Originally Posted by
särpet
Now it happens,iget first .65 sportster from ebay.
It is used engine,A little bit I was wondering a few things.
Engine was very dirty inside.
The cylinder is not round if you look at the grinding traces and scrathches?
Plug is very deep inside in sylinderhead? What plug is for sportster? Long os f ?
Normal iuse just engines medium plug.
Engine is without sylinder and head gasket?
Iput it together with gasket cement.
The majority of .65 Sportster engines have no gasket between cylinder and crankcase, and no head gasket either. The machining is very good and usually won't leak. If you want to run more than 5% nitro, you will likely need to make a couple head shims and shim the head up just a little. As for glow plugs; they're designed for long reach plugs. OS/Enya plugs are too short as you can see in your first picture. 4-stroke plugs are too long and likely not needed unless you're running the engine inverted. Even with an inverted engine, you shouldn't absolutely need an extended tipped plug.