Spearfishing with Aquascooter as600

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Hi guys , first of all i am a new guy in this forum, and sorry for bad english.

I had an aquascooter two months ago but its a old one. As i see, its an arkos made and as600 model (written on the top of item )
I had encountered some problems. Try to solve myself but its look like take my time. So here is the problem , its working fine outside of the water. But put in the sea, things change. i put some accelerator while working its becoming clogged (maybe less fuel ) and stopped. If i not insist on accelerator and pull my finger back it revealed and slowly down to idle speed. If i accelerate slowly some times working great at full speed but a minute only. Then it makes back and forth movement and its very hard to control. Just a matter of small time after then stops. If i release the accelerator slowly, it back to idle speed. Working idle speed with no problem so far.
I have a second issue also. I use aquascooter at sea level. If i try to use at beneath my body, it stops. It stops but major part of the snorkel still above the sea level. Just dipping aquascooter to 20 cm could stop it. Why ?

I am investigating and find something can help. But really don't know can i handle. I am getting suspicious about carburetor may have residue twostroke oil have been sticked already to the fuel needle or diaphragms. I red something about in service manual it happens long time storage with fuel in carburetor. Gas become vaporized and residue oil sticks and clogged the needle.

My intention is dismantle the carburetor find the needle and cleaned it. If anyone who encountered this problem before and give some advice, it surely been welcomed. Thanks

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