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Diagnosing why a dirt bike (2-stroke) won't start.
Posted December 26, 2008 - 06:22 PM
It has about 5 hours on this thing - that's it. What's the first thing I should be looking at? Any links or otherwise would be great. I'm not a mechanic yet and have yet to even read the manual. Should I just take it to a shop and let them charge me - I"m assuming it's a minor issue. I don't know what a reed is, a float so I'm really at a loss. Got a lot of learning to do but haven't even got an experience riding partner to bounce things off yet.
Posted December 26, 2008 - 06:52 PM
Posted December 26, 2008 - 06:53 PM
Posted December 26, 2008 - 07:07 PM
Posted December 26, 2008 - 07:23 PM
if nothing works the carb may need to be cleened from just sitting but sometimes when mine dont start they need new rings but i dont think thats your problem in this case
Posted December 27, 2008 - 04:02 AM
Posted December 27, 2008 - 03:21 PM
Poor quality gas or not the bike has probably gummed itself up in the carb. After the first half dozen or so kicks taking the pluig out and kicking it through - this can help to clean out a flooded engine.
Posted December 27, 2008 - 03:37 PM
Posted December 27, 2008 - 03:51 PM
Did you ride it hard? Sounds like you are just starting out and the 2 strokes, especially the 125's, need to be ridden hard or at least revved high or can easily foul plugs. How does the plug look?
Don't take it to the shop. Even if you know nothing it is easier to clean the carb than to take it to the shop. But if you are rich and lazy.....
First make sure you are getting a spark. If not change plug. If you do have a spark then make sure you are getting fuel. Dont be worried about the carb just take it off and look inside. Remove a couple jets and poke small wire through them. If anything goes wrong come back here and you will be helped. But if you are rich and lazy....
Posted December 27, 2008 - 03:51 PM
Posted December 27, 2008 - 03:53 PM
If you are missing any of those it is going to be hard to start. even low compression will start if you bump start it. It will spin the piston faster than the preasure can blead off and it will fire.
Check that you have spark from your plug. take the plug out and hold the threadded part against a cylinder nut or something. kick (or use your had if you are by yourself and see if a spark is present on the plug.
then see if you have gas. Is the plug wet from all the kicking?
Compression barring any failure will probably be OK. I don't know the age of the bike or how many hours are really on the bike.
Even with those three item present it may not run well but you should be able to have it fire and run poorly.
Old gas can be an issue...but them you wouldn't be getting gas as the jet would be clogged with gass goo or a varish residual from the old gas.
Generally for me, if I have a cold bike, sitting a while. I have my gas on, lean the bike over almost to the ground until gas just begins to spill out the vent tube (1-2 seconds) and choke on, and kick.
Posted December 28, 2008 - 02:13 PM
Posted December 28, 2008 - 06:08 PM
Also, its wintertime in the Northern Hemisphere, so what are the current temps like in Yugoslavia? The reason that I ask is because your jetting could be totally off if you are trying to start in extremely cold temperatures.
Posted December 29, 2008 - 12:04 PM
Posted December 23, 2012 - 03:15 PM