Question about 2008 Derbi Senda Baja 125 R

1 Answer

Gp1 50cc; when revup engine seems to choke, intermitently.

Cleaned filter, exchanged fuel, cleaned spark plug, still same problem.
Where do I get a repair manual to help myself? tried many websites found only parts offrs and sale pitch.
thanks!!

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  • Derbi Master
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Hi Jdkwf, all I could find was the Derbi website try contacting them to resolve you issue. Good luck and have nice day.
Derbi Senda DRD Pro 50 SM

Posted on Sep 30, 2015

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Posted on Jan 02, 2017

Benimur
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SOURCE: my derby gp1 open 50cc.when you put revs on dies

Hi and welcome to FixYa,

Initially, check for:

  • color of burn tips of sparkplug; if very light brown to almost whitish, then lean. Check for an air leak;
  • if black, sooty, then rich, check for a vacuum leak or oil/gas mix proportion.

Postback results of above initial tests.

Good luck and thank you for asking FixYa.

Posted on Dec 04, 2009

  • 3567 Answers

SOURCE: water getting into carb

The water comes from condensation inside the gas tank. Keeping the tank full of gas will help a lot. Keeping the bike indoors and warm will help even better. Condensation forms on a cold can of Coke. The same happens inside a cold gas tank. Please rate my answer. Thanks.

Posted on Feb 27, 2010

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Since you put it on its side, you most likely dumped all the oil from the crank area to the cylinder and carburetor. What you need to do is check engine oil to be sure it is full. Then take air filter off, clean the carburetor with carb cleaner. Remove spark plug, clean spark plug with carb cleaner. Pull the cord about a dozen times WITH THE SPARK Plug removed. Then install spark plug and try to start.

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I have a 23hp Kawasaki on a mower that won't run without choking and then revup and down till it finally dies. I've changed the air filters. Any ideas on next step to correct?


If the mower has been in storage it is likely that the fuel has evaporated from the carburetor leaving a residue behind. This residue prohibits the fuel from reaching the fuel jets.

When choking the carburetor fuel is drawn into the intake and mixing with air an except-able combustion mix is achieved allowing for short runs.

Drain all the fuel from the engine and replace. Use a carberator additive that will clean the carburator. Attempt to maintain combustion by throttling the choke. If after several tryies you are not able to sustain engine running even with a paritial choke you will need to clean the carburabator.

Hope this had helped?


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26176327-b03ojqwqtbsecjv14p2f4cy4-2-2.jpg

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I have a clark g900/700w generator.i started up today.started ok but when i turned the choke off it started to cut out.it will only run on half choke thanks


Is the gas fresh?
Possibly stale gas is the problem
http://www.clarkeservice.co.uk/manuals/generators/g900.pdf

Has engine been serviced: clean air filter, fuel filter, spark plug.
Clean out fuel system with carburetor cleaner. Place about 12 oz. in fuel tank and run engine.

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Check your choke adjustment. Sound to me like the choke is coming on. Loosen the choke adjustment and see if it still does it.

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I have gas in my oil and gas is pouring out the spark plug hole wats the cause of this?? sears crafsman lt 1000 briggs and straton intek,18 hp needle valve in carb seems ok,fuel solenoid working wat...


Gas in the spark plug chamber should mean it is flooded.trying to start it for too much time with the choke on will do this.when starting cold,engage choke.turn engine over till it tries to start.if you can't disengage the choke before it stalls,do not re-engage the choke.just keep turning the engine over,or pull starting,whichever you have,until the unit starts.it will.for now,if the sp.plg.hole has fuel in it,blast compressed air to clear it somewhat,re-install sp.plug,never overtightening,just snug,and try starting without the choke.hope this is useful.bart.i am a certified small engine mech.and remember when finished,let unit idle for 2 min. Or so and cool before shutting off.change oil religously every 50hrs.for units over 10hp.,every 25 hours for engines below that.they will last a long time.clean air filter after every two or three uses.never empty fuel when storing,use STA-BIL.

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2 Answers

Choke seems to be on... runs very rough....


There are several ways to do it
a. Check carburetor if not clean pump it on the intake if that not solve try to clean it. with Lacquer thinner to dissolve the dirt.
b. Check spark plug if some are not working. In checking try to pull one by one the high tension wire and listen if the sound vary if the sound remain when pulling one wire mean you have problem with your spark plug. So replace all spark plug with the same spec.
c. or lost compression on cylinder.
d Check if you fuel filter if some dirt and replace it.
e. Clean your air filter with compressor or replace it
f. Check the clearance to the Contact Point it must have 1 mm or .8 mm spacing when not at firing mode ( just like the thin of the hacksaw blade the space of the gap of the contact point.)

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I don't know the plug number. Off the shelf chain saw plug from small engine repair shop will replace existing plug.

First of all, are you getting spark?
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Look at exhaust port. Is there anything that would stop the exhaust from escaping?

Can you get to fuel line running into carburetor? See if gas makes it all the way to the carburetor.

Can you get to the air filter? Is it dirty? Can you spray WD-40 directly into carburetor. A saw that has good exhaust, spark and compression will fire on WD-40.

If your engine can fire on WD-40, but will not stay running, then carburetor is suspect. Maybe gum out will work. Try to keep the engine going on WD-40 and see if that opens the carburetor.

If you can keep engine going on WD-40, that takes both hands ... use your third hand to move choke and throttle levers and see if the engine can start on its own.

Upvote if this information helps. Thanks for the feedback.

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