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Old 02-22-2017, 12:13 PM   #1
padly1995   padly1995 is offline
 
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Aprilia am6 bogging

Hello,
I downgraded my 2002 Aprilia (AM6 engine) from 80cc to 50cc. I have Dellorto PHBG 19mm carburator, polini free flow air filter, malossi intake manifold and aftermarket reeds remus exhaust with akrapovic muffler.
(Previous owner fitted all of those parts so I`m not sure about reeds type and intake manifolds size).
So I fitted 50cc piston and cylinder. (I kept old 80cc head, because it didn`t came with the kit. I called the seller and ask him "How can you sell kit without a head and if I can use the one from 80cc kit", he said that I can).
Now it boggs really hard. You can`t even ride it. In neutral if I manage to get to high revs by adding little big of trottle flames start to shoot from exhaust.
Spark plug is wet.
I tried jets from 50 to 72. I have also changed pilot jet (can`t remember the size right now, but I can check tommorow).
I tried without air filter and also taping down air filter, but no luck.
If I add little bit of throttle I can get to high revs, but if I add more than just a little it boggs down instantly like "booooooooo".
It idles fine, there is just a little of difference between choke off and on.
If i try to ride as soon as I release the clutch it boggs.

Did anyone ever had 19mm carb on 50cc am6 and what jet size did you use?
What could be wrong?


Thank you



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Last edited by padly1995; 02-22-2017 at 12:44 PM. Reason: added video
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Old 02-22-2017, 08:25 PM   #2
wheelbender6   wheelbender6 is offline
 
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Float is stuck or set too high, possibly?
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Old 02-23-2017, 12:52 PM   #3
padly1995   padly1995 is offline
 
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Quote:
Originally Posted by wheelbender6 View Post
Float is stuck or set too high, possibly?
Hello,
Now I installed #98 main jet, idle jet is #50. I moved clip on needle on second notch from top to bottom, if I move it to top notch it starts cutting in midrange, if I move it lower, it starts to bogg more. It tooked bushing out of air filter, leaving just metal screen in there.
Now I can ride at flat, but still can`t climb hill. Take of is much better, it bogs to about 7k RPM.
I installed funnel made of metal screen in air filter and I noticed little change in low/mid RPM`S, but big change at high RPM`S, where it goes alot better. However in takes alot to get above 8k RPM in 4th gear and it`s cutting of a little in 1st gear sometimes...
Im going nuts with this moped.
Could this be too big idle jet?



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Old 02-25-2017, 02:05 PM   #4
padly1995   padly1995 is offline
 
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It was bogging because of bigger head, it goes ok now.
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