Two Stroke Racelab

Leak Down tester kits for the Yamaha TZR250 1KT - 2MA & TDR250 bikes, can now be purchased via my  online store. 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 en...

A few months back I made a custom leak down tester for Jason(UK) and here are some photos that I received and wanted to share. Jason owns a Banshee motor with Athena 421cc cylinders and used to have constant seizures on LH cylinder and needed to verify that there is no air leakage on crankcases, oil seals etc. Hi Nick, You did me a special leak down tester for my 421cc Athena Banshee last October. Your kit fitted perfectly and I had zero leakage - actually gaining a bit of pressure after 7 minutes due to a little air bleeding back from the second cylinder through the labyrinth seal after I had taken the pressure a little over 5psi and then used the needle valve to set it to 5psi exactly. Thanks again - I am delighted. Jason      And here is Jason's bike. 

I've just completed working on a custom made leak down tester to suit Nsr250 Mc16 Keihin 28mm carbs, for Karl(UK). I love working on a metal lathe.

Handmade main jet wrenches can now be purchased via my online store.   This tool can be used with all Keihin carburetors for Honda Rs125 - Rs250 bikes and Mikuni carburetors for Yamaha Tz125 - Tz250 bikes.  It will also fit almost all Keihin - Mikuni carbs with 6mm hex main jets. Main body of the tool is made of aluminum, it's longer than common jet wrenches as to better clear the carb bowl and features a knurled grip.