Reviews
For advanced players! Bowling/Honing Additional Work Required! High-octane Spec.
I purchased this for my JA10 light motorcycle registration.
As a conclusion, the Bore Up Kit cannot be used as a stand-alone unit, and additional work for bowling and honing is required.
The clearance between the Piston and Cylinder is very narrow and will cause the Engine to blow if assembled as is, such as if the Piston gets stuck.
As a countermeasure, take this Bore Up Kit to an internal combustion engine shop for additional work to achieve the proper Clearance, which will be immediately apparent when this product arrives in your possession.
Although not mentioned in the product description, the Bore Up Kit increases the compression ratio to approximately 12.1:1, making high-octane gasoline a must for sure.
The problem is that I am a little concerned about whether the engine of JA10, which is famous for its failure, will be able to withstand such a high compression ratio.
Also, the ValveHit on IN and EX, which was a concern, did not occur.
So far it is working fine, but it is still in the break-in stage, so I would like to review it again somewhere after some driving.
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