Looper Shutdown with a rattle noise

[nymack66]

Ok I will pull the heads and see what exactly whats going on, Could it be a broken reed? Since I found lots of pre-mix oil in the Air baffle ?

[THEFERMANATOR]

A broken reed could have done the damage, but they normally window the block when they go through. Remember that a 2 stroke has 2 different compression sides to it, in front of and behind the piston. A compression test only measures in front of the piston and a broken or missing reed won't affect it unless when it broke it went through the engine and damaged the piston or cylinder. Unfortunately though your compression numbers along with the noise is a bad sign, and most likely means that boring and new pistons is in your future. You may be able to clean them with some acid and put just pistons in it, but I'm not normally that lucky. My 140 looper pops at 150-155 pounds of compression, so that should give you an idea of how far down you are. When you pull the heads look for smeared spots on the cylinder walls, that will be the aluminum from the pistons. It is possible on the looper engines though to pull the pistons out with the powerhead still on the mid.

[reelapeelin]

Another source of a rattling noise could be magnets coming loose under the flywheel...but that would not explain low compression...Ferm's probably right...as usual

[THEFERMANATOR]

Originally Posted by reelapeelin

Another source of a rattling noise could be magnets coming loose under the flywheel...but that would not explain low compression...Ferm's probably right...as usual

140's didn't suffer this problem as the magnets in them are encased into the flywheel(not epoxied like the 35 amp flywheels), unless somebody installed a 35 amp V6 style charging system.

[reelapeelin]

Originally Posted by THEFERMANATOR

140's didn't suffer this problem as the magnets in them are encased into the flywheel(not epoxied like the 35 amp flywheels), unless somebody installed a 35 amp V6 style charging system.

Didn't know that re the V-4s...yer right...it did happen on my V-6

[Skools Out]

well you can still have a 140 with loose magnets, i have a pair of 140's that both have the 35 amp system and had to re-glue the magnets. never seen them on any 120 / 140 except a 25 inch motor, i've never seen them on a short shaft even though the manual says they made them.

[THEFERMANATOR]

The sea-drives all had the 35 amps systems as well, but not many 120/140's did. I've considered finding a blown V-6 and swapping the stator and flywheel over to my 140 to get the higher output charging system. The factory charging system on the early V4 loopers SUCKS! I got a whopping 1.3 amps at idle, and 3.6 amps at 3500. 5000 got me up to 6.3 and 6100 got me 8.56 amps(I guess just enough to call it a 9 amp system). This was with a new stator and rectifier.