-Has an intermittent electrical problem & leaks air between cylinders where the two inward bearing lube holes are. The labrynth seal was not sealed...
2001 Blue Banshee 350cc with:
-FMF gold series pipes -K&N Filters -New Boyesen reeds
-New pistions and rings with 125 psi compression
-DynoJet kit metering needle #4 position, (four of six positions) this got rid of bog
-#340 main jets; plug chop looks good
-#27.5 low speed jets
-Will not idle, but runs great if you keep it revved...
-There is intermittent spark on the right side. Timing light does not flash all the time.
-The leak is in between the cylinders! Apparently that middle labrynth main seal is bad.
The cross-over tube is removed & plugs inserted. The exhaust ports are plugged to. Then I applied 6 psi into one cylinder, it blows out the intake of the other. I stretched a balloon over one intake, the put air into the other & it blew up the balloon!!! BIG PROBLEM DISCOVERED. This was a fast leak, not slow.
-Now its apart, not the first time. Looks like the middle seal was not sealing accross the small width between the lube holes for inner bearings, these holes are about 0.260 dia. & the laybrynth seal seal width is about the same... Shouldn't it be wider??? Ths engine has had the cases split before. There was lots of Yamabond in some areas & hardly any in the crankshaft middle area... We need more good mechanics.
-Anyone have a good used engine for sale???
::
David
