Hello, I am at a loss with my big bear. It has a hard time starting intermittently. It’s been like this for a little while now. Today me and my wife were out riding and now I can’t get it to start at all. In the past I have replaced the carburetor, ignition coil and plug, and oil changes. I am getting fuel to the carb, and getting good spark but no ignition. Is there anything off the top of anyone’s head that I could check?
thank you

 

Hard to start can be low compression and one cause is closed up valve clearances, check and adjust them, if they are not tight, check compression, it should be at least 90psi.

 

I bought a compression tester and did the test, highest reading I got was 105 PSI. I would think that would be good enough? Got fuel, got spark, and now seems like I have compression. I have been taking apart plugs and cleaning them out and putting dialectic grease on them. Still nothing.

 

Seems like the plug isn’t getting spark once installed. After a ton of reading, kind of sounds like “stator” is the issue possibly .

 

Get hold of the workshop manual. Yamaha give ohm readings for both trigger coil and "power coil". However I did have a 600 that read OK, and it still turned out to be a "power coil" fault.