SOURCE: crank no start yzf 600r
Inject some carb cleaner spray through the opened air filter while cranking.
Spark plugs work? timing on the camshafts ok?
Crank it without turning the throttle on.
Pull the choke cable if you need to.
It should fire up without throttle.
Use the carb cleaner spray to help it (don't spray too much.It will backfire from the carbs).
SOURCE: engine wont start
The spark plugs if they are blackish it means rich on mixture and thus they have fouled up and will give you hard start. If they are brownish whitish tht means they are ok, and if they are whitish means the engine is running lean.
Since you checked the the fuel pump and after removing the pipe fuel gushed out it proves tht the pump is functioning.
Getting back to spark plugs....remove one of the spark plugs and earth it on the cylinder head somewhere and fix the lead head to it and thn crank start the engine and see if theres good bluish sparks at the spark plug.
I would recommend you first to examine the spark plugs , replace them if necessary and try to start it.
Hope this helps!
SOURCE: runs poorly, feels like miss fire, sometimes runs good(rarely).
You can do a continuity test on your coils and plug caps as follows:
1:Disconnect the coil connector drom the wiring harness.
2:select (O x 1)
3:put tester + lead on red/black terminal and - lead on orange(grey)terminal.
4:Your primary coil resistance should be between 1.87~2.53O at 20C.if OK proceed to step 5.
5:Select ( ωx 1k)and check secondary coil resistance(between the two HT(plug leads)this should be between 12~18 kωat 20 C/86 F).
You can also check sparkplug cap which should be 10k.ω
This is just a basic check but I would do is remove plug lead from the offending cylinder ,take up the revs and see if the miss-fire has gone.If so swap your coils around and see if missfire occurs on the other cylinders.If not your coils are OK.
If the missfire is still now only occuring on the one cylinder then you need to do a compression test()and if OK remove carbs and check also the inlet rubber manifold(for cracks ,seating etc.)and then service them.
Once off you can also see if the butterflies are in sinc.But do these simple tests and if you have a problem come back to me.
SOURCE: 2002 yamaha 650 vstar classic wont start, i
If you are not getting spark then it would be the CDI box, Coils, Pickup trigger in Engine.
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