Piston size G-1

[karnak]

Just picked up a used cart with no compression. Torn down the engine, the rings are so worn they fall through the cylinder. I ran the numbers and it appears to be a 1988 G-1 Gas. I measured the piston, it measures 2.675. Don't know if this is standard or over sized. Any info would be appreciated.

Read many posts, looks like a great forum.

Thanks

[smallblock450sl]

Originally Posted by karnak

Just picked up a used cart with no compression. Torn down the engine, the rings are so worn they fall through the cylinder. I ran the numbers and it appears to be a 1988 G-1 Gas. I measured the piston, it measures 2.675. Don't know if this is standard or over sized. Any info would be appreciated.

Read many posts, looks like a great forum.

Thanks

Manual say's, stock is 2.677 (68mm). I would be worried about the cylinder taper though. Does the piston skirt look scored and dark in color?, could be a sign the oil pump failed. You can yave the cylinder bored to an oversized piston ring set, but don't forget to change the crank seals also. Good luck and welcome to BGW

[slonomo]

I would recommend a new jug. I recently rebuilt mine and the cost of machining vs new was not that outrageous when I factored in two trips to the machine shop, magnaflux, rebore, hone, and a five day wait.

[karnak]

Thanks for the quick replies, with a close examination, it appears the oil pump was disconnected. I assume the previous owner was running a oil gas mixture. I may just experiment with the cylinder since I have my own machine shop and the necessary equipment to bore the cylinder. I will have to purchase an over size piston after the boring. I will start with the minimum which is .25 MM approximately 10/100, and see if the bore cleans up at that amount.

Smallblocker450sl: Do you have the specs for the piston to cylinder clearance.

[smallblock450sl]

minimum-0.035 mm (0.0014 in) ,max-0.050 mm (0.0020 in)

[karnak]

Thanks for the info. Let you know how everything goes. I am in no rush, since winter is coming.