HPI Baja 5B #1 (OBR 5.5hp PROSTOCK Zenoah 4 Bolt 30.5cc)

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OBR 5.5hp PROSTOCK Zenoah 4 Bolt 30.5cc Engine

Right after Baja Fest OBR had a huge sale on their engines. At first I was planning to go all out and buy the 27.2 full mod long rod engine. But the problem is the cost of those engines. I just cannot see myself drop over $500 for an engine, that is not including tax (they are located in CA). So I picked something a little more modest, with the option to upgrade later.

Here are some Dyno sheets:

Custom Mods

Just like all the other 2 stroke engine I had in the past I always epoxy a screen to the lower engine case to keep out the large debris from entering the flywheel area. I usually put the screen on the outside of the engine case because it was easier. But the problem with doing that is how messy it looked. But this time I actually took off the flywheel and glue the screen from the inside. It took a little more time to do it but the end result really pays off.

HPI Baja 5T - OBR 5.5hp PROSTOCK Zenoah 4 Bolt 30.5cc Engine - Screen Mod

 

Cut part of a Hostile axle boot and used it as a seal for the carb’s throttle shaft

HPI Baja 5T - OBR 5.5hp PROSTOCK Zenoah 4 Bolt 30.5cc Engine - Carb Mod

 

Overkill RC billte coil spacer

HPI Baja 5T - OBR 5.5hp PROSTOCK Zenoah 4 Bolt 30.5cc Engine - Overkill RC Billet Spacer

 

GPM pull start cover

HPI Baja 5T - OBR 5.5hp PROSTOCK Zenoah 4 Bolt 30.5cc Engine - GPM pullstart cover

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