Question about 2001 Aprilia RS 125

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How do you adjust the air and pilot screw on A 1988 rm 250

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Hi Anonymous, I am sorry you can't find the first and best tool you ever bought for your Aprilia but despair not for a mere $10 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
Two Stroke Scooter ATV Carburetor Settings And Adjustments 1of4 Basics... https://www.tradebit.com/filesharing.php/search/0/1998+aprilia+rm+250

Posted on Oct 20, 2015

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Posted on Jan 02, 2017

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Hi, Rolandwhitfo and the usual suspects are:
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I need to know how many turvs on the air flow sqrue on a 1979 RM 80 it is all stock.


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1 Answer

When i crank on the gas sometimes it will bog out how do i fix that


If the hesitation is slight, a minor adjustment to the air screw will cure this problem - assuming your air filter is clean. If the bog is severe, then you will likely need to alter your pilot jet.

The air screw should be about 1.5-2 turns out from seat. If it is cranked in further than 1 turn to remove the hesitation, then bump your pilot jet up a size. If it cranked out more than 2.5 turns, then decrease your pilot jet size. One of the screws on the side is the idle speed and the other is the 'idle mixture' or air screw.

The needle is also in this mix but it's a fine tuning thing and since it is a bit tougher to get to, I usually get the above steps nailed down first then move to the needle to fine tune the mid range response - if needed. Ususally, you can get away without messing with the needle.

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change your plug and adjust your air screw brass flat head screw nere the air filter boot screw right (in) gently then turn (left) out 3 quarters of a turn try that then go a quarter of a turn at a time out till you find your sweet spot

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Yamaha TTR 250, Idling Problem


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