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Joined: Nov 10, 2015 7:00:52 GMT -5
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Post by vitcox on Nov 10, 2015 7:55:59 GMT -5
Hi all, I`ve got a massive problem. When i start my moped, it start fine, runs fine on iddle but... when I turn throttle to half way, engine dies. New gear installed month ago: > New carb > New spark plug > New fuel filter > oil filter & oil Checked: 1. Vaccum line and petcock (vacum line is clear from blockages, when i suck up on vacum the gas is flowing) 2. I`ve opened the carb to check iddle jet and main jet (carb was new but i wanted to make sure it`s not the cause) During the inspection i noticed a lots of cracks on the intake manifold. Do You reckon, it may be a cause of my problems??  |
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Post by scooter on Nov 10, 2015 9:09:21 GMT -5
It could be. Try putting some tape or gasket goo over the cracks and see if your performance is any better. Any air leaks can cause fuel delivery problems, especially at higher RPM.
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Post by cyborg on Nov 10, 2015 9:55:40 GMT -5
theres your problem,,,air leak
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Post by lain on Nov 10, 2015 10:10:55 GMT -5
There's 0% chance that cracked manifold ISN't a problem, haha! You should replace the manifold and tune your carburetor, that air/fuel mix screw looks to be unscrewed pretty far, it should only need about 2 turns out. You probably unscrewed it that far to give the scooter enough gas to idle with that leak but far too much to run with.
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Post by JoeyBee on Nov 10, 2015 15:33:53 GMT -5
lain. Nice observation with the air fuel mixture screw. I didn't even notice that when I first viewed the picture. Looks like OP answered his own question.
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New Rider
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Joined: Nov 10, 2015 7:00:52 GMT -5
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Post by vitcox on Nov 11, 2015 7:47:56 GMT -5
Ok, a quick follow up -
Before I made photo, i did tryied to adjust A/F screew (hoping this helps).
Result had no major effect (as i had an air leak) but i noticed that engine responds in lower/higher RPMS.
I did taped it up and the engine did not started.
Then tuned-up A/F screew again and managed to start.
I can go bit higher in revs but still it goes off.
Moto start perfectly and idling ok.
Do I need to be super accurate with A/F screew??
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Post by scooter on Nov 11, 2015 11:42:17 GMT -5
Ok, a quick follow up - Before I made photo, i did tryied to adjust A/F screew (hoping this helps). Result had no major effect (as i had an air leak) but i noticed that engine responds in lower/higher RPMS. I did taped it up and the engine did not started. Then tuned-up A/F screew again and managed to start. I can go bit higher in revs but still it goes off. Moto start perfectly and idling ok. Do I need to be super accurate with A/F screew?? no. It's not that critical. |
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Post by lain on Nov 11, 2015 23:58:55 GMT -5
Ok, a quick follow up - Before I made photo, i did tryied to adjust A/F screew (hoping this helps). Result had no major effect (as i had an air leak) but i noticed that engine responds in lower/higher RPMS. I did taped it up and the engine did not started. Then tuned-up A/F screew again and managed to start. I can go bit higher in revs but still it goes off. Moto start perfectly and idling ok. Do I need to be super accurate with A/F screew?? That intake manifold is not salvageable, you're running your engine too lean and it will cause it to overheat and become seized and will require an engine rebuild. If you don't want to render your ride useless then replace the manifold, they are like $10 online. That's about 2 fill ups of gas, and since you can't ride I'm sure you can use that money to bring your ride back to working order. |
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