Fuel goes from tank to carby but doesn't start. (air and spark ok) Do I need to remove the carby? How do I best do that?

Install a 75 micron fuel filter into the fuel line coming from tank. Make sure fuel line to carb (from on/off valve ) is not obstructed. There should be a steady continuous stream.

Loosen or remove fuel cap (as a test) to see if that helps. If runs ok without fuel cap, replace fuel cap,

If fuel cap doesn't help, turn off fuel and remove fuel bowl, turn on fuel. Again there should be a steady flow of fuel. If not, remove float and inlet needle and clear obstruction. Reinstall needle, float and fuel bowl. If still wont run properly, order a chinese replacement carburetor ($15 US delivered) and replace carb. Then drain fuel from tank and fuel bowl end of every season.

have you tried starting with the air intake pipe/hose removed from the carb ? if still wont start i'd strip carb down and clean out the jets , not forgetting the idle jet at bottom of bowl , also check the diaphram pump is in working order , rubber diaphram still flexable not holed etckeep me posted if you wish

take the plug lead off and hold it near to some metal part on the mower, move the throttle lever to around midway and pull the mower cord, if there is a spark the electrical part of the mower is working.
remove the plug, put the lead back on the plug and earth the plug on a metal area and pull the cord again, if there is spark across the points on the plug then the plug is ok, if not replace the plug and try again.
assuming that the plug and lead checks out fine then check the fuel supply, remove the air filter from the side of the carbi and spray some fuel directly into the throat of the carbi and pull the starter cord, if the engine runs for a few seconds you can assume that you have a fuel problem, possibly the filter inside the fuel tank is clogged.

if you have good blue spark and it fires when fuel is added externally , then the problem is fuel flow through the carby
have the carby professionally overhauled or get a new carby
make sure that the gasket to the manifold / head is in good condition

Ok mate few things to consider here, if the bike has been non started and stationary for a year there is a very good chance that one of the following or all of the following has occurred.
Your battery is dead (they don't like just sitting - doesn't matter new or old, if left for extensive time they will die) Your gear / motor oil would be useless - oil can not just sit in bottom of bike for a year it would be glue
Your carbi would be blocked or partially blocked from fuel gum or varnish in jets
If you like this bike I highly recommend oil and filter change, New spark plug (put about 10 drops of oil down the spark plug hole before you put new spark plug back in to lube the piston) clean air filter (or fit new one) Remove carbi and compressed air clean all jets especially the pilot jet and circuit and stick in a new battery
Once all done for the fist start I would find a nice safe hill and push start it. in my experience under this circumstances if you rely on the electric starter you may find you burn it out trying to start so give at least few minutes running motor to flush everything through before trying to electric start would be your best bet
When you get it going I would dump the oil and oil filter again after 2 hours ride time to confirm all the old expired oil is flushed out - just to be safe
good luck regards Jamie

Remove the fuel tank cap and check if the vent is letting air into the fuel tank-- run the engine with the cap loosened-- best to try this with half a tank of fuel so it doesn't splash out -- if it keeps running then the cap vent is blocked -- if it is the same then check any fuel filters for blockages check fuel lines for kinks make sure fuel tap is turned on properly-- if this fails then you might have a blockage in the fuel jets in the carby

I hope this helps

Andrew A

You are very welcome. Any chance you could rate my answer ?

thanks...

Charlie

it sounds like a fuel problem.
first drian fuel out of tank.
i know you have already cleaned the carby but dis assemble carby and clean with carby cleaner.
re assemble carby & fill tank with fresh fuel.
also clean air filter & check oil level & check spark plug,if the spark plug is black and the tip is blocked with oil build up, then replace.

firstly make sure you have spark , have some turn the car over have on spark plug lead removed with plug inserted , rest this on rocket cover an check for spark , if spark is o.k then you have fuel blockage , fuel can go rotten after three months , to test for blockage , remove air cleaner cover and pour a small cap full of petrol into carby , then try to start with foot down on accelerater , if runs then stops you have fuel blockage .you may need to get fuel system cleaned and fresh fuel in tank..
hope this helps.

It may have a blown crankcase seal. How did you check the plug for spark?
you can remove the carbi and spray 2 stroke fuel directly into the chamber and try to start it.
If it starts you have a problem with the carbi or the fuel supply.
Take out the air filter as it may be blocked and restricting the air supply.
The float in the carbi may be full of fuel due to a hole in it or the fine fuel filter in the carbi may be blocked