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Home Forums Bikes DIY / custom builds Carb Tuning – deciphering the voodoo and black magic within

This topic contains 20 replies, has 9 voices, and was last updated by  Eddieb 1 year, 2 months ago.

Viewing 15 posts - 1 through 15 (of 21 total)
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  • #8869

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

    Carburettors can seem a bit like black magic and voodoo if you are not familiar with them and how their internals work.

    Here’s a diagram that shows the throttle ranges that the standard components that can be adjusted affect, there are other factors than can be changed but that’s getting into more serious modifications.

    #8900

    Peter
    Participant
    • Location:
    • Bike:
    • Rank: 250cc Rider

    I have deciphered the voodoo of carb tuning and now after countless hours of fiddling with jets float hights and mixture screws have it 100% sorted. I ring Brett Roberts 0274031119 he has a dyno and knows carbs . For $50 he tunes and has instant proof of improvements or other problems clever bugga.He generally gains about 5 hp on a tune well worth the money and time saved.A clean air filter new plug and fresh gas and a thick skin are all thats required (hes a sarcastic bastard)

    #8995

    Mark Claasen
    Participant
    • Location: Auckland, NorthShore
    • Bike: 1200GSA KLR650NE WR450 RMX250, DR750,
    • Rank: 400cc Rider

    Us KLR guys talk about this a lot, they come a touch lean in the emission range, needle mostly, and rich in the main to compensate, so when you change the needle only, they end up using to much gas if you don’t go down on the main, good old fashion fun and tinkering.

    Attachments:
    #8901

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

    Where is Brett based? for that money I’d put my bike on and get the fuelling sorted.

    #8902

    Peter
    Participant
    • Location:
    • Bike:
    • Rank: 250cc Rider

    The dyno is in Otahuhu

    #8932

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

    @peter said:
    The dyno is in Otahuhu

    Does he have a company website/facebook page or anything?

    I wonder if he’d be interested in running a Adventure Riding NZ dyno day?

    #8941

    Peter
    Participant
    • Location:
    • Bike:
    • Rank: 250cc Rider

    Best ring him and organise direct i am sure he will be keen.I don,t think he has a web site probably too busy rebuilding motors and restoring bikes to bother.

    #8943

    Hadrian Haine
    Participant
    • Location: Waerenga
    • Bike: 08 Husaberg FE 450 and a classic 86 Honda XLR250R
    • Rank: 400cc Rider

    I’ll try find the link 2night but there was i page i read that had good trouble shooting tips when tuning carbs. Not that i’m storted mine fully yet…

    #8998

    octopusenvy
    Participant
    • Location: Te Tai Tokerau, Aotearoa
    • Bike: 2102 Husaberg FE570 Rally Australia Bike, 2007 BMW 650 x-Challenge, 2009 Buell XP Ulysses Police Duty (1 of 137)
    • Rank: 650cc Rider

    thanks eddie!

    #9000

    Michael J Breen
    Participant
    • Location:
    • Bike:
    • Rank: 400cc Rider

    What’s a ‘carb’?

    #11562

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

    Checking the colour of your spark plugs is a good way to see how your bike is running and whether your carb tuning is correct.

    I’ve pulled my plugs to find the bike is running a bit rich so I’ve leaned it off a little by dropping the carb needle one clip position and it’s running heaps better.

    Will the spark plugs change colour to reflect the change and if so how long/km’s will it take to reflect the new tune?

    #11582

    ApewithHumour
    Participant
    • Location:
    • Bike:
    • Rank: 250cc Rider

    I like most am happy when I turn the key, it starts and runs! If I start dicking around with all of this magic, Voodoo stuff I am sure to F**K something up either in the dismantling or the OMFG, where did that bolt go, or what is that thing on the floor and where does it belong syndrome….
    Nice to know, thanks….
    If I was buried in snow 7 months of the year I would know my bike as well as Bruce Jenner knows his willie…
    Oh wait, that’s not a good simile…
    I would know my bike as well as anyone that tinkers for 7 months on ADV rider….
    🙂

    #11585

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

    If a bike has any intake, engine or exhaust modification from stock then the fuelling should be looked at the get the best performance and economy from the changes.

    My bike is heavily modified, airbox, carb and exhaust and some exhaust porting so getting it to run right has been an ongoing process of tweaking. I think I’ve got it pretty good now. It’s a lot stronger than a stock DR.

    You should take it for a spin up the road at Taumaranui.

    #12047

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

    Here’s a better diagram about what parts of the carburetter affect it’s performance at different throttle openings.

    #12085

    Badjelly
    Participant
    • Location:
    • Bike:
    • Rank: 400cc Rider

    If there was a group carb-tune session on that dyno I’d be interested.

    Thanks

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