Vader stalls when pushed

[4T_Goblin]

https://youtube.com/shorts/gr_BFBy-CtE?feature=share

I'm currently trying to tune a mikuni vm22 round slide.
Recently I botched an oil change by putting too much oil in. I have since corrected the amount of oil to 800ml.

That being said- I have changed the pilot to 15 from 35, kept the main jet at 100, adjusted the float bowl to ~21mm. I'm running a Venom Motorsports exhaust and Polini foam filter.

My main problem is I find it hard to tune the bike by riding it when it is able to stall out with a little push forward or backward. This weekend I'll time to get out on the street and investigate issues and see how it rides.

Has anyone had this problem? Could my engine be flooded? Seems like there's liquid pooling somewhere (other than float bowl) and sloshing when pushed.

Thanks all

[krat]

Why did you change the piolet to 15? All of these bikes need 30-40 idle jets!

You are simply starving it to death. the slightest shake stalls it. I am shocked that you can get it to start! The idle speed is also way too low. Go back to the 30 and turn the Air/fuel screw out about 2 turns and go from there.

The way we have to "tune" these carbs is a joke. Due to the placement of the adjustment screw you can not dial in fastest idle with the A/F screw, then dial in the throttle screw to proper setting like a normal carb.

The gas you hear "sloshing" is inside your half empty fuel tank. That is the only place where there is enough gas to "slosh" anywhere on that bike! It goes tank, fuel line, carb, engine with no detours to a puddle or container anywhere between.

[4T_Goblin]

I changed the pilot because the bike was running rich. Black spark plugs. The pilot was 35*. I went down to 15. It's idling basically the same.
I had the AF turned 2 turns out, same deal.
I read some reviews and comments describing the extra richness of the 30 pilot so I tried a smaller pilot. That is all.

It stalled with 35 pilot, it's stalling with 15 pilot.

I know what gas in the gas tank sounds like. I didn't say I heard the sloshing of gas. I said I think there's pooling happening somewhere, dumping on the plug? but I can't be sure, I do not know.

Still looking for answers or places to check.

Thanks all

[JerryHawk250]

Check that your float is not set too high.

[4T_Goblin]

It was stock set at ~26mm, I set it to 21mm. Had the issue both times. I can try going higher to 30mm

[TominMO]

Reset everything back to stock.
Watch a few motorcycle carb jetting vids on Youtube.
Get a range of pilot and main jets, both larger and smaller, and experiment from there.
Go up or down one increment at a time. Dropping from 35 to 15 is drastic; not the way to tune properly.
If anything, you could assume as a starting point that the bike is jetted lean from the factory, due to having to meet emissions standards.

[david3921]

Originally Posted by 4T_Goblin

It was stock set at ~26mm, I set it to 21mm. Had the issue both times. I can try going higher to 30mm

From a post from Weldangrind:

"I would set the float level with the carb upside down and no pressure on the floats (other than gravity). The plastic parting line in the middle of the float should be parallel to the gasket surface.

I've had good luck setting them with this process. Thanks again Weldangrind wherever you are!

Thread with above quote. Lots of good carb info;

http://chinariders.net/showthread.ph...ng+float+level

[Falkon45]

check your coil, spark plug wire, and any electrical plug that is connected to ignition. I have a feeling something electrical is loose, and it's not your carb.

[4T_Goblin]

Originally Posted by Falkon45

check your coil, spark plug wire, and any electrical plug that is connected to ignition. I have a feeling something electrical is loose, and it's not your carb.

I'll look at that too.

I may have blown a seal when I did the first oil change

[TominMO]

Is the needle set too high?

[4T_Goblin]

Originally Posted by TominMO

Is the needle set too high?

It is in the middle position.

[4T_Goblin]

https://youtube.com/shorts/jxtmr5uc-8A?feature=share

Here is the latest

I could not find the jetting that worked. No matter how I jetted it, pilot lean or pilot rich. Float bowl 21mm and 26mm. Needle from 3rd to 5th position.
It always searching for idle. Couldn't even ride it, I looked for air leak, nothing.
What gaskets are good for the 26mn intake and vm22 carb? Might try new gasket when I go back to it.

I had the bike shooting flames at one point.
Just could not get it to be smooth. Trying again next weekend.

[JerryHawk250]

Did you ever adjust the valves? Tight valves will make it damn near impossible to tune.

[4T_Goblin]

I have not looked at the valves because the problems with the bike were introduced by me. I wanted to change carbs to match the exhaust I put on. It was running great until I changed carbs. It's my fault.

But that being said, while the carb is off, now would be a good time to do that. I think I'll go for .003" intake and .004" exhaust.

Jerry I think you are right about the float valve. I saw oil in my spark threads, new plugs coming out black. That made me think I'm rich.
White smoke and high revs make me feel lean.

I'm just confused by getting both conditions- could be gas leaking in through valve as you said, making it appear rich.

I believe I had my best results with a 35 pilot (back to richened mix) and float bowl at 26mm. No matter what I did with the idle screw I couldn't get the bike to not search for 5k rpms. Messing with the AF screw landed me minute changes but nothing could cease the up and down. Like the float bowl is constantly raising abs lowering?

I put on a plastic spacer between the carb and intake, can't tell if that added air leak, or if it was better metal to metal. Lots of things changing, I know I need to simplify it .

I'm going to lower the float bowl again, to around 30mm see if that helps me.

[dirtbkr188]

Can you post a few closeup pics of the carb, if you don't mind?