Question about Triumph Adventurer Motorcycles

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Idles fine, when giving hard throttle, the slides bog and stalls.

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  • lstrick Aug 29, 2010

    OK, we are looking for carb adjustment problems.
    Hopefully someone with knowledge of the specifics of the Mikuni BSD 36mm triples on the 98 Triumphs.
    The bike was running fine then started flooding. I worked with the carbs until I was frustrated. Gas, filter, plugs, floats - all good (there ain't no fuel pump!). I took the carbs to the shop friday... he cleaned everything and replaces the o-rings on the float assy. Fuel was bypassing the float needles - all three carbs! This was noticable by putting gas to the hose and would seep out the inlet jets. This went away with the new o-rings. I can't get in touch with the mechanic until monday, was hoping all was fine today when I installed them. The problem is "Fluttering" of the slides when giving throttle. Slight throttle brings up rpms. Somewhere around half throttle or cracking the throttle causes the "flutter" and engine wants to stall.

  • lstrick Aug 29, 2010

    Hello "J",
    Did you read the part where the carbs were just cleaned? I am using this service because I can't get in touch with the mech that just cleaned 'em till Mon. I wanted to get it running today..tonight now... maybe I'll get it tomorrow.
    I used the sea foam in the beginning of the summer when it started acting stupid. Then once I had the airbox off, the problem was obvious - flooding out intake jets.

  • lstrick Aug 29, 2010

    What else can I say? If you read all my posts you will see - I can't crack the throttle without the slides fluttering. The exact carb type: Mikuni BST 36mm Flat Side CV. # of them. They all are doing the same thing. I'm going out again... gonna put the airbox back on and check again.

  • lstrick Aug 29, 2010

    Please read all my comments, especially the last one.

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4 Answers

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  • Triumph Master
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This is likely a fuel problem, but without the year and model, it is hard to know if you need to rebuild the carbs or check fuel injection sensors.
Assuming carbs, first take off the air cleaners and look in while accelerating (watch out for backfires so don't get too close).
The dashpots must be moving freely and equally.
Check the dashpot dampers to make sure they are not empty or sticking.
Make sure the chokes are off, and the jets is in the up position.
Watch if the fuel seems to not increase as the dashpot rises.
It is possible there is a restriction in the float chamber.

Posted on Aug 29, 2010

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  • Expert
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Sure sign of insufficient fuel reaching the chambers. Clean/replace the fuel filter if any. If it has a fuel pump, make sure it is pumping enough fuel. Check the spark plugs as well. They should be giving blue spark.

Posted on Aug 29, 2010

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  • Master
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Hello. You have crud in the carburator. Use a bottle of Seafoam added to your fuel to see if that will clear the probem. If it will not, you will have to rebuild it. J.

Posted on Aug 29, 2010

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  • Master
  • 2,559 Answers

First check the list of things below.
Air filter.....is it clean?
Fuel filter? Is it clean?
Fuel pump pressure? Good?
Spark plugs?...how old are they?(.....maybe not enough spark for under load conditions in the cylinder.)
Once you have ruled these out, You need to look at the high speed jets in the carbs.

Hope this gave you a good idea of what to look into..

Posted on Aug 28, 2010

  • Randy Hough
    Randy Hough Aug 29, 2010

    Sounds like the jets are still slightly clogged or they were put in wrong (Hi speed jet where low speed jet should be etc....

  • Randy Hough
    Randy Hough Aug 29, 2010

    This is a carb jet issue or the timing is off, if you have done all the carb checks then you will need to have the timing set and maybe even a valve adjustment.

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