Hello! So l own a NT650V from 2001.Started having loss of power until one cylinder quit working completely,changed the spark plugs it was like new then in 2 months same thing happened,gradual loss of power until the cilinder stopped working(same cilinder).Pulled out the spark plugs and they're soaked in gasoline.I was wondering if it could be the ignition coil or something else?
Could it be electrical?
- Thread starter greenmoon
- Start date
That is a sign that is no spark present. There is also the possibility that the carburetor feeding that cylinder has an issue and sends too much fuel into that cylinder.
You should check the engine oil to see if it smells like gasoline or petrol. This would be a sign of a bigger problem.
Take out both spark plugs. Reattach the spark plug wire that runs from the ignition coil to the plug. Hold the spark plug wire, hit the starter button, and touch the spark plug end to a metal part of the bike. You should see a spark jump from the plug to the metal part. If not, you have a failed ignition coil or discontinuous spark plug wire.
Spark plug caps, which are known to be a problem with the NT, are not expensive and would be a good thing to change. Over time, the resistors in them give out. Usually starts acting up after the bike gets warmed up however can just fail.
And the cilinder starts working if l go at high rpms(about 6000-6500)for a period of time.I haven't noitced the oil to smell like gasoline or stuff like that.I already bought replacement ignition coild but was wondering if l should check something else as well.
Spark plug caps !
Don't overlook the plug wires too, on this bike they are solid core wires, the wires can develop cracks in the insulation and the high voltage leaks to ground instead of firing the plug. You may be able to spot the high voltage leaks by running the bike outside in the dark.
Typically on Honda motorcycles of this vintage, the wires screw into the coil, engaging a threaded pin at the coil output. A quick web search turned up this wire available in bulk.
Typically on Honda motorcycles of this vintage, the wires screw into the coil, engaging a threaded pin at the coil output. A quick web search turned up this wire available in bulk.
If you have access to an ohmmeter, you can check the resistance of the plug caps, I believe the standard resistance on the NT is 5k ohms but don't quote me on that. Some NGK caps have the resistance printed on them.
If you purchase new ones, you could compare reading old vs new. The exact reading is not of utmost importance, mostly you would hope to find one very high, for example 20k or more on the suspect cylinder, essentially confirming your diagnosis.
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Running some fuel injector cleaner through the engine may be a good idea. You could possibly have a sticking injector on that cylinder.
It's carbureted though...it's the 650.
Duh!
Carb floats can be tricky like anything. I had a Kawasaki Concours that had float issues. The float on that was split with 2 separate floats, one on each side of float needle. One float floated and one side sank. It took me a while to find that but it was quite obvious when I set the floats in a can of gasoline.
Arknt
Edit: I think this was on a Yamaha 750 Virago, not the Kawasaki Concours.
Arknt
Edit: I think this was on a Yamaha 750 Virago, not the Kawasaki Concours.
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Here is a 650 workshop manual. https://www.carlsalter.com/mcpdf/Honda NT650V Deauville-workshop-manual.pdf
I guess you could start with the easy stuff, and test the coils and the pulse generators.
I guess you could start with the easy stuff, and test the coils and the pulse generators.
Try this link for the manual. https://www.carlsalter.com/download.asp?p=1964