I am having trouble getting the head off.i have tried wd40,engine assembly lube,motor oil,etc..............it is seized but i onlt need the block,crank,rod,and head.i am planning on modifying this for my 42" weedwhacker powered gas boat i have...............any idea's i coulds try to get this apart?
the head is unbolted.................let me know please and help me out here please.......i also need to know if this could be a G230 or a G260 block...............all i can find on it is 1850 on the block :freak:

try putting a flat head screw driver on the seam and tapping it softly all around then hitting it hard a couple times. the alluminum couldv'e corroded shut.

any other maybe safer idea's?lol :)

Try applying some heat to the head. Hopefully to will expand from the heat more then the cylinder and bust it loose.

I'm not familiar with the type of engine you are working with, but I assume it has a cylinder "jug" (head) on it like most other 2 cycles. I'll also assume that the jug is held on with 4 bolts.

If this is the case, try putting a cap full of Marvel Mystery Oil down in the cylinder and let it sit for several hours. After it sits for a while, take an air hose and blow compressed air down in the spark plug hole. This will put a steady even force over the piston and will pop it right out. Just make sure you have a pile of rags to catch the piston in.

I've used the Marvel Mystery Oil trick to free up several 2 cycle engines that were considered to be trashed because they were locked up. In most of these cases I was able to free the engine and make it run without any further work.

thanks to those who tried to help me.but i ended up buying a 25cc Homelite 2cycle engine my gas r/c boat............but i do still have this zenoah 1850 and would like some information on it if anyone has any at all....came out of a redmax weedtrimmer.professional series..but the red plastic housing was missing when i got it for free from the landscaping equipment shop i deal with.

smalblok355@aol.com

probally the best trick i know in this case is going to be really messy but what you do is , ,, find a fitting that will screw in the spark plug hole and put a grease zert in the end of it then put the grease gun on it and start pumping i have done this on alot of engines i had to do this one time on an oliver tractor 6 cylender to get all the pistons out its not pretty but it does work

Google Zenoah 1850 will get you a lot of info on that engine.