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Christopher Moore

Miss Vegas runs great for 1 min then falls flat

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Like the title says. This is the case after a flip over. Start it runs great for about 1 min then act like its at half throttle. We have adjusted the mix all over the place and it still runs the same. I am hoping we did not kill this brand new motor (yes it had 8 tanks through it before this proper break in).

 

I am wondering if we got water in the crank case and it is boiling a min in and causing these issues. But maybe somebody has an Idea.

 

BTW this is a Super Tiger .18

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Cleared lines, box was tight no water in there. It ran 5-6 times after the blow over so I think it got nice and hot. Thinking it maybe a exhaust leak some where. Going to have to do a system pressure check I guess.

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we have been almost 1 turn in both directions. At first it gives the indication of lean/rich until it reaches that 1 min or less mark then back to the same old bog. no matter what the needle is set at. It was running perfect at 3.75 turns out before the blow over. Seems a bit rich but it was keeping up and sounded good like my Miss V.

 

Oh yah and we have used 2 new plugs so that's out also and they looked brand new so it was running perfect mix wise.

 

I think we have figured it out. Checked all the lines and what not and found the nipple on the exhaust backed out 1/4 turn allowing air to come out on the blow test (super professional) tightened up now. So it seems maybe the pipe gets heated up and allows pressure to escape faster after about 1 min of running.

 

Will see this weekend.

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Get rid of the stock tank and put a 8oz dubro in its place

 

 

i agree with dick on this one for sure.... could be the tank leaking pressure if its the stock one......

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It's brand new stock one. The last tank did leak but has been replaced. I told the owner to replace it with a 8 oz like mine but he wont listen and likes the flip lid. At this point its not the tank we did a 2 psi pressure test on it and no leaks.

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I would still replace that tank with an airplane style tank. You could have an internal leak in fuel pickup in tank. This will not show it's head until fuel level drops a little allowing carburetor to draw air bubbles. Bearings would be my next guess.

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Chris, I used to have one of these. If the above fails, what kind of pipe/exhaust connector do you have running from the end of the pipe to the exit of the back of the cowling or transom? Is it too small? is there a bend in the tube? I took mine off or went with a larger dia. tube and it stopped doing what you explained above.

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