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 

When time permits, I make some progress on my '91 NF4. This time I ended up refurbishing the dash. New panel from high density foam sheet. After dismantling the tacho, I used some emery cloth on the plastic panel. And then some polishing compound on a dremel tool with a polishing wheel. The end result looks nice and clocks are already installed on the bike.

And here is the final part on using a wet clutch basket for a FCC dry clutch conversion. I installed the clutch basket on the lathe and just did a simple "boring" operation. The FCC basket had a clearance of about 0.5mm with the backplate, so this was not really a critical job and it was easy to aim for a tighter clearance as well.  And here is the result after the boring job... The backplate is now a nice and tight fit and everything looks good. I've also used the cushions from the WET clutch basket as they fit perfectly. I don't see why Honda may have used separate rubber cushions for a dry clutch. One thing to note though is that due to exposure to high heat and no lubrication, they become very stiff and fragile while the wet clutch cushions have normally a more prolonged life. I didn't bother with making or buying new rivets as well. I just used a tap to thread the existing holes. Just out of memory, I believe it was a M5 tap that I us...

The HRC piston bearings for the 14mm piston pins are long gone. There are a couple alternatives in the bearing market but they are very unreliable so you will have to reuse the ones you have or search for a NOS part.  There is one very good alternative though. It's the below Yamaha little end bearing that is originally oriented for smaller capacity two stroke bikes. I've used these bearings myself with no ill effects and I found them to be very reliable and can withstand high revs without problems at all. The part number is 93310-21403.  Cheers.

Here are some photos while dismantling the wet clutch basket. The rivets were drilled as to remove the retainer plate. The rubber cushions seem to be in very good condition, they will become handy later... Here is the wet clutch basket after removing the cushions and the primary gear. Now back to the dry clutch basket. The retainer plate was removed and a real mess was revealed. The cushions were highly damaged and this must have helped for causing the cracks on the basket. Here you can better see one of the cranks on the basket. It goes deep and very close to the mounting points for the rubber cushions and the rivets. The two clutch baskets, side by side. The modification looks pretty straightforward and to use the wet basket on a dry clutch, only a simple lathe boring operation is needed. To be continued...

One of the issues I had with the FCC dry clutch conversion for my Honda Rs125 bike, was the clutch basket that had several cranks on the perimeter. While still having some wet clutch parts for my NF4 bike, I started thinking on the possibility of using the wet clutch basket instead of the dry one. Front side of both baskets...  Back side. To evaluate the possibility of using the wet basket on the FCC conversion, I had to strip them down completely and take more measurements and plan the lathe and/ or milling operations needed. Let's start with the wet basket by removing the inner collar. To be continued...

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. 

Handmade exhausts for Honda RS125 NF4 (1990 - 1994) models, are now available via my  online store. This pipe will fit 1987 - 1989 models ONLY if a 1990-1994 cylinder is used as the exhaust flange is different on earlier models.  Later 1995-1997 cylinders can be used as well and will work great with this pipe.  The package includes :  an expansion chamber a suitable exhaust flange 2 X exhaust springs (same dimensions as OEM) An end can is not included but the stock one can be used or even better a later NX4 type as the rear mounting point for the end can is not used.  For more pictures of the expansion chamber, check out the below link.  Handmade Exhausts Price is 220 Euro (worldwide posting costs included).  Prior buying the pipe, please contact  for estimated delivery time. 

Many thanks to Trev(OZ) for sharing a couple pics from one of his latest 125 rebuilds. It's always very encouraging & flattering seeing some of my work been used on an actual bike. Thank you all for your support, it's a great push to keep me trying to get better.

Many thanks to Mikkel(DNK) for sharing a photo of his lovely NF4 bike. I hope it will be ready soon and the new pipe will deliver the goods.

Leak Down tester kits for the Honda Rs125 bikes can now be purchased via my online store. You can find the link to the store, at the right hand side of this page. Leak Down Testers for other motorcycle models will be added in the near future or upon request. Price is at 65 Euro (WW posting costs included).

Walter (AUT) at Classic-Bike race in Schwanenstadt, Austria on September 6th/7th.  Freddie Spencer attended this race. So, here are some bonus pics on a VFR750R.

Many thanks to Walter(AUT) for the pics of his NF4 bike. I hope the new pipe will deliver the goods.

Suzuki Rm125 connecting rods will straight fit the Honda Rs125 NF4 & RS250 NF5 bikes. It is +6mm longer than stock though, so be prepared for some more mods prior installation to the engine. The 110mm Suzuki connecting rods are from Rm125 2004-2008 models.

Working slowly on the Rs125 Nf4 and as a side project. It will start taking shape soon I reckon.  It features lots of special and tricky parts like WP front and rear suspension, Marchessini wheels, FCC dry clutch, Brembo front brake caliper, Pax carburetor etc.