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OBR Race Ported Zenoah 4-Bolt 36mm 29cc Top End Kit

$129.00
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SKU: CC280

ABOUT THIS PRODUCT:

OBR Race Ported Zenoah 4-Bolt 36mm 29cc Top End Kit

About

About

It's now here, due to popular demand! OBR Now does the porting work on these kits!


These big-bore kits have been OBR race ported - intake, exhaust, and transfer ports have been enlarged/reshaped for more fuel/air flow and hence more power.

This is the long-anticipated 4-bolt Zenoah 36mm 29cc bigbore kit! This kit will fit Zenoah G240RC/G270RC/G290RC engines, or any engine running the 4-bolt Zenoah cases. This includes the parts shown (piston, cylinder, ring, spark plug, base gasket, c-clips, pin)

This 36mm cylinder is for use with the standard 28mm crankshaft. We also offer modified kits to accommodate the +2mm stroker cranks.

This is a race ported version of Zenoah part # 966508401


OBR has submitted the following information for this item:

CNC ported and hand finished
All ports resurfaced and sanded
Exhaust duration/timing increased and port widened
Eyebrows cut on intake side transfer ports
Piston relived to prevent seizing at high operating tempuratures
Intake skirt on the piston is cut to increase intake duration/timing
Compression set for 91-95 octane fuel. Running race fuel can cause detonation and damage to the top end.
Cylinder decked to raise compression and tighten squish clearance. The stock cylinder gasket needs to be used. Running a thinner gasket or no gasket at all will raise compression too high and/or cause the piston to hit the combustion chamber
Compression set for 91-95 octane fuel. Running race fuel can cause detonation and damage to the top end.

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