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Home Forums Bikes Suzuki DR 650 Bogging off idle

This topic contains 2 replies, has 3 voices, and was last updated by  Vishan 3 years, 1 month ago.

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  • #9341

    davidburton
    Participant
    • Location:
    • Bike:
    • Rank: 80cc Rider

    Hi there, this is my first post on here.

    I have a quick question regarding my DR650. I think it has a pumper carb on it, which I thought was meant to cure the hesitation at low revs. Problem is, when I crack the throttle open at low revs, it coughs, splutters and then pulls smoothly after that.

    I have attached a few photos of the carb. Could anyone identify it?

    In the one with my finger, am I pointing to the idle jet screw? I was wondering what the stock setting for that screw is?

    Basically I’m at a loss and have no experience with these carbs. Any suggestions greatly appreciated.

    Dave

    #9345

    Eddieb
    Keymaster
    • Location: Hamilton, New Zealand
    • Bike: Suzuki DR650 ADV
    • Rank: 1200cc Rider

    First off welcome.

    The shape of the carb looks like a flatslide carb, its definately not the stock carb so it could be a Mikuni TM40 which is a common upgrade for the DR.

    I’m not familiar with that carb but the screw you are pointing to is where I would expect the fuel adjustment screw to be based on other carbs.

    It sounds like either carb needs a clean, or the idle fuel mixture isn’t correct. If the mixture isn’t correct that could be due to where the adjuster screw is set, or due to the idle jet not being the correct size.
    Have you established how many turns from fully in the screw is currently set at? I would expect it to be be in the 2-2.5 turns range.

    Have a look at this thread too for some basic understanding of which carb parts effect what throttle openings.
    carb tuning

    #9351

    Vishan
    Participant
    • Location: Wellington
    • Bike: DR650
    • Rank: 50cc Rider

    Hey brother. Open the throttle very slowly from idle. If it still bogs then adjust your pilot air screw. Google is your friend here. If it only bogs when opened relatively quickly it could be too rich too soon on the pumper. Check this adjustment. The general rule is adjust to the thickness of a icecream stick. Adjust test adjust test adjust test. PM me if you need some help.

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