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Nsr250, Leak Down Tester kits, for sale.

Leak Down tester kits for the Honda Nsr250 bikes can now be purchased via my online store.
The tool will fit the following models : 
MC18 MK2 
MC21 (all)
MC28 (all)

The leak-down tester is an essential tool for any high performance two stroke engine. This kit is installed in place of your carburetor and by pressurizing the engine cases you can check for any air leakage due to worn mating surfaces, erratic torque values due to aged parts, worn crankshaft seals etc. It is a necessary evil that it will help prevent catastrophic damage to your engine and keep performance up. A very valuable tool for a two stroke engine, handmade with care. 

Directions of use: 
Testing can take place after a newly assembled engine to verify that everything is leak free, on a bike you just bought and you need to check crank seals condition etc.
Place the tool in the carb manifold, seal the cylinder head with a normal spark plug and seal the exhaust flange with the included CNC exhaust blank plug. Pump the engine up to 5PSI and wait for 5 minutes. If there is no pressure drop at all or if it's less than 0.5psi, then the test is successful and the engine is assembled correct. If there is a pressure drop of more than 0.5psi, then fill the spray bottle with soapy water to find the leak and correct the issue. 

For twin cylinder models, an extra carb & exhaust plugs are included, as to check for any issues with the crankshaft center main bearing seal.

NSR250 Specific Notes : 
You will have to use the CNC exhaust blank plug along with the OEM exhaust copper gasket. 

Price is at 85 Euro (worldwide posting costs included). 


  1. Hi Nick, are you still sellng this kit? I am interested in purchasing the kit from you.

  2. Hi Mark.
    My lathe is dismantled at the moment. I think I have your mail so I'll contact you as soon as I'm ready to make more kits. Thank you.


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