JLO 295 problems

[ctyesterday]

I have a jlo L295 I am working on that sits in a terra tiger. The boss recently picked this thing up and has no idea how long it has been sitting. I rebuilt the carb because it would barely run. Now it runs decent at idle but when I throttle it up it falls on its face. When I release the throttle I have to re adjust the low idle screw. It almost sounds like the timing is off when I get on the pipe. I checked the compression and I am only getting about 92psi. I don't know if that is too low or not for a 2 stroke. Any help would be appreciated.

[Don]

92 psi is awfully low for a well running 2 stroke. I usually start a top end rebuild before it falls to 100.

[countrybumpkin]

Surprised it even starts at 92 psi. Are you holding the throttle wide open when you check compression? What kind of carb is on it. Hope it isn’t a Tillitson.

[ctyesterday]

It has a Tillotson hr68a. I hear they are a nightmare to deal with. I pulled the engine apart and the lower cylinder wall looks pretty rough. I am going to do a rebuild. Any Idea where to get an oversided piston? Looks like it will definitely need punched out.

[ARGOJIM]

I probably have a piston and gasket set.

[Rodbuilder]

I'm being really "general' about this, but any engine needs at least 160-180 psi compression to run like it should.

92 pounds just isn't going to get it!!

Tear it apart.....hone the cylinder with a cheap 'ball" hone (AutoZone!) and give the cylinder 15-20 strokes with it, Keep the cylinder wet with some spray oil, or a few drops from an oil can. WD-40 is NOT oil!!!

Put a new set of rings in it and fire it up!!! I al;ways use 91-93 octane in anything with under 4 cylinders in it!!!