Most Recent Discussion:
Posted by vegasrett on Sun May 24, 2015 11:24 pm:
just did mine last weekend with oldman's post.
didn't need bushings. will recommend springing the $2 for the seal retainer clippy things. mine went back in after a lot of polishing but they sure came out a nasty looking mess. would have been worth $2 to just slap a new set in.
all and all it's true. this project is nothing to be afraid of.
Posted by radare on Sun May 24, 2015 11:07 pm:
I had some time this evening so I disassembled the engine and separated the cases. While cranking the engine to remove the crankshaft bolt, I noticed it binding up a bit as I turned it over. Since the plugs were out, I knew it wasn't compression. Once I had the cases split and had good access to the starter gear, I could see damage. The previous owner managed to bend the starter gear in four places. Nice. $176 later (enjoy, Ron Ayers), I have new gears on order.
Posted by radare on Sun May 24, 2015 10:52 pm:
I can't stress this point enough: If you have problems with the bike flooding, replace the petcock, the float needle valves and the needle valve o-rings. Don't cheap out and install a manual petcock or try one of those iffy rebuild kits. Buy a genuine Yamaha vacuum petcock and replace yours with it; after all, yours is likely 20-25 years old at this point. The petcock runs $65 from Yamaha while the needle valve and o-rings are another $40.
This is the starter clutch gear from PBT. A previous owner (we'll call him, Dick), evidently had problems with the petcock and managed to bend a couple of the teeth. This resulted in the bike not cranking smoothly and occasionally binding up. A replacement set of gears will cost $170. Associated gaskets to replace them will be another $278. If that PO had spent the $70 on a new petcock, it'd have saved me nearly $450 in parts costs plus at least two 12-hour days of engine work to replace the stripped starter gears.
Starter clutch gear at first glance:
Teeth are bent in at least four places:
Close-up of the bent teeth:
For your typical Seca II, this can be a death-sentence. There really is no excuse for this anymore, either. It's a well known weakness in the Seca II engine and one that we know the cause of. Do not take a flooding bike lightly.