Two Stroke Racelab

There is an issue with the stock Nsr250 carburetor needles, the clip position is fixed and cannot be altered. This is fine for dead stock engines but may cause some troubles if any modifications have been done to the engine, e.g exhausts, derestriction of the PGM unit, opened air filters etc.  Of course, it's still far away from owning the complete HRC jet kit but a good option for people with mild tuned bikes. Anyway, let's make some chips...  The fixed clip removed... The fixed clip was positioned at 1.8mm from top of the needle and Keihin needles have clip positions about 0.8mm apart. So, I made three groves in total. That is, one groove for a leaner position, stock position and one richer position. For the grooves I used an HSS lathe tool grind to the correct dimensions for stock Keihin clips.   And here is the end result... As the fixed clip was thicker, a washer should be welded or pressed to the needle holder to accommodate for the thin...

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.

Το περιοδικό Motosport επανακυκλοφόρησε ύστερα από 11 χρόνια απουσίας. Μπορείτε να το βρείτε στα κεντρικά περίπτερα της Αθήνας και Πειραιά καθώς και στην υπόλοιπη Ελλάδα προς τα μέσα με τέλη Αυγούστου το αργότερο. Όπως και σε κάθε περιοδικό μοτοσυκλέτας που σέβεται τον εαυτό του, έτσι και εδώ δεν θα λείπουν οι αναφορές στο δίχρονο κινητήρα. Η θεματολογία του πλούσια και με ευρύ περιεχόμενο, τυπωμένο σε χαρτί υψηλής ποιότητας και όλα προϊδεάζουν για μια ενδιαφέρουσα και ποιοτική συνέχεια.  Το επίσημο site του περιοδικού, βρίσκεται στο παρακάτω σύνδεσμο.  motosport.com.gr

This post is about the one and only Hellenic Motorcycle Museum that is based in Athens, Greece.  It features a big collection of vintage and rare motorcycles as well as many barnfinds. Panagiotis Mariolopoulos(GR) has gathered a quite broad collection of motorcycles with something for everyone, ranging from 1919 up to present though with an emphasis tilted mostly toward European models. The collection is constantly changing and expanding in a three-storey building, that each one features it's own theme. At the museum, you will find names from Ariel up to Zündapp and most of the manufacturers starting within the Latin alphabet in between. For more info and pics, check the official site at  motorcyclerepublik.org

A short list of two stroke related books. A lot of them are now discontinued and the list is certainly not complete but I beleive I have included all the major and well known books. 1) Design and Simulation of Two-Stroke Engines, Gordon P. Blair 2) Basic Design of Two Stroke Engines, Gordon P. Blair 3) Two-Stroke Performance Tuning, Graham Bell 4) Motorcycle Tuning: Two-Stroke, John Robinson 5) The High-Performance Two-Stroke Engine, John C. Dixon 6) Villiers Singles Improvements Handbook, Rob Carrick & John Wood 7) Mini-motocross & Pitbike Performance handbook, Eric Gorr 8) Motocross & Off-road Performance handbook, Eric Gorr 9) Two-Stroke Tuner's Handbook, Gordon Jennings 10) The Two-stroke Cycle Engine, Heywood 11) Internal Combustion Engine Fundamentals, Heywood 12) Two Stroke high Performance Engine Design and Tuning, Bossaglia 13) Two Stroke Power Units, Irving 14) Tuning for Speed, Irving 15) The High Speed Internal Combustion Engine, Ricardo 16...

I'm in the middle of fabricating an expansion chamber for my Vespa smallframe. It's a demanding job with lots of challenges but I hope that eventually everything will go well. It seems like I will have to spend a lot of working hours along with my tig welding machine.

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.

Μια ακόμη δίχρονη βόλτα πραγματοποιήθηκε εχτές Κυριακή, 22 Ιουνίου.  Ευχαριστώ όλους τους φίλους που παρευρέθηκαν και έκαναν πράξη ενα γεγονός που τα προηγούμενα χρόνια φαινόταν ακατόρθωτο. Περάσαμε όλοι πολύ καλά και ανυπομονούμε για την επόμενη βόλτα. Για περισσότερες λεπτομέρειες, φωτογραφίες κλπ ακολουθείστε το παρακάτω σύνδεσμο στο  2stroke.gr Παλαιότερες βόλτες...  2strokes, going for a walk... Vol.I 2strokes, going for a walk... Vol.II 2strokes, going for a walk... Vol.III 2strokes, going for a walk... Vol.IV