Two Stroke Racelab

A recent modification on a '98-'99 Cr125 bike that alters the exhaust valve timing. A simple spacer made on the metal lathe that adds some preload on the governor spring hence retarding the engagement with the exhaust valve linkage. This mod can help for enduro use or with bigger carbs. I mostly followed the instructions from the below link though I made the spacer slightly thinner at 2mm thick. Link at : Honda 125 - HPP setup TIPS & TRICKS & TUNING @ thumpertalk.com

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...

Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists and anyone interested in creating interactive objects or environments.  It actually is a single-board microcontroller designed around an Atmega328 with an USB interface, 6 analog inputs, as well as 14 digital I/O pins which allow to attach various extension boards or applications. The integrated development environment (IDE) is open source and allows to write programs for Arduino using Processing language. Of course, right from the first experiments, blending Arduino with two stroke motorcycles was inevitable. Lots of people have constructed a lot of useful staff, from shift lights and data loggers up to complete CDI units...!

Pickit is a family of programers for PIC microcontrollers, made by Microchip Technology. The latest version called PICkit3 features a 16-bit PIC24F processor and offers a useful & convenient way for either programming or debugging PIC and dsPIC microcontrollers. Accompanying the pickit3 and available for free download is a powerful graphical user interface called MPLAB Integrated Development Enviroment (IDE).  For the connection to the PC you only need a free USB port and the pickit can be connected to the target via a header and instantly used as an in circuit serial programming (ICSP) device.  Making a simple Google search for motorcycle projects using PIC microcontrollers, you will find lots of stuff like CDI units, Quick Shifters, Shift Lights etc. and sometimes these projects include the HEX files so you're ready to program and experiment with some PICs with the help of Pickit3. 

Big thanks to Mario(ZA) for the VHM cylinder head. Check out his site at  nsr250spares.com

Some random pics of a ramair box installation that I did on my Nsr250 MC28 in the past. Safety pins for easy fuel tank removal. Closed cell neopren foam strips for good sealing.  Detail of the air scoop. Aluminum heat shield tape where the top cylinder is located.

...expansion chambers. It will be a difficult week.

Welding new mountings on a ΤΖΜ80 frame as to fit a later YZ85 engine.

Here is another bizarre Pgm unit. It is a factory kit PGM3 unit of Leon Haslam's Nsr500 V2 2001 bike.  It features a 7-pin socket on the top side of the unit for ignition advance reprogramming.  Still missing the rest of the parts to complete the Nsr500 bike though... LOL A piece of HRC history nonetheless!  Leon Haslam’s Shell Advance Honda NSR500V, 2001 FIM 500cc World Championship

Even when I try to organize the lab, the worktable would still be, so to speak, a mess!