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Explanation: Let's talk about the 4 basic types of Briggs engines that we deal with in kart racing.
The most sought after would be the double bearing cool bore, an aluminum bore motor with a roller bearing on both sides of the crankshaft. Hard to find.
Next is the double bearing IC (steel bore). Both of these are very popular and both have won a lot of races.
The other group includes the single bearing cool bore and the single bearing IC. These have a roller bearing on the power takeoff side and have either a plain bearing or a DU bushing (teflon impregnated bronze) on the flywheel side.
Any of these 4 types of motors can be fast and win, if properly blueprinted and maintained.
Now, let's build a competitive motor piece by piece.
In the days to come we'll be trying to update this section. We realize that parts of it are a bit dated, but lots of the information here is still good. Thanks--- Bob E.