Man, I was hoping to don't used The Jr matchbox, but with Jr servo, that's the only way to adjust Jr servo, should had used all Hitec servo

I a 3m yak 55 and I'm installing a 3w-140 , I have never mounted any thing this big before, any thoughts on how. Do I use stanoffs ? Thanks

What I do is use the engine cowl, mount the engine cowl down, then measure from the front mounting plate to the end of the cowl, allow clearance for the prop and spinner, then measure the engine, from the back engine plate to the front hub of the engine, subtract the number, and that will give you how long the standoff should be, I hope this help you.