Originally Posted by
German Muscle
The original OS Speed Alum and MAG engines are discontinued and not really anyone has them in stock. The Speed Vspec 2 Worlds engine likely has no changes internally just a drilled head and someones name and World Champ written on it. I would get a JX21, There is a regular and a drilled head version. they are alot cheaper with the same performance and internals as the speed engines. Also i think the JX comes with a free XL T shirt.
The JX and Speeds do not have the same internals. One is 5 port and the other is 3 port. One has ceramic bearing, the other steel. The Speed crank is double slugged and filled, the JX has none of that. Only thing is that both have DLC coating. Adding to that, the JX rod looks like a Speed version, but doesn't have the poslished finish. This is what makes the differences in price. Also, JX I think only has one carb insert, 8mm or 7mm, depending if its a B01 or B01A, Speed has all 3 carb inserts.