RE: Valley View RC Brand Engines
I'll try to answer some questions here. Yes, the rods have rollers at each end. Valley View acquired exclusive rights to the XYZ 20 and 40 twin. The engines will no longer carry the XYZ name, they will now say VVRC on them. The XYZ name could still show up on a new design, but the 20 and 40 will only be Valley View. The XYZ 40 twin was pretty much still-born due to the straight plugs. The first thing VVRC did after acquiring the rights to it was to have the factory retool for angled-plug cylinders. Not cheap, but at least it will now fit into most cowlings on 30cc sized airplanes. Sales of the DLE 60 twin are said to be sluggish, probably due to it's straight plugs making it wider than it needed to be. Personally, I'm waiting for a DLE 70cc twin based on the 35's jugs, which already have angled plugs. My 35 is a real powerhouse.
The first XYZ 40 twins, (straight plug) of which mine is one, ran fantastic. All they needed were angled plugs to get the width down to a reasonable figure. Valley View has been selling the XYZ 20 for quite some time now, and it has been remarkably trouble-free due to the factory's excellent consistancy. When test-run prior to shipping, all of the engines give very similar performance. A lot of Chinese engine brands vary wildly from one engine to the next, but XYZ managed to avoid that problem by maintaining a high level of QC.