I have the Highwing gear on a kitfox and the only improvement I could see other than a better Spring setup ,would be to have the wheels about 4 inches further back.If you can make it fit ,it will be great improvement on the original gear.
I had a similar situation were the pinion screw came undone.It came to my attention when doing an oil change as there was a lot of metal on the plug.The shim(shims?) had failed due to the hammering at idle,it had been loose for so long the screw had a flat spot worn in the threads from rattling around.We cleaned it up and had a few extra eyes look it over.there was no gear or bearing damage visible.An oil change was done at 10 and 20 hrs with no metal visable on the plug.These boxes are tough! The only giveaway the problem in hind site was a rough idle below 2000rpm and the start was a little slower.
The KF 4 (small rudder)seems more stable in rough air, whereas the 3 needs constant rudder correction to counter the eileron inputs.If I was to rebuild my 3 I would consider the conversion.The big tail 1200 fox is a major leap forward in stability also. As a side note the performance of the 4 v's the 3 with a 582 is the same in all areas.
Can you hear the variation between left right (or front back), tacho error is normal . I tell 582 newbies the best place to look when doing a mag drop test is out the window! if there is a noticeable difference,plugs is the first item to look at as it gets more involved and expensive from there.
Its a late 670 with the ignition pickup at top.The cranks are even different to the early ones. I'm not sure how easy it is to convert the later ones to dual ignition.The early 670's have provision for dual pickups. The later engines arn't as easy to mount a gearbox to (welding required).I can't get enough detail from these photos to be sure on this one.
One of my Skystar fox labels was looking a bit tatty so I removed it.The glue stayed behind and isn't in a hurry to be removed! Any ideas? I believe the paint may be aerothane on polyfibre?petroleum has removed 90% .