• Become a Subscribing Member today!

    J3-Cub.com is the largest community of J3-Cub pilots, owners and enthusiasts. With over 1000 active members, we have fostered a vibrant community and extensive knowledge base.

    Access to the J3-Cub.com community is by subscription only. Membership is only $49.99/year or $6.99/month to gain access to this community and extensive unmatched library of knowledge.

    Why become a Subscribing Member?

    • J3-Cub.com hosts a library of over 13 years of technical discussions, J3 data, tutorials, plane builds, guides, technical manuals and more.
    • J3-Cub.com also hosts an extensive library of J3-Cub photos.
    • You will also receive two J3-Cub decals!

    Become a Subscribing Member and access J3-Cub.com in full!

    Subscribe Now

The big Wasp Jr?

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

bob turner

Well-Known Member
Jan 7, 2005
Reaction score
Yep - a 450 Stearman - Pratt &Whitney R-985

The question: We have backfires at idle that scared me badly enough that I had the owner shut down and tow it back. I believe it is an i duction system leak, since I could see flashes by my left foot, and nothing coming out of the exhaust stack on the right.

Maintenance has not been able to look at it, and I am not going to - but if any of you have had this experience, a few hints would be appreciated.

We got six hours in it before this happened, and it could be that our starting procedures need work. But man, once it gets going it is like a rocket-powered elevator.

Latest posts