Echoboy86
ArboristSite Member
PORT THE LIVING HELL OUT OF IT!!! THATS WHAT!!!
Here's a short video of the finished product.
I had a major problem with this saw about 6 months ago. I rebuilt the saw with Meteor piston and an aftermarket long block from an Israeli seller off of Ebay.
The Quality of these cylinders are top notch with nice port shapes and brilliant chrome plating and I would recommend them to anyone wanting to rebuild one of these saws.
Anyway, I bought new bearings, seals, intake boot and impulse pipe and oil pump and once it all arrived (which always seems to take forever when you really want to get a saw up and running,) I set about putting this Jonny back together.
I got the saw all buttoned up and (impatiently) fire it up..... to my great disappointment I couldn't get my idle speed below 4000rpm. MAJOR AIR LEAK!!! I hear you all shout, and that's exactly the conclusion I came to, as there was no difference to the rpm when I attempted to tune it down.
Sooooo, pull her down again and reseal and button back up again, with the addition of pressure vac test this time, and what do you know...... still leaking around the top of the bearing pockets
Well crap!!! just what I need
The leak was directly at the top of the bearing pockets where the lower transfers meet the top of the bearing pockets. The problem is that there is no shoulder to pinch down onto the crank seal at the base of the lower transfer. so, how do we over come this???? Enter Permatex metal putty!!! I used this wonderful product to create a small ramped bridge to not only bear down on the crank seal but, I all so helps create a gentle curved transition for the fuel air charge to entre the lowers.
Well it worked a treat! I also ported the cylinder while I had it apart and welded up the Meteor piston and turned a .074 thou popup. I also added the WT-657-1 carb which has a bigger jet and venturi compared to the standard WT-289-1 that came with the saw.
Then product is the saw in the above video. I hope you enjoyed this little story.
I 'll post some of the build photos tomorrow.
Sandy
Here's a short video of the finished product.
I had a major problem with this saw about 6 months ago. I rebuilt the saw with Meteor piston and an aftermarket long block from an Israeli seller off of Ebay.
The Quality of these cylinders are top notch with nice port shapes and brilliant chrome plating and I would recommend them to anyone wanting to rebuild one of these saws.
Anyway, I bought new bearings, seals, intake boot and impulse pipe and oil pump and once it all arrived (which always seems to take forever when you really want to get a saw up and running,) I set about putting this Jonny back together.
I got the saw all buttoned up and (impatiently) fire it up..... to my great disappointment I couldn't get my idle speed below 4000rpm. MAJOR AIR LEAK!!! I hear you all shout, and that's exactly the conclusion I came to, as there was no difference to the rpm when I attempted to tune it down.
Sooooo, pull her down again and reseal and button back up again, with the addition of pressure vac test this time, and what do you know...... still leaking around the top of the bearing pockets
Well crap!!! just what I need
The leak was directly at the top of the bearing pockets where the lower transfers meet the top of the bearing pockets. The problem is that there is no shoulder to pinch down onto the crank seal at the base of the lower transfer. so, how do we over come this???? Enter Permatex metal putty!!! I used this wonderful product to create a small ramped bridge to not only bear down on the crank seal but, I all so helps create a gentle curved transition for the fuel air charge to entre the lowers.
Well it worked a treat! I also ported the cylinder while I had it apart and welded up the Meteor piston and turned a .074 thou popup. I also added the WT-657-1 carb which has a bigger jet and venturi compared to the standard WT-289-1 that came with the saw.
Then product is the saw in the above video. I hope you enjoyed this little story.
I 'll post some of the build photos tomorrow.
Sandy