I recently picked up a 2010 TE450 with 102 hours and 2100 miles. While the bike was obviously ridden like they are meant to be (dents, scratches, etc...) it seemed well cared for. After going through the bike and replacing most of the wear components and checking valve clearances and such, I started riding it. From the day I picked it up, it seemed like the starter was "weak". I ruled out the battery, wiring, relays, auto-decomp, etc... It continued to be very difficult to start on the button. Didn't bother me much since it would start on the first kick, whether cold or hot.
The last ride, the starter just up and quit completely, no biggie finished the ride with the kicker (why manufacturers don't put a kickstart on new bikes is beyond me). Now I had a reason to pull the starter, and I just happen to have a spare one in the box of parts that came with the bike. Pulled the old one out and opened it up. The brush springs were rusted, one of them was actually broke in two pieces. The brushes were also gummed up with what appeared to be very silty mud. The weak rusty springs weren't pushing the brushes against the armature strong enough for current to flow. I dropped the new starter in and the bike blipped to life immediately when I pressed the magic e-button. I plan to rebuild the old starter and keep it as a spare.
I guess the point of this post is a public service announcement of sorts
The starter is not sealed against water/mud, and the steel springs are definitely vulnerable. Slow starting and/or hanging on the compression stroke, might not be a sign of bad battery or failing auto-decomp cam. Check the starter, it might be on it's way out...
Happy riding!
The last ride, the starter just up and quit completely, no biggie finished the ride with the kicker (why manufacturers don't put a kickstart on new bikes is beyond me). Now I had a reason to pull the starter, and I just happen to have a spare one in the box of parts that came with the bike. Pulled the old one out and opened it up. The brush springs were rusted, one of them was actually broke in two pieces. The brushes were also gummed up with what appeared to be very silty mud. The weak rusty springs weren't pushing the brushes against the armature strong enough for current to flow. I dropped the new starter in and the bike blipped to life immediately when I pressed the magic e-button. I plan to rebuild the old starter and keep it as a spare.
I guess the point of this post is a public service announcement of sorts

Happy riding!