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Join Date: Nov 2007
Location: Chandler, Arizona
Ok, just for reference, you are missing something. It takes FOUR things to make an engine run. Fuel, compression, and a spark AT THE RIGHT TIME. Your ignition timing has to be pretty close. A spark during the exhaust stroke is pretty worthless, even though a lot of engines have one.
But those are just the basics. It gets a lot more complicated. You have to have almost exactly the right air/fuel mixture, a really good spark (at the right time), the starter has to turn the engine over fast enough, ect. Some engines are very temperamental about starting, because their design puts them on the outer margins for what is needed to start and run, so there is no room for any errors, everything has to be perfect. Other engines are much better designed, and have more room for variance.
My new EX500 starts so fast you never even here the starter. My Vulcan 750s, both of them, have to be turned over several times before they will start, and have always been that way, since new. I will try the iridium plugs next time I change them, but spark, compression, air/fuel, and timing seem to be fine. But, that is checking the spark outside the engine. It may not be nearly as good under compression.
Also, I have always removed the clutch and sidestand switches from every single bike I've ever owned that had them, after having had one fail. I leave the engine cutoff switch, but if it failed, I would probably not replace it. I have never needed one on a streetbike. Jerry.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike