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I have a ccm 644,ever since I bought it,its leaked fuel from carbs,ive had carbs off 2 or 3 times,cleaned them,but every time I get it stop leaking and I put the bike away for a couple of weeks,next time I get it out,its back leaking fuel again,carbs flooding

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  • CCM Master
  • 2,825 Answers

Flooding carbs often means that the needle valve that the float is supposed to close is leaking, causing the float chamber to overflow. replace needle valves.

Posted on May 07, 2014

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 2336 Answers

SOURCE: carb issues

Sorry to hear about your carb issues. Two possible issues that come to mind are (1) fuel level in the bowl most float assemblies are made of brass and have a small tab which applies pressure on the float needle. If this tab is not adjusted correctly the fuel will not shut off when the float reaches its maximum height. The tab can be bent to apply pressure at just the right moment. You can verify this by doing a bench test, with the bowl off. So much nicer to know before going through all the work of putting it back on the bike. (2) Check the buoyancy of the float itself many of the old-school foam ones dont have enough umph to close the needle all the way. If you have the brass style floats make sure you dont have a leak. ( submerge the float then check for air bubbles also shake the float and listen for gasoline within) Check with GDL Cycles they can help you with those hard to find parts for many old school Japanese bikes.

Posted on Nov 10, 2008

  • 1 Answer

SOURCE: BMW R80 1987 Leaky Bing carburettor…

I had the same deal.  After the rebuild kit, it still happened.  Against the advice of my mechanic, I filed the top of the float ever so slightly, decreasing the chance for the top of the float to come into contact with the dome of the carb.  2 years later, no leaks.  And always - always - turn off the fuel when not mobile ;>)

Posted on Mar 18, 2009

goofduck
  • 490 Answers

SOURCE: 1998/99 kx 125 fuel leaking from carb outlet at bottom

sounds like the needle and seat may be the problem

Posted on Apr 15, 2009

  • 3567 Answers

SOURCE: when start go to rev it just dies

Remove the throttle stop adjuster and the air screw adjuster and spray carb cleaner in the holes.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Turn the pilot screw 1/4 turn counter clockwise. Check the float level. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower.Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. Adjust the idle speed with the Throttle stop screw. This process should get you back on the road. A “very helpful” rating for this answer? Thanks!


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Posted on Jun 22, 2009

  • 3567 Answers

SOURCE: 81 Suzuki gs650 #2 carb floods gas out after start

The float is stuck open in the leaking carb. Remove the float bowl and clean the carb after removing the pin holding the float in place. While the float is out, shake it to see if gas has gotten inside it. If so, you will need a new float or will need to drain the float then re-solder it to seal it up again. To drain the float chances are you will need to drill a vent hole in it to allow the gas to drain. Just solder the vent closed when done.

Posted on Jul 14, 2010

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I have a ccm 644 that won't start bought new battery and checked the air filter which had oil in the bottom of the filter box. Turns over no problem but no start any ideas.


Hi, Philipirk and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have a nice day.
CCM 644 Dual Sport Supermoto 2003 service manual DOWNLOAD FREE FULLMANUALS...
Rotax Manual pdf
CCM Spares 644 Dual Sport
CCM 644 DS Dual Sport Parts
CCM 644 Dual Sport

Jun 10, 2014 | CCM SR-40 Motorcycles

1 Answer

Why does my ccm 644 keep floading,had carbs off 2,3 times,i get it to stop,put the bike away for a week or so,go back to bike,try starting it and the carbs start flooding again,need help thankscarbs...


I think this may be another one of those faults due to the ethanol and other **** in modern fuels.
There is so much rubbish in petrol the stuff just wont keep also ther have been a lot of problems with the stuff rotting fuel lines this may be your problem, the float needle may be getting stuck by particles of fuel line.

May 06, 2014 | CCM Motorcycles

1 Answer

Why I have a ccm 644,ever since I bought it,its leaked fuel from carbs,ive had carbs off 2 or 3 times,cleaned them,but every time I get it stop leaking and I put the bike away for a couple of...


Hi, Anonymous and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have nice a day.
53 plate CCM 644 DS Burton on Trent
Adventure Bike Rider
CCM 644 Dual Sport Supermoto 2003 service manual DOWNLOAD FREE FULLMANUALS...
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May 06, 2014 | CCM Motorcycles

1 Answer

Ccm 644 fumes through carb


Hi, Anonymous for more information about your issue and free downloads that you will need please visit the websites below. Good luck and have a nice day.
Air movement through carb
ccm 644 need more power
http://www.ludd.luth.se/~joshua/xf650/xf650service.pdf
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Nov 04, 2012 | 2002 CCM RC 30

1 Answer

Ccm 644 misfire


Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intake air leak.
8. Water, dirt, or rust in the fuel system, carburetor and/or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose, dirty, or corroded ignition module connector at crankcase.
13. Faulty MAP, CKP, O2, and/or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damaged intake or exhaust valve.
For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have nice a day.
http://forum.ccmmad.co.uk/topic/7175656/2
2003 CCM 644 Dual Sport Review Test Ride
Rotax Manual pdf
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Feb 25, 2012 | 2007 CCM 644 DS Dual Sport

1 Answer

Ccm 644 carbs flooding when engine off


Hi, Anonymous and the usual suspects are:
1. Dirt or other foreign matter between float valve and its seat.
2. Float valve sticking.
3. Float valve and/or valve seat worn or damaged.
4. Float misadjusted.
5. Float cracked, leaky or damaged.
6. Excessive "PUMPING" of hand throttle grip.
For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have nice a day.
Carburetter experts required
http://www.hainesmc.co.uk/ccm_motorcycle_spares/ccm_644_spares/ccm_644_carburettor_spares_and_upgrades
CCM 644 Dual Sport Supermoto 2003 service manual DOWNLOAD FREE FULLMANUALS...
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Feb 21, 2012 | CCM Motorcycles

1 Answer

Ccm rl125


sounds like the carb is flooding , remove the carb and check float needle is clean and not stuck open !

Jan 21, 2012 | CCM Ona Motorcycles

1 Answer

I have a ccm r30 644 2004. The bike will not start i am getting fuel to the carbs but i presume its not going through to the head. I have taken spark plugs out and checked them i have also added a little...


dump the float bowels and inspect/ clean as necessary. consider buying an acid bath solution sold at your local parts store just for this sort of thing or carb cleaner and a toothbrush. you may need to clean your current/ buy new jets for your carbs. just try spraying starting fluid into the carbs while starting the bike by removing the air filter first and try to keep it going as long as possible this may get the juices flowing on its own. goodluck

Mar 10, 2011 | CCM RC 30 Motorcycles

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