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From the day at the dealer in 04 this bike has been hard to start cold! hot It start great. It will only start cold if the choke is on with starting fluid then only run for a few seconds then die. Do that 8 or 10 times then have a great day riding. The problem has gradualy become worse over time. I have been through the carb several times. It has always run lean so I went a little biger with the main jet. didnt help. spark is always good. I have checked valve lash and checked compresion.Any help would be great thanks.
You will have to check the float level of the carburator, try too, to blow out with compressed air the primary jet.
You will also have to reset the air-mixture screw and its better to have it a little on the rich side.
Also check the spark plug gap.
Hope this helps!
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The carburetor choke valve might be stuck open or not closing when the engine is cold. The engine needs a richer mixture to start. Too rich a mixture (flooding) can also cause trouble. Turn the fuel valve off to be sure the carb isn't leaking when not in use. If it smokes black on startup, it's flooding. Also check the condition of the spark plugs.
The fuel in the carburetor float chambers is boiling while it sits, and flooding the engine. If it has a fuel petcock turn that off, and let the bike stop through fuel starvation. Then there will be no fuel in there to boil.
Runs better with choke means the mixture is lean,
Has the exhaust been changed.?
Did this problem just begin.?
Check for air leaks on intake manifold.
Clean carb.
Check valve clearances
raise the needle jet one notch
one size up in the main jet.
check one item at a time, and write notes about jetting changes.and improvements
I also run Moreys upper cylnder lube, helps starting hot or cold, and helps stop "cough stopping" with heavy rear brake use
I have 2009 lawn tractor that will not start (from day 1) unless I use a small squirt of start fluid into the air cleaner area. Nothing else seems to work. The battery will run down before it starts. Once engine is warm it starts great. Love the tractor, hate the starting problem. Elevation is not a problem in michigan.
sounds like a dodgy mis reading of a sensor caused by electrical resistance which is turning choke on and flooding engine.know the fault but without car in front of me its difficult to diagnose,could be auto choke sensor which is on right hand side of cylinder head ,but not sure.best is probally dealer have you tried spark plug gaps ??25th although this would cause problems with cold starting not hot starting but its worth a look
The normal reason why a hot engine doesn't start is the choke. Your fancy new range rover will have a computer controlled choke that will be activiated by a temperature sensor. maybe this has failed or is disconnected In my ancient range rover I have a manual choke but essentially the same engine. I know that if the motor is hot I can't start it with the choke on.
The way the choke works is it restricts the airflow into the engine so that there is a richer fuel / air mixture which is needed for a cold start. If the engine is hot and the choke comes on the engiine floods with petrol and there isn't enough oxygen for it too ignite in the cylinders. To start a flooded engine you have to open the choke and crank the motor without pressing the accelerator. This pumps out the petrol vapour and eventually it will fire and start. If the computer thinks it is cold because of a disconnected or faulty sensor it will put on the choke whenever you try and start and the engine will flood.
I think a vapour lock is unlikely unless you driving in extremely hot weather (above 40 degrees celsius).
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