Two Stroke Racelab

Quick and dirty modification that allows the use of HRC cards on a stock MC28 wiring loom. Modification is easily reversible by removing the jumpers that were salvaged from a highly damaged Mc21 wiring loom.   For references I've used Matt Patterson's article :  MC28 NSR250 WIRE SPLICE   and also Eric Geitl's similar modification :  nsr-world.com - MC28 no cut wire splice Top jumper shorts Oil switch (Green/ Pink) to Ground. Bottom jumper shorts Side Stand switch (Green/ White) and also GPS - Neutral switch (Light Green/ Red) to Ground.  P.s According to my findings so far, not all three grounding points are needed though I don't have a HRC card to try at the moment and I just started researching PGMIV units so I might be wrong. Have fun. Nick  

It must be about 12 years since the last time that I worked on a PGM4 unit. Back then I repaired a few but I had my own Mc28 bike as to try them out. At some point I had to sell the bike and as demand for Pgm4 repairs was very little, I omitted to keep proper notes of my work and the bike.  Tom(UK) insisted that I should work on his damaged PGM4 unit and entrusted me with all the bits that I need as to do proper research on them, including a wiring loom, stock card, clocks etc.  To be honest, after so many years working on PGM units from Crm250 up to Nsr500 units, repairing the ignition issues on Tom’s unit seems much less daunting than I thought.  Hopefully, I will soon be able to repair PGM4 units as well. Stay tuned. Nick  P.S I would also like to say big thank you to my good friend @Thanassis Karabellas for his continuous support and for providing me with a couple more Mc28 parts that I need.    

 

Time flies while you ride a 2stroke and this blog is now 15 years old. Have fun and keep the two strokes alive! Nick

Two more RD500 bikes will once again ride smoothly soon. Many thanks to Jean(CA) for the photo. 

Rc Valve issues on AR PGM units are not easy to repair but not impossible. Two more units ready to get back to Karl(UK) and Sunny(MT). 

Many thanks to Steve(UK) for the photo.  RZ500 in the background... 

Happy New Year to all.  First post for 2025 with photos from Sam's(UK) Crm250.  

Click in the link to read full story :  iconicmotorbikeauctions.com/auction/1990-honda-nsr250-mc21-3/  

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