新款7HP小松30.5CC obr手改

7HP FULL MOD ZENOAH 4 BOLT 30.5CC +3MM LONG ROD ENGINE

Full Mod - O'neill Brothers top of the line engines. OBR is proud to offer the first production long rod engine! OBR takes pride in innovating and not duplicating!

Just when OBR thought there wasn't any way to top their insane full mods Syndicate came along and gave them the power to do so. The long rod crankshaft along with some new porting allowed OBR to achieve 7hp.  With the higher reliability of the 4 bolt Zenoah engines they were able to achieve more power with out sacrificing reliability. OBR put all of the knowledge that they have picked up from years of dyno and field testing and came up with a monster. To start they completely tear down the engines and perform the following modifications:

To start they completely tore down the motor and did the following modifications:

• Machine combustion chamber
• Reshape piston
• Lighten the piston
• Relieve the piston to prevent seizing.
• Modify the intake port for better flow.
• Adjust intake timing to OBR specs.
• Resurface all ports.
• Modify transfer ports for better flow.
• Enlarge and reshape exhaust port.
• Adjust exhaust timing to OBR specs.
• Remove stock crank and install Syndicate 2mm stroker crankshaft with +3mm connecting rod.
• Install all new gaskets and c-clips when engine is assembled.
• Re-bevel all porting and stock bevels to prevent damage to the piston and/or cylinder
  

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就手改加上加长3MM曲轴，性能直追TS，价格500USD不到。。。。大家讨论讨论

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