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  1. #81
    Co-Pilot oldbaldyman's Avatar
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    It is likely that the rubber 'offcut' is the OME item (they are a bodge to make the carb fit but I have seen some better than others). You have to be careful about the fitment of the 'reducer' as it can get pushed back too far/twisted/fall apart etc and it will bugger up the air flow/mixture. On that topic you should also check the intake silencer rubber mount itself (they crack and can let in air) also if you take it off the intake silencer you will see that the rubber mounting flange is not a complete 'round' (there is a flat to locate the silencer at a particular position) once again if the 'flat' is not correctly fitted it will let in air and weaken/bugger up the mixture.

    Also do you have a tethering 'string' attached to the silencer??? This item is very important and is not just a means to retain the silencer from going in the prop should the silencer fall of!! Its main function is to stop the silencer carb assembly from being twisted rearwards during high accelerations (that action will cause one cylinder to get all the fuel and the other dramatically less (split egt's). To that end the tethering string should be taught on the ground resisting any rearward motion of the intake silencer.

    On the topic of plugs colour etc - I have found that modern fuels do not give 'colour tune' type indications! Basically I therefore set the carb at manufacturers settings ensure no air leaks (throttle choke cable gaiters etc) and then gap the plugs (the jets and needle then sort out the mixture) if I then get 'ok' egt's then all is well!

    Just occurred - is you choke cable or manual - the manual type if screwed on by a 'Gorilla' can 'puncture' the air slide tower and cause weak/variable mixture?
    Last edited by oldbaldyman; 20-06-17 at 10:03 AM.


  2. #82
    Captain kawasakiinit's Avatar
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    I will look at the choke slide but it looks fine tbh. My air box silencer has two supporting steel bars bolted to the engine case so its not gonna move anywhere bud.


  3. #83
    Co-Pilot oldbaldyman's Avatar
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    Make sure those supporting steel bars have not punctured the intake silencer? Also that they are actually doing their job (they are very prone to fracturing).
    Not choke slide the air slide tower is the main bit of the carb that is above the intake.

  4. The Following User Says Thank You to oldbaldyman For This Useful Post:

    kawasakiinit (20-06-17)


  5. #84
    Captain kawasakiinit's Avatar
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    had a good look around the carb today mate ,all looks well . the steel bars are bolted to the plastic air silencer and they are then epoxy glued as well which has not cracked or anything .. gonna run it again now and see what's what..

    if nothing else ive learnt alot through all this with the help from you and everybody else ,cheers ...again i hope i don't have to bug you again on this lol..


    Dave.
    The more people I meet the more I love my cat..


  6. #85
    Captain kawasakiinit's Avatar
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    just thought id update this for the purpose of anybody else having similar troubles . it turned out to be the wrong needle in the carb ,after being advised to put a 15k2 in it to get temps down it was over fueling but only showed a problem in certain conditions weather wise. the original needle in the carb was unmarked and only had 3 slots for adjustment .my engine is an early one with single carb so doesnt have the 15k2 needle like the later models so i had to order the correct needle from america 6h2 as per following link..

    https://www.aircraftspruce.com/catal...ttingchart.php
    The more people I meet the more I love my cat..


  7. #86
    Captain Randombloke's Avatar
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    Worth measuring the coils and the stator that feeds them for resistance.

    When the stators develop the odd shorted turn they go low resistance. They then do not provide the coils with enough juice.

    Simon at Eccleston is a diamond and understands the ignition circuit very well, worth asking him what he thinks.

    He threw some numbers at me when I had an ignition problem no my 582 and within minutes I'm tracked the problem on the basis of his advice.

    But the Rotax manual should quote resistances for the coils.
    Steve U.
    PG, HG & microlights
    "Weekend bimbler, day to day car driver & genuinely undeserving Southern oik who has never done anything of any worth"


  8. #87
    Captain kawasakiinit's Avatar
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    this thread is now over 3 years old and it was sorted a long time ago with the carb needle as mentioned.
    Last edited by kawasakiinit; 15-09-20 at 21:34 PM.
    The more people I meet the more I love my cat..


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