally bought a carb pro sync, and the kid came home from school.  We did the sync tonight, was pretty darn easy and I will have no trouble doing it myself in the future.  And the best part is it did fix the idle down issue!

Next is to try to fix the delay / slight lag when first give the throttle a twist.  If I don't give throttle a blip prior to actually throttling to take of from a stop, I have killed it.

[wakdady]

SURPRISE!!!!

Mine is doing this too! Fatter than elephant shit at idle. And it'll only idle below 1k or above 2k. Really lopey too. I was hoping a Carb sync, new uni pods and a 120 main would fix it. Nope. I just did the valves too. Also, I read that the uni pods made the intake louder, but I'm hearing a clacking sounds when I romp on it, wtf is that? 120 miles to the tank is no good either.

I'm gonna take another stab at it right now. Use the color tune for the mixture, resync and try resetting the idle. The carbs were rebuilt 8k miles ago, I sure hope nothings sticking or plugged in there.

[racerrad8]

SURPRISE!!!!

Mine is doing this too! Fatter than elephant shit at idle. And it'll only idle below 1k or above 2k. Really lopey too. I was hoping a Carb sync, new uni pods and a 120 main would fix it. Nope. I just did the valves too. Also, I read that the uni pods made the intake louder, but I'm hearing a clacking sound

s when I romp on it, wtf is that? 120 miles to the tank is no good either.

I'm gonna take another stab at it right now. Use the color tune for the mixture, resync and try resetting the idle. The carbs were rebuilt 8k miles ago, I sure hope nothings sticking or plugged in there.

Henry,

Sounds like a trip to Oakdale on Saturday afternoon

Randy -  RPM

[wakdady]

Here's the scoop. Cylinder 1 is rich no matter what I do. I couldn't get the blue flame regardless. The plug was completely black, covered with oil or fuel. It may be a plugged pilot, or something in the Carb. The diaphragm is good as new and slides correctly, the needle is also in great shape.
Not really sure where to go next. I would blame the rings and blow by but that doesn't explain the rich scenario.

[Mike Ramos]

Yes, a trip to Oakdale will cure any & all malfunctions...
Not to mention it will eliminate a lot of potential future problems as the gentleman from RPM actually looks the bike over as he is performing the repair at hand.
I have found Randy to be not only well versed on theory, but he is able to put that theory [quite easily] into practice; very thoroughly and competently as well.
Ride safely,
Mike Ramos.

[SlowOldGuy]

Did you change the needle seat o-rings when you rebuilt the carbs?

Sounds like you have unmetered fuel sneaking into the intake.  Check the fuel level.

DavidR.

[andyb]

Or a leaking choke.

[wakdady]

If air were sneaking past, wouldn't it run leaner? With the diaphragm removed, looking at the choke slider, in the closed position its still open by very small amount, like half a millimeter.

[racerrad8]

So, will I see you tomorrow afternoon?

Randy - RPM

[andyb]

If air were sneaking past, wouldn't it run leaner? With the diaphragm removed, looking at the choke slider, in the closed position its still open by very small amount, like half a millimeter.

What david was suggesting was fuel sneaking past, not air.  Does sound like you've found the problem perhaps though.  Why do you have to remove the diaphram to see the choke slider, though?

[wakdady]

I've taken he entire Carb apart and I don't see anything out of place. Everything is nice and clean and free moving.
Should there be o rings in the needle and mixture screw? I don't have those, if so.

[racerrad8]

Yes, small o-ring 1x3 I believe along with small washer under the spring. You can see all the parts on my website. Search idle mixture screw.

Randy - RPM

[Pat Conlon]

Henry, I noticed that when I pulled my idle jet needles out, the spring and o ring washer came out with the needle, but the o rings thenselves were stuck on the seat way down in the carb bore. Very dark down there. I had to get a flashlight to see them.
I needed a angled pick to reach down there and get them unstuck and pulled out.

Cheers amigo! 

[wakdady]

Lol, looks like I never installed the orings with the new mixture screws! Been running it like that since I got the bike.

Now the needle. Does someone have a picture of how it all goes together? I feel there might be something missing there.

To sum up, running an exhaust, Randy's uni pods, 120 main, I should be at the second clip from the bottom on the needle, right?