just purchased a super tigre S-40 glow engine from a yard sale.manufactured in italy. i need to enlarge the prop hole from 1/4 28 to the next size bigger do i use a metric reamer or standard size can anyone help[X(]

That's strange. The Super Tigre web site lists the GS-40 as having 1/4 - 28 shaft.

jolly popper
i dont know if the engine being manufactured in italy has anyting to do with it or not ? tried atleast 3 different props still the same out come just a hair to small.

Harbor Freight as well as most automotive stores sells digital calipers for not very much money. They read in both inch and metric units. Once you have one, you will wonder how you ever got along with it.

The Super Tigre has a 7mm prop shaft with a 1/4-28 prop nut. You will need a metric reamer.

Don

I just keep both SAE and metric reamers on hand. I could use a good caliper in my shop though, Next road trip I will have to take a look, Thands Don.

I use a tapered reamer for them, run in from the back. It works for anything and the tapering doesn't hurt anything.

I always have SAE & metric stepped prop reamers in my field bag. Never fails someone needs to barrow a prop or try another prop and it wont fit. Start from the back side or engine side and hold the reamer stationary while turning the prop for the straightest hole.

thanks for the info about the prop reamer. merry christmas to all ,cant weight for springtime