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Thread: Mileage on RX 100 went down

  1. #21
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    Quote Originally Posted by SriramEfunds View Post
    Did you try to know what exactly was the issue? And what adjustment was done to the carb? Post those details here so that if anyone in future faces similar issue would know what needs to be done.

    Thank Old Fox Sir for the detailed explanation.

    It was the float level that had to be adjusted.

    Thanks a lot for all the help Old Fox and Sriram

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    Quote Originally Posted by pv1984 View Post
    It was the float level that had to be adjusted.

    Thanks a lot for all the help Old Fox and Sriram
    Can that float level thing happen to other bikes too ?? I mean can having incorrect float level in mmy new bullet cause low average... kindly tell us about it please.. thanks

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    Quote Originally Posted by lovish View Post
    Can that float level thing happen to other bikes too ?? I mean can having incorrect float level in mmy new bullet cause low average... kindly tell us about it please.. thanks
    I believe float level is applicable for all the carb's and hence it will affect if its not set right. But you mention to have a new bullet and hence I don't think that is the reason.

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    Super Moderator Old Fox's Avatar
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    @pv1984: Good to know things have worked out for you.

    Quote Originally Posted by SriramEfunds View Post
    Old fox Sir, first I'm delighted to see your post here.
    Wonderful explanation there Sir on the working mechanism of the float. I wouldn't have suspected the float, needle valve assembly until at this stage. May be climbing down stage by stage here. First the color of the plug, AFR, leaks(flooding), float needle pin.

    Prakash:- Do you have choke plug on the carb or at the handle bar? I would suspect needle valve assembly might be the culprit on which the float hangs.
    Good to catch you here Sriram.

    I went straight to the float thing because in the very first post Prakash had stated that he'd had problems with a persistent fuel leak (which I suspect was actually an overflowing carb) and was solved by replacing the needle valve. A new needle solved the fuel overflow issue but the fuel level in the float bowl remained too high - hence the high fuel consumption. A stuck choke valve would usually cause the engine to what we used to call 'four-stroke' or 'Motorboat' as thats what it would sound like It is something you can replicate by stuffing the tool-kit of the Rx 100 into the air intake instead of its rightful slot right next to it as your's truly did many many moons and suns ago

    And BTW, check out this link for some good details on carburettion if you haven't already that is.

    http://www.thisoldtractor.com/gtbend...rto_manual.pdf

    Quote Originally Posted by lovish View Post
    Can that float level thing happen to other bikes too ?? I mean can having incorrect float level in mmy new bullet cause low average... kindly tell us about it please.. thanks
    Lovish: Yes...it applies to all carbs with float chambers. But do stress upon your mechanic not to make any big adjustment with float height or you could end up with an engine starved of fuel. Just a touch is needed. The usual 'ratio of adjustment to effect' is like 1:5 meaning that a 1mm adjustment at the float tang will translate into a 5mm change in the fuel level in the float chamber.
    I don't let my motorcycles interfere with my motorcycling...

    Join xBhp On


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