Leaf Shims...

[Fl_Richard]

I'm in the process of rebuilding this 1995 150 looper. I'm installing new leaf plates as part of the overhaul. I did one side and as I started on the other I noticed a shim in the stuck to the old plate. I looked through the other leafs and sure enough thereare two more shims. So I have six assemblies and three shims..

Where did they go. My Johnson manual says ...assemble leaf stop and shim (if required)" When is it required? And for what cylinders? Did I screw up or what?

Thanks all

Richard

 

[Dhadley]

Re: Leaf Shims...

At some point the stock steel reeds will start to flutter. As they start to flutter you won't gain rpm anymore, like hitting a wall. The theory is that if one side was shimmed it wouldn't flutter like the other side and the r's would continue on up. Now, remember these are the same reeds in a crossflow, that's where all this came from. The crossflow V6 stock steel will start to flutter about 6300 or so. Those same reeds in a 60* looper will go right on up to 6700.

Boyesen reeds will go right past 9000.

 

[Fl_Richard]

Re: Leaf Shims...

Sooo.... I have 6 reed assemblies (12 plates) and three shims. Where do the three shims go?

 

[Dhadley]

Re: Leaf Shims...

To be honest, it doesn't matter unless you're trying to get rpm higher than stock. Someone may have changed some assemblies or they may have never been there from the factory. I'd put the 3 you have on 3 assemblies and go with that. You can order the shims and put them in the other assemblies too. 323412 is the number.