I was not running my Zipper @ 6300 but set to 5800 max. The bottom line is Cris the ULS Produces more HP AT THe same rpm than 105 Zipper. I should say from my observation because I have done no scientific measurement of either engine.
There is also the Bully Hawk kit from Ronnie Smith in Mississippi. I suspect that the pistons and cylinders are made by the same company for all of them. I do know that both Hal at Zipper and Ronnie at Bully are good to work with and will install them if you want but the install is straight forward. For a few extra bucks you can get the rings fitted and the pistons fitted into the cylinders which is what I did and recommend. I’ve installed both of the kits mentioned above, the Zipper on my own and the Bully on a friends and would say the install is identical. I think both are recommending now that your engine is 2006 or newer but you can ask them about that. Hal rates his at 105 HP but that is at 6300 rpm. I know when I swapped to a 100 hp ULS that I needed to increase the pitch on my prop. I can say it (the Zipper) was a big improvement over the 80 hp.
I did a little research on these and apparently they weigh over the limit out of the box. Are they more buoyant I don’t believe so and there have been issues reported with them. No personal experience with them although. I just installed EFI on my 912 to get away from all of the Bing issues, of course these have their own issued but I’m liking controlling the AFR WITH THE touch of the mixture knob.
Those sure look interesting to me. I spent sometime looking into 2012 Apex harness. I just completed putting EFI on my 912 ULS. EVEN With a “plug and play” setup it is still a big job. If I was still considering the Apex I would go with this personally.
I believe he has the exhaust on it now, if I get out to his hangar (another airport) I’ll snap a picture. This is obviously not a KF OR Avid. I think I have a picture of the Zenith Cruzer mount I will add to this post. Oops a Long Ear Bat resting for the winter here in a Wyoming cave. The muffler is just in view in the Cruzer mount.
I like them because they are less complicated and if properly designed easier to get the hoses threaded around. The ring mount would be my second choice if you find a used one but then you still have to build a mount for that. Once again this is just what I Would do, not necessarily the best way for everyone, just my own personal bias. I have a friend that built one, I’ll see if I have a picture.
Are you getting the oil tank, voltage regulator, exhaust system , radiator, OIL COOLER, air filters and etc with the engine? Dual throttle and choke cables work best IMHO AVAILABLE from McFarland or ACS. You might be able to get a mount from Kitfox. Or have someone local weld one up for you. The Kitfox and Avid mounts are not that pleasant to use, if I needed a mount I would have somebody build a bed style mount like Zenith uses.
I would get a length of 5/8” 4130 tubing either .058 or .065 the ID’s are .509 or .495 respectively. You might have to ream the .065 slightly but see what would work best with your axle. I used that tire on my Q2 it is not a tube/pneumatic tire but termed a semi-pneumatic tire. It worked very nice, wore well and handled great.