The gearbox could be flipped upside down on this Phazer adapter and it's not from Mohawk. It is designed for the SPG-4 gearbox.
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Please allow me to express a few thoughts on this product and post without being perceived as going on the attack or being prickly and argumentative. I'm just trying to provide some good info that is not just plain reliable, it is first-hand (not rumor) and mostly common sense.
I have been dealing with Vlad Serg continuously for 4 years - longer than anyone in the Western Hemisphere - and had numerous problems...no need to air dirty laundry here. He sent me his first Apex adapter like this one for review last year. I found several serious flaws before shipping it back to him - only to discover he simply turned around and sold the unit to some other unsuspecting fellow here in the west. I feel sorry for that guy.
1. As-built the gearbox prop shaft was located on the wrong side of the crankshaft, so for final installation the entire engine (~145 lbs.) wound up on one side of the prop shaft. Not an ideal build.
2. At first glance you can simply flip the gearbox upside down, right? Sorry, but no.
- First, if the prop shaft is actually in the right place on this Phazer adapter (giving Vlad the benefit of the doubt that he took my advice and eventually figured out how to position the gearbox at the correct angle in order to have the prop at or close to the vertical COM of the motor) the prop shaft is not going to be in the same vertical alignment.
- Second, if you know anything about these Airgear350 Type B gearboxes (a.k.a. SPG, SPG4, and AK7) then you know the holes are asymmetrical. That's right, they are NOT symmetrical, like a Rotax C, etc. The only two holes that are symmetrical are at 3:00 and 9:00. The rest are hit-and-miss, the top two being not even on the same radius as the bottom two. Nowhere even close to the bottom, completely different, and I've found that each individual hole will vary up to .030" from one gearbox to the very next. As for me, I locate, punch, drill and thread each adapter gearbox mounting hole to match each individual gearbox that I sell to insure the best possible fitment. In other words they are sold as a set.
3. There are basic mounting differences between a Tango SPG, Air Trikes SPG4, whatever Vlad is selling, and a Mohawk AK7. You can't just expect to interchangeably slap any of these gearboxes onto any old adapter and have it aligned, let alone fit the holes. I order my Mohawk AK7 (Airgear350 Type B) gearboxes specially cut at the same time the bearing housings are cut from the cases, with an alignment groove that precision fits the Mohawk adapter to insure a perfect centering alignment of the engine PTO and PSRU drive pinion. If you go out and buy the standard "SPG4" it will not fit this Vlad adapter, or a Mohawk, and it will not align perfectly with your PTO shaft unless you go to the time, trouble and extra expense of making a tool to align your engine and gearbox together. Now I am betting Vlad is ordering gearboxes with a similar groove pattern as I am, to align them on his adapter to the PTO. One would hope, anyway.
4. Bottom line: Vlad is in Moscow. If you have a problem, consider this: I have been waiting since last June for gearbox parts from Vlad, finally got tired of dealing with him and went back to Vasilli at Air Trikes. I have been waiting since November for gearboxes we ordered together. Blame it on COVID, blame it on whatever you like, but this is the reality we are all dealing with.