johnfly

did you set the little tang for the fuel pump when you put the new kit in the carb ??? sounds like it's not letting enough fuel in to handle full bore! just a thought.

w8ye

My Feedback: (16)

I have found filter fuzz all over the filter screen between the pump and regulator inside the carb when the engine ran lean at high speed.

Big Windy

I have used the fully charged LiIon packs, and then two separate 4 cell NMH packs with no change. I plugged the NMH directly into the cdi input to eliminate any any system interference issues. Ithink I have checked the voltage issues and 2 different CDIs.

I will go check the fuel supply issues, I have not done that yet,

Thanks for the thought!

Big Windy

John, not sure what you mean about setting the little tang. There appear to be two vacumn holes on either side of the base plate. Looks like it woud be the same effect regardless of mounting orientation. Is there something else I need to look at or adjust in the conversion?

I agree it acts like a fuel restriction, but the carb is loaded when I open the plate.

w8ye

My Feedback: (16)

You might want to check the operation of your reeds?

Big Windy

How do you check the reeds?

johnfly

The little "tang" opens the fuel valve into the pressure side of the carb... if the diaphragm is barely opening the valve then there will be too little fuel in the carb to support full throttle ! Try bending that tang away from the carb body about a thirty second of an inch. that will increase the pressure of fuel in the carb. The tang is under the 4 screws. under the rubber diaphram.

Big Windy

Ok, I just replaced the Tang with another complete overhaul and this one does look as if it pulls the valve open more than the previous unit. I will try this and if still limited do as you suggested. I think this may well be the problem as it seems to pool fuel on the other side, and clearly sounds like it cannot get mail fuel for high rpm.

Thanks for the thoughts!

Big Windy

Ok problem finally solved!

It turned out to be the tang under the diaphragm was not lifting the needle enough to allow high fuel flow. I overhauled the carb again with a K20 WAT kit and replaced the needle and I could see a much better lift than the previous needle.

Now running a 19X8 Carbon prop I am getting 7,000 RPM high, 1600 Idle and easy starting. I set the timing to 30 BTDC. Everything else is the same.

Thanks to all that contributed and responded!!!

Big Windy

Johnfly, special thanks, it looks like you were right on! Problem now solved in time for the weekend!

Many thanks again!!

johnfly

Glad I could help.