Hi there,

I have measured the thread on mine and it was 8 * 1.5.

I am new to the GAS engines and needs some advise in this regard. I have two Kuritz engines, the one a 21.5 and the other 23 or 25, I do not know for sure yet. My problem is with the bigger engine. I got both the engines from a friend as is. The 21.5 is running as is and is not converted yet. The bigger one is already at a late stage of the conversion but I detect a rather huge play between the crankshaft and the crankcase. What I mean is if you look at the engine right into the shaft and push and pull on the shaft it has a very big play in and out, not between the shaft and the bearings. Now either my friend has the wrong parts together or he has left out same spacers somewhere.

I have checked the 21.5 cc and it has no spacers and no play. By the life of me I could not find a parts list to indicate if i need a spacer or not. Does these engines have a large paly like that or what? I would appreciate a answer on this.

Another question is: If I want to convert one of these two engines to glow fuel do I have to have the adapter for the glow plug, throw off the flywheel and use glow fuel instead of gasoline or is there more to it?