Two Stroke Racelab

James(UK) asked for a Battery Eliminator for his Crm250 bike and even though I've stopped making them a couple years back, I thought of making another bunch.  If you need one please message me for orders.  P.S The BEs will come with ring terminals for M6 screws. If you need another type of connectors please send me details and I'll do it for you. Thanks. Nick 

Leak Down tester kits for the Suzuki Rgv250 and Aprilia Rs250 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 engin...

Some pics on how to setup the exhaust valves of your vj22 engine. 1) Turn the ignition "on". 2) Turn the kill switch to "on". 3) Find the "grey" wire that is located near the battery and most probably it's under the fuse box. Uncover the brass fitment and touch it to the ground terminal (-) of the battery. You should immediately hear the servo mechanism moving. While you are still keeping the grey wire on the earth terminal... 4) Turn the kill switch to "OFF". 5) Now, it's time to setup the powervalves. You should align the mark on the servo pulley to the second mark (there are three marks in total) on the cylinder. Keep enough slack on both servo cables (about 2-3mm) and you're done! Cheers!

I've been working on a friends bike for the last couple days. Lovely bikes...

I reconditioned an Aprilia Rs250 engine for a friend so took some pics in the process. Lovely engines, some small issues on cylinder castings, the LH reed valve blocks the rear intake port, RH crank case needs some remachining blah blah blah and the usual stuff. Port heights and blowdown time are on steroids! Very nice intake and everything coupled with a good pair of adequate reed valves but I don't like the carbs though. Allen bolts in the crankcase area, very common practice on Suzuki engines. LH and central crankshaft bearings are 83464A-9TC3 (with dowel pin) and RH bearing is 83580-9C3 (dowel pin & groove). Some oil keeps the washers in place and ease piston installation. I didn't used the expanders below the lower piston rings. Duh... trying to find a second good pair of exhaust valves. I wouldn't describe the person that designed this exhaust valve as a minimalist. LOL Almost done.

Not the kind of posts that I do but the good company deserves it... More beers for Nick, Thanos, Harry and myself at RoadHouse Rock Bar. More food as well. ...and Harrys keep ruining my photos and keep calling me a moaner. LOL Cheers for the NSRs... ok and for the Aprilia Rs250 as well. 

Spent a day on servicing an Aprilia Rs250 for Hari(GR). Quite a nice bike and very well designed.  I really like the bigger workspace in the engine over a Suzuki Rgv250. Handling is very promising for a dead stock bike though power delivery is quite linear for my taste.  Carbs are way rich for stock bikes at 270 (powerjet +55) for LH cylinder & 280 (powerjet +35) for RH cylinder. Ignition curve is a little bit retarded as well, it seems like even stock bikes would benefit from a couple degrees ignition advance. The expansion chamber dimensions would be fine with a few modifications & smaller lengths here and there plus lighter end cans. Speaking of weight, I also don't like the steel subframe on first models but I believe this can be changed easily. Overall, it still is one of the best 250cc street bikes out there. I think I must put it in my wishlist of 2stroke project bikes...