Hi. I purchased a .82 Saito engine and I attempted to attached a Tru-Turn spinner. The hobby shop rep sold me the adaptor set along with the spinner.

I attached the adaptor according to the directions (although I was little unsure), but when I installed the cone retaining screw the cone didn't lock down. I was still able to swivel the cone. The cone should be stationary, correct?

Could I have the wrong adaptor set?

I assume that you are screwing the screw as far down as it will go, right? If that's the case then it's as simple as the screw that goes through the spinner is just too long. Use a dremel (or a hack saw if you don't have a dremel) and cut a little bit off of the end of the screw. This will give you enough room to completely tighten the screw down on the spinner, and keep it from slipping.

Hope this helps

Ken

foosball, I had the same problem with my Saito 100, and Ken and Bruce both told me the same thing that Ken just told you. What I did is screw in the screw as far as it would go into the nut, then marked the last thread I could see. I unscrewed it and cut off that much of the screw with a Dremel, from the mark I made to the end. It worked perfectly after that.

Makes sense.

Maybe you can also clarify the correct order to install this adaptor.

I put on the backplate, then item #1 (see attached photo) followed by the prop. Then the #2 washer. Now I put on #3.

Should I tighten #3 down completely and then put on #4?

Yes, tighten down #3. I like to use two 1/2" wrench to tighten #3 AGAINST #4. That's how the #4 jam nut works to prevent the prop from throwing in the event of a backfire. As mentioned above, shorten the cone attachment bolt. You can estimate how much to cut off by estimating the free play between the cone and bolt. Do not overtighten the bolt against the cone and this might deform the cone. I like to apply a drop of blue loctite on the tip of the bolt.

http://www.truturn.com/cgi-bin/store...dapt0717a0716a

I think you should have the TT-0716A adapter if your prop hub is less than 1/2" thickness, or the TT-0717A if it's more

Thanks rajul.


Yes, I noticed this on their website last night. My prop is exactly 1/2" thick. Perhaps that other adapter will work better.

Although, shortening the retaining bolt seems like it will work.

But that sure doen't seem like a lot of strength to hold the spinner secure when I attempt to use an electric starter on it. Especially since they strongly suggest not over-tightening the retaining bolt. Do these these unscrew easily?

I have a 2" ultimate spinner (wide blade), TT-0716A adapter, with an APC 14x4W on my FA82. No issues at all with an electric starter. As I said, I use a drop of loctite on the bolt, but I know many others who don't and they still work well. I like to be on the safe side

Just having the retainer screw "snug" seems to work fine when using an electric starter. My Big Stik 60 has an OS 91 Four Stroke and a Tru-Turn spinner. The cone has never moved when using the electric starter. I went to the hardware store and bought a bag of 10-32 screws in a bunch of different lengths. I prefer finding one that works without cutting, but that's probably just laziness on my part.

It's not the screw that keeps the cone from rotating when the starter is applied. It's the contact friction area between the rear of the cone and the backing plate and just a tad of the screw. The screw merely applies the pressure against the backing plate.

Think of the screw as the hydraulic fluid in your car brakes. It doesn't stop your car but pushes on the brake pads that do.

I took the engine, prop and spinner to my local hobby shop and the rep trimmed the retaining bolt. Voila! I love having a hobby shop five minutes from my job.