Shandy24

Hi all new to the forum and got myself a zenoah 29cc marine, tuned exhaust and mounting kit with 600ml fuel tank to start.

I have the engine mounted on a piece of plywood and tank with cooling setup from head, to flange, to exhaust cooling jacket. I hhav been cooling it using a 12volt pump and 15 litre container of water.

Fuel I have been mixing a 20:1 mix as specified by zenoah and manual included saying 20:1 for 15 hours break in then 25-30:1 after.

I started the engine yesterday and after a few pulls started then cut out, I continued to start it with it running longer and longer each start with choke fully open and on idle with throttle a little jigging here and there to get it going.

I did have a little issue where my round fuel tank rolled over and starved the engine of fuel once but no other problems.

Today I started it in the morning and ran at idle for 1 minute before I had to turn it off because family arrived, when i returned to start it back up it will now no longer stay started on idle i have to keep giving the throttle a poke to keep it going.

I adjusted the idle screw to max and it still needs 0.2mm worth of throttle atleast but still doesn't seems confident running idle all carb high and low speed needles are as they came out the box
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Any suggestions on what I should try?

Regards, Chris.

crapshooter

Firstly re check both the High and Low needles incase the vibration caused a needle to close or open too much. to do this screw in one needle at a time until it won,t go in any further [ not tight ] then slowly reverse the direction [ anti clockwise ] until you have the required needle setting for the needle you have adjusted ie; high or low needle.

Ron Olson

My Feedback: (1)

Try 2 turns out on the low-speed needle then 1 turn out on the high. That's a good all-around setting and rarely will you move it from there. Once you mount the engine in the boat, toss that idle-speed needle as far away as you can as you can adjust everything else from the transmitter.

danielplace

You would need t know the carb number. A 1048 doesn't tune anything close to a 257.