Join Date: Aug 2014
Location: Northwestern Indiana
Raptor 660... I'm lost...
I full serviced my Raptor 660 last week including a carb clean. It ran fine before other than a few carb issues. Now it doesn't want to start. It turns over once, then stops and clicks the relay. Or if it's not close to TDCC, it'll turn over fine. Or if the spark plug is out, it turn over fine. It also has a loud tick to it, and when you give it throttle, after about 1/4 it just tries to die.
The jets in the carbs are all the same sizes as what they were before. I've checked the valve clearance three times now, every time they were in spec. 0.10mm intake, 0.15mm exhaust. The starter clutch is working correctly. The timing chain has more than half the distance on the tensioner to go, so the timing chain is plenty tight. The battery drops to 10.5 to 10.75VDC if it turns over, and if it doesn't it drops to 5-7VDC. The starter when it's unloaded completely only drops to 11.75VDC. The decompression pin seems to be working. Push the weights in, and the pin pulls into the camshaft like it should.
I don't get it. What else could it be? I'm a Certified Yamaha Technician, and I'm completely lost. What am I overlooking? I can't think of anything.
Btw... It's a completely stock motor. The only upgraded part is I just put a K&N air filter in it during this service.
2016 Yamaha YFZ450R SE, 2009 Yamaha YFZ450R SE (SOLD!), 2007 Yamaha YFZ450 SE (SOLD!)
2002 Yamaha Raptor 660R SE
2012 Yamaha YZ250F, 2003 Yamaha YZ250F
1993 Suzuki LT230E
2003 Polaris Trailblazer 250
2013 Harley Dyna Street Bob, 2003 Harley Dyna Wide Glide 100th Anniv. Edition