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Thread: Trim pots........

  1. #1
    AMA Pit Boss andirsv's Avatar
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    Trim pots........

    Guys........can anyone tell me which adjuster on the ecu affects which exhaust? Setting co2 levels tomorrow. cheers

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    Quote Originally Posted by andirsv View Post
    Guys........can anyone tell me which adjuster on the ecu affects which exhaust? Setting co2 levels tomorrow. cheers
    Left = front, Right = rear

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    AMA Pit Boss andirsv's Avatar
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    Quote Originally Posted by Spoonz View Post
    Left = front, Right = rear
    Brilliant Col, thanks bud.......is that as you sit on the bike mate??

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    Quote Originally Posted by andirsv View Post
    Brilliant Col, thanks bud.......is that as you sit on the bike mate??
    Yep as if you were sitting on it

    As you look at them looking back from the front of the bike the rear cylinder is the trim pot nearest the ecu connectors.

    Keep the engine temp below 93 degrees as the ecu richens the mixture to aid cooling at that temp and it will mess up the reading. I feed a fan into the rad and stop adjusting if the rad fans kick in.
    Last edited by Spoonz; January 29th, 2012 at 10:48 AM.

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    AMA Pit Boss andirsv's Avatar
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    Quote Originally Posted by Spoonz View Post
    Yep as if you were sitting on it

    As you look at them looking back from the front of the bike the rear cylinder is the trim pot nearest the ecu connectors.

    Keep the engine temp below 93 degrees as the ecu richens the mixture to aid cooling at that temp and it will mess up the reading. I feed a fan into the rad and stop adjusting if the rad fans kick in.
    Brilliant Colin, thanks for tips!! I'll set the fan up in front before I start.......top man

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    Sorry to hijack your thread Andi, but I gotta do the same on mine tomorrow to bring down the idle speed.
    Which way do I turn the adjusters to do that?

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    AMA Pit Boss andirsv's Avatar
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    Quote Originally Posted by estranged View Post
    Sorry to hijack your thread Andi, but I gotta do the same on mine tomorrow to bring down the idle speed.
    Which way do I turn the adjusters to do that?
    Start with the idle adjustment screw wound not fully bud. Have you vacuum guages and co2 reader? Once fully warmed bud, check the levels and if needed turning the air/fuel screw clockwise decreases revs but will alter the mixture so a fair bit of tweaking is needed to get all spot on! Took me about an hour to get 3.5% front and 4%rear with the correct vacuum cv the throttle bodies!

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    Quote Originally Posted by andirsv View Post
    Start with the idle adjustment screw wound not fully bud. Have you vacuum guages and co2 reader? Once fully warmed bud, check the levels and if needed turning the air/fuel screw clockwise decreases revs but will alter the mixture so a fair bit of tweaking is needed to get all spot on! Took me about an hour to get 3.5% front and 4%rear with the correct vacuum cv the throttle bodies!
    I don't understand a word of that!
    Closest I have to any of that is a vacum cleaner, it's a Dyson though, will that do? :p
    Heard about the idle adjustment screw. gonna go have a look and see if I can find it.

  9. #9
    AMA Pit Boss andirsv's Avatar
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    Quote Originally Posted by estranged View Post
    I don't understand a word of that!
    Closest I have to any of that is a vacum cleaner, it's a Dyson though, will that do? :p
    Heard about the idle adjustment screw. gonna go have a look and see if I can find it.
    Ha!! The idle adjustment screw is on the right hand side, just below the fuel tank, and connects to the throttle bodies bud. If the bike is just idling slightly high, turn it (once warmed up fully) anti-clockwise to reduce the speed. Let it settle and blip the the throttle a couple of times and see where it sits then. Best to take it for a run to check but the roads are still crap bud. The rest of the reply is based around adjusting the co2 and vacuum settings on the throttle bodies bud, so you don't need to worry about that, my mistake bud!!!

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    Quote Originally Posted by andirsv View Post
    Ha!! The idle adjustment screw is on the right hand side, just below the fuel tank, and connects to the throttle bodies bud. If the bike is just idling slightly high, turn it (once warmed up fully) anti-clockwise to reduce the speed. Let it settle and blip the the throttle a couple of times and see where it sits then. Best to take it for a run to check but the roads are still crap bud. The rest of the reply is based around adjusting the co2 and vacuum settings on the throttle bodies bud, so you don't need to worry about that, my mistake bud!!!
    thanks for the help. Sorted the idle speed via the screw. Didn't know they changed it to a knob that attatches to a lil bracket on the frame, was wondering what that bracket was for on the new frame.
    Must remember though, next time I take the bike apart to re-attatch the fuel return pipe when I run the bike. Was wondering where the petrol was coming from...

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    Can anybody tell me what the correct adjustment for the trim pots on the ecu is and also i have a A63KAT chip installed is that a gud chip

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    AMA Pit Boss redratbike's Avatar
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    Quote Originally Posted by chrisneru2 View Post
    Can anybody tell me what the correct adjustment for the trim pots on the ecu is and also i have a A63KAT chip installed is that a gud chip
    Vary from bike to bike

    Read this

    Try Gabros baselines from http://www.apriliaforum.com/forums/s...ke-with-an-EGA
    "set the bypass brass screws (TB's left side):
    -> 51mm ad 54/57mm TB's generally needs different air bypass set-up: so try rear screw to one turn out from closed, front screw 1.5 turns out fronm fully closed for the bigger TB's, 2 turns out rear and 2.5 turns out front for the 51mm tb's.
    Anyway that's only a base point. If the bike can't idle with the screws so closed, try openup 'em more. Try to keep the motor un-balanced with the front cylinder stronger than the rear.
    7) set the ECU trimpots both to zero position at 12 o'clock (the one near the ECU connectors is for the rear cylinder). Try to run the pots around that position, if you have to go far away on the rich or on the lean side maybe there's a problem elsewere."

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    Quote Originally Posted by redratbike View Post
    Vary from bike to bike

    Read this

    Try Gabros baselines from http://www.apriliaforum.com/forums/s...ke-with-an-EGA
    "set the bypass brass screws (TB's left side):
    -> 51mm ad 54/57mm TB's generally needs different air bypass set-up: so try rear screw to one turn out from closed, front screw 1.5 turns out fronm fully closed for the bigger TB's, 2 turns out rear and 2.5 turns out front for the 51mm tb's.
    Anyway that's only a base point. If the bike can't idle with the screws so closed, try openup 'em more. Try to keep the motor un-balanced with the front cylinder stronger than the rear.
    7) set the ECU trimpots both to zero position at 12 o'clock (the one near the ECU connectors is for the rear cylinder). Try to run the pots around that position, if you have to go far away on the rich or on the lean side maybe there's a problem elsewere."
    Thanks bro will try those settings and see how it goes cheers

  14. #14
    One Liter Duc Eater RSV_Ecosse's Avatar
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    The A63 is the standard EPROM in bikes from 1998-2000 - the small valve engined ones. The 'KAT' part is supposedly in reference to 'katalyser' which I can only guess was fitted to bikes for certain parts of the world due to emission legislation.

    The bad news is that the trim pots are not enabled on a bike with an A63 EPROM. You could fit an RP58 chip from a 2001 onwards bike as they enable the trim pots. Or go for a Forza, Gabro or Doctor Rossi aftermarket chip.

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    Baby Twin
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    Quote Originally Posted by RSV_Ecosse View Post
    The A63 is the standard EPROM in bikes from 1998-2000 - the small valve engined ones. The 'KAT' part is supposedly in reference to 'katalyser' which I can only guess was fitted to bikes for certain parts of the world due to emission legislation.

    The bad news is that the trim pots are not enabled on a bike with an A63 EPROM. You could fit an RP58 chip from a 2001 onwards bike as they enable the trim pots. Or go for a Forza, Gabro or Doctor Rossi aftermarket chip.
    Cool thanks man for the info.

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    Have jst checked spark plugs found
    Front cylinder running rich. Plugs are black. Rear cylinder looks normal. Any idea wat I need to adjust

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    AMA Pit Boss redratbike's Avatar
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    Quote Originally Posted by chrisneru2 View Post
    Have jst checked spark plugs found
    Front cylinder running rich. Plugs are black. Rear cylinder looks normal. Any idea wat I need to adjust
    ideally you neeed the co levels and tb throttles balanced get it done by someone who knows what they are doing and has experience of the rotax lump

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    Quote Originally Posted by Spoonz View Post
    Left = front, Right = rear
    Hey man my front runs quite rich jst by looking at the sparkplug it looks carbon fouled, black wud adjusting the trim pots fix it and which way do I turn. Clockwise or anticlockwise

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    Quote Originally Posted by Spoonz View Post
    Yep as if you were sitting on it

    As you look at them looking back from the front of the bike the rear cylinder is the trim pot nearest the ecu connectors.

    Keep the engine temp below 93 degrees as the ecu richens the mixture to aid cooling at that temp and it will mess up the reading. I feed a fan into the rad and stop adjusting if the rad fans kick in.
    To lean out the mix on the front which way do I turn dial. Clockwise or anticlockwise

  20. #20
    AMA Pit Boss redratbike's Avatar
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    But your trim pots are disabled

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