Discussion in 'General RC Boating Forum' started by Vince Fantauzzi, Sep 11, 2019 at 4:40 PM.
Does anyone know where I can find a collett/shaft adapter for this engine?
the thread in the crankshaft is M6 (metric)!
You will need a screw M6 too.
Thanks, Joachim... Looks like they have them. And I guess I'll have to provide the screw to fasten it to the crankshaft. Appreciate the help.
My OPS 67 is 1/4 X 28 standard thread and is a stud. Cable nuts from Al Hobbs, Octura and lots of others
Hey, Brad the thread opening on this engine crankshaft measures 5mm...tried a 1/4 28 way to big...looks like maybe I need a 5mm screw?
Look broke thread need to replace new whole crankshaft
It used a 1/4-28 threaded stud IIRC...
i am sure its M6 metric
The minor diameter of an M6x1.0 threaded hole is 5mm. While I have no direct experience with that engine, I'd say Joachim is correct.
Titan Racing Components
Model Machine and Precision LLC
Gey a bolt and try it but don't force it
YUP, every one of them.......................
Well, looks like Joachim was right, it is 6mm. So I went to the local nuts n bolts shop and got a 6mm stud and it threaded in like a honey. Now I gotta get my hands a 1/4 shaft collett with 6mm threads. Anyway, thank you all for the help and suggestions.
Funny, I always thought they were 1/4-28 as that's what collets we used, same as a NR21.
Speedmaster does list them as 6mm tho: http://www.rossisales.com/Collet_Info.pdf
Vince, I have 3/16 and 1/4 collects came out of my old, old OPS67 stuff $20.00 ea plus $5.00 shipping, buy both and get a free drum valve intake free, $45.00 ps they are 6mm x1.0mm I am on way out the door, have race this weekend, but will be home evenings.
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