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Starts and idles fine. Dies if you try to give it gas.

Posted by Anonymous on


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Check that the carb jets are clean if one is blocked up even just a little the motor wont rev up well also check that you have a good fule flow to carb and the air filter is clean,,
you can check the jets in the carb by giving the bike a little choke then try reving it up if it revs it has a blocked jet in the carb

Posted on Jul 13, 2010

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  • bikermad2010 Oct 25, 2010

    no offence mike but a benelli velvet 125cc is a automatic scooter with a automatic choke and not a manual one so the chances of managing your suggestion is next to none... on the other hand.. good advice as if the bike idles but will not rev or does rev but only when you feed it slowly then it (in most occasions) would deffinately be a block in either your main jet or sub jet, but remember your sub jet might not look blocked but since its so small its hard to tell and the sub jet is responsable for the first 3/4 of your acceleration, the main jet is mainly for the last 1/4 of the rev on final drive

  • Norman Skinner
    Norman Skinner Mar 10, 2011

    I would actually suspect that the automatic choke is stuck (at least partially, or mostly) in the choked position.
    This would allow the bike to start and idle, especially in colder weather, but trying to give it gas would make it bog or die.

  • Andrew Porrelli
    Andrew Porrelli May 04, 2011

    If the choke is stuck on(or air filter/air filter intake blocked), the spark plug electrode would be black & sooty as an indication of the rich fuel/air mixture. If the problem was a blocked jet the result would be a lean mixture which would be indicated by a bleached white colour on the spark plugs porcilin part(sometimes yellowish). My old boss always said" used plugs tell a story".


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Need to know what kind of bike this is and how many carbs are on it?

  • From your description it sounds like your pilot jet is clogged up which is the smallest one in the carberator. Next if you have the carbs off i suggest cleaning all passages with carb cleaner!! Use little red nossle to spray into each jet and see where it is suppose to come out. Manually remove each jet one at a time and clean it with carb cleaner. After you get that done, reassemble carb and try and start bike again. Or in this case, i suspect scooter again. Which means you only have one carberator. This should be a piece of cake to repair. But you have to follow these procedures.
  • Remove carb from bike.
  • Flip carberator over and drain of all gas.
  • Next remove largest Main jet and clean out.
  • Locate pilot jet or idle jet and remove it for cleaning and run some carb cleaner thru this passage with red nozzle and see it spray out other end.
  • Then spray complete carberator housing down and check all passages for no obstructions.
  • Use carb cleaner to check other orfices to make sure they are clean and clear
  • If you can't Find the pilot jet, It will be under a little Brass plug which is about 1/4" wide and round in shape and has a tiny hole in it. You will need to drill out this plug slowly and remove all brass shavings from getting into carb.!!
  • Then adjust to 2 1/2 turns out for starters.
  • You can accomplish this by turning in all the way and then counting the number of turns when backing out for the 2 1/2 turns.
  • After that, then check all other orfices and make sure they are clear! Very important.
  • If they all are clean, then reassemble carb and give it one dose of WD-40 SPRAY to keep it clean and to help in reinstallation of the carb to the intake manifold boot.
  • Rehook up carb slider and needle valve and check for proper operation when you reinstall it. Open and close throttle a couple of times. Make sure that there is no sticking or binding, If there is dis-assemble and find source of problem, the reassemble correctly and go from there. Good luck and happy scootering or motorcycling... HDTV GURU JAY.

Posted on Mar 29, 2011


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SOURCE: drz 400 sm starts but i cant give it any gas or it dies

Can you slowly increase the revs? It sounds like an accelerator pump or debris in the carb.

Posted on Jul 31, 2009

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