Posts
22
Joined
6/30/2015
Location
CA
Edited Date/Time
4/13/2016 1:14pm
Hey everybody I have a 2003 rm250 that I have had totally rebuilt I now have got the engine in the frame and it's not starting. I know that I have a spark (I checked) I have fuel to the carb not sure what's going on inside the carb. When I took the the plug out it was wet with fuel so that tells me that there is fuel to the camber right. I also put a little fuel down the spark plug hole and it doesn't ever tru to fire. Any replies would be great
If you had the flywheel off it was put on correct with the woodruff key in place because it determines the firing time.
It has spark you typed, you removed the plug and layed it on the head and kicked it thru?
The reason i ask is because i just use a new plug leaving the one in the engine to check spark but that doesn't eliminate a bad plug,one that has been dropped and cracked or closed gap.
Also,checking spark with the plug out can cause a fire if the engine case is full of fuel from a stuck float needle,fuel sprays out the plug hole and gets ignited by the spark of the plug laying on the head. Once you experience this you dont forget.
If it didn't try to fire with the fuel you added in the cylinder it seems like the timing of spark is off. All wiring is connected correctly ?
turn rightside up, install new plug, hold wide open, try to start again.
check plug again for wetness if not starting, if dry then turn fuel back on and restart the process.
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The timing you can pull the cover off and verify the marks next to the flywheel.
all you need to fire the motorcycle up that is left is compression.. If it is new and you didn't do the work the possibilities are quite endless as to why it wouldn't be starting as you have no basis to know what was done and not done. If someone else did the work you would think they would have started it prior to it leaving, if that didn't happen then you will have to start at square 1 and go through and verify absolutely every detail to see if it was done correctly, and if you can do that, you should probably have done the work to begin with.
- Reeds could be chipped or warped. Verify.
- powervalve stuck open. remove exhaust pipe and look in the exhaust port to verify powervalve is fully closed.
- coil not grounded well to the frame. Was the frame painted or powder coated? Make sure the coil has a good metal to metal solid contact with the frame mounts. Sand off paint as needed.
- wiring harness. might have gotten pinched or cracked during all the work. Inspect carefully. Also open all connectors, blow out with contact cleaner and then air and then re-connect with dielectric grease.
And compression.. i have seen rings put in the wrong way up... sticks in the piston , no compression
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