GAS Motorcycles - Page 9 - Popular Questions, Answers, Tips & Manuals

How long has it been since it was last run ,to.me it sounds like the carbs are full of stale fuel and probably blocked up with emulsified fuel.

first off are your plugs gapped correctly? Also how long has it been since the valve lash has been set? Is this a battery powered ignition system or a CDI style? If it's battery then a good battery source is needed, also check every ground and every single switch between the hot side of battery to ignition coil, include your start button and also the engine kill switch(which should be open)

Similar issue at this site: dly 300 Crusader flooding issue Also issues of flooding for ATV's can be found here: http://www.superiorpowersports.com/ATV_TROUBLESHOOTING_AND_MAINTENANCE_s/161.htm

Hi. Vern the float needles in the carbs need to be cleaned. Also take the plugs out and turn motor to drive out all the fluid. It will also need an oil change because the fuel will get past the rings and fill the sump. Good Luck.

if you have a power valve on that model it needs cleaned after every ride. google it (:

sounds like a sticky float in the carb..

Hi Felix seems like the float needles in the carberator's are gone and allowing fuel straight into the engine. Remove carbs and check them a clean up might do. If not replace the needle and seat. Regards Jim...

The hose that goes down by the battery should be an overflow drain.

fuel filter,air filter

if it has a kill switch then check it for a circuit.

I gather its a dual fuel bike? ( Petrol and gas) On cars that are dual fuel, the engine will always start on petrol and switch to gas after its warmed up. If the engine is warm, it will start on gas. I assume bikes are the same. However, LPG can freeze when it is injected through the fuel system. On cars, a preheating arrangement is installed, usually by having the gas pass through a coil or tank that is heated by the engine coolant. As bikes don't often have coolant, I would imagine that a sensor prevents the gas flow until the bike engine is warm enough to stop the gas from freezing when being injected..

Inadequate spark, improper metering (carburetor), or stuck injector (fuel injection).

you are not getting a spark to ignite the gas. try replacing your plug and checking/cleaning your electrical connections.

Timothy: Try this video on how to take apart the fuel pump: https://www.youtube.com/watch?v=h-TVShZKq6g

If its stale possibly. If its carbureted and the stale gas has sat all winter with no stablilizer- quite likely the carb passages maybe gummed up and blocked- seen this myself..Drain old gas and refill. if fuel injected there may be another issue it should at least fire if the fuel is getting to cylinders and theres a spark.. if a Carb.. the same.. so if carb and no fir or no smell of fuel from exhaust- carb passages clogged or petcock..

THIS IS VERY EASY TO FIGURE OUT..THIS IS A RATIO OF 2 STROKE OIL TO GASOLINE MIXTURE..FOR ALL TWO STROKE ENGINES ONLY..MOST TWO STROKE OIL CONTAINERS HAVE THE CONVERSION CHART ON THEM FOR THE PROPER MIXTURE..ALWAYS SPEND THE MONEY AND BUY A GOOD BRAND OIL ..ALWAYS PREMIX YOUR GAS IN A SEPARATE GAS CONTAINER SO YOU CAN MIX IT UP VERY WELL BEFORE USING IT IN YOUR EQUIPMENT..NEVER STORE YOUR GAS TOOLS WITH FUEL IN THE GAS TANK..ITS BEST TO RUN EMPTY BEFORE STORAGE..THIS WILL PREVENT THE FUEL FROM GUMMING UP YOUR CARB AND SUCH..SAVES MANY HEADACHES..PLUS SAFER..

Hi Paul: I'd be suspicious of a fuel restriction. May I suggest flushing the carb (there should be a drain screw on the bottom) and see if you can find a fuel filter that needs cleaning or replacing. It may be that a high speed jet in the carb is obstructed. if flushing it did not help, try removing it and use compressed air to gently blow through the orifices (fancy word for holes). Hope this helps.

Assuming that the fuel spigots are open, check for crud in the tank which is clogging the fuel line by blowing some compressed air backwards through the spigots, and change the fuel filter.

Replace with new spark plug.

Hi Robert: Try replacing the plug in the cold cylinder.