Maintain engine performance with the TORPEDO7 Compression Tester Set. Performing a compression test on a Motocross bike engine can tell you a lot and is something you should do occasionally.
First, it can give you an indication of how close you are getting to needing a top end freshening up and secondly it can tell you whether or not any problems you may be having with the performance of your bike, such as hard starting, or low power, are related to low compression.
This handy kit contains hoses and adapters for 10, 12 and 14mm spark plug applications
and includes a quick-disconnect with pressure-release valve, 300 psi gauge, and additional small engine tester with plastic carrying case, complete with instructions 

Whats in the Box:

• 2 ½” Gauge Readable Pressure range: 0 to 300psi 
• Specifications for adapters:
• M18 hose assembly: short thread
• M14 hose assembly: short thread
• M14 hose assembly: long thread
• Small engine tester (1.5-inch, 200psi) with a M14/18 thread
• Quick coupler with 1/4-inch NPT thread.
• M10 adapter with M14 thread
• M12 adapter with M14 thread
• M18 long reach with M14 thread
• Repair parts kit

Features and Benefits:

• All adapters and gauge feature heavy duty hose
• The 2-1/2" gauge has a dual scale dial with ranges from 0-300 PSI and 0-21 bar
• Gauge furnished with a protective boot
• Has a separate, very handy small engine tester
• Complete quick coupler for valve repairs
• Repair parts kit
• Neatly arranged in a plastic box with compartments forall parts
• Box Dimensions: 37 x 27 x 8cm
• Weight: 1.976kgs