RSGP125 BUILD3
May 19, 2013
Suzuki GP125 engine strip down
Here are some more internal photos of the GP engine as I pull it down. I ended up drilling most of the phillips head bolts which hold the casings together as they were corroded down the thread. What a stupid idea it is to use a phillips head, honestly.
This last photo is of the tiny GP gearbox assembly. I wanted to show it to give you an idea on how a motorcycle gearbox works (although similar to a car) in translating the up and down movement of the gear changer to a change in gear. When you push up or down on the changer, a mechanism spins the grooved barrel in the top of the photos. In those grooves are the gear selectors which move left and right depending on the groove. The selectors move the gears on the input and output shafts which engage with each other to drive different combinations of gears and therefore ratios.
STREET PARADISE
May 11, 2013
ZARCO DERBI 125
May 7, 2013
A thing of true beauty
RSGP125 BUILD2
May 6, 2013
I swapped the Honda NX4 RS125 tailpiece from my 4 stroke onto its rightful home on the RS125 chassis.
A few NX4 RS125 expansion chambers also turned up on my door this morning, thanks Jesse! I know they’re not matched perfectly to what I will be doing to the GP engine but Rob has shown that they work well enough to get some great power figures from them. It’s also easier to use an RS one to get it going and rideable instead of stuffing around building one that is likely to be crap. I do plan to build a few in the future though…
RSGP125 BUILD1
May 6, 2013
I spent some time at Tim’s (a fellow F4 racer) place on Anzac day talking crap about bikes and figuring out how we can get some economies of scale going on with our GP125 builds. Being the good bastard he is, he gave me some… ummmm… used GP125 cases and a test bed GP100 cylinder for some time on the grinder before jumping into mine. THANKS TIM!
I started undressing her the other night and took some photos along the way:
Factory Suzuki GP125 crank case as provided by Tim
Tim’s degree wheel for port timing
Port side
Factory timing marks
Starboard side
Tokoroa GP 2013 Photos
April 28, 2013
Here are some more photos from the Tokoroa GP 2013. I cannot emphasis how awesome this event was, such great competition!
^Nathaniel Diprose took it out on his Honda NF4 RS125 powered by a 80cc watercooled Derbi engine putting out 21hp
Tokoroa GP 2013
April 27, 2013
Wow, what an awesome weekend that was! That was my first time visiting Tokoroa and it’s such a fun circuit, although hard on the body into those down hill sections. Huge thanks to the organisers, time keepers, flaggies, and everyone who drank beers with us on Saturday night. Congrats to everyone who raced and those who triumphed. The GP looked fierce, I was nervous before qualifying and I wasn’t even in the race!
I just wanted to point out that there were TEN, yes TEN Honda RS chassis’ at the GP (including a RS250) and not including the GPR diesel which is pretty much a RS. That’s more than a nationals round I believe…
Cheers to Glen for showing me a few improving lines during the track walk and to Cully for letting me pervertedly handle his RSGP125. On that note:
TOKORA GP 2013 – Sunday race video
April 23, 2013
Here’s some footage from the GP race on the Sunday of the race meeting. I ran out of card space about 3/4 through and I was shooting photographs at the same time so enjoy the glimpses! Man that was an awesome race to watch
UPPING THE GAME – ENTER RS125
April 21, 2013
This happened about two weeks ago and I can’t get it off my mind. I dream of building and racing motorcycles (hopefully for a living one day) and this is just the first step forward in many that are required. It is partly why I’m selling of my Datsun gear. This is a NF4 Honda RS125, a GP bike of the days when 2 stroke 125cc bikes were raced on the world stage. I’m unsure about the exact year of this bike but it’ll be approx the mid 1990′s.
The Honda RS125 was a bike that could be purchased directly from Honda by any club racer or enthusiast, they’re the peoples racer of sorts. The later model variants have a revised rear suspension system and a thicker main frame (basically overall better), but that does not detract from how awesome these little bikes are.
The plan: take the engine from my Suzuki GP125 and with some guidance from Team ESE and Tim modify/tune it to produce a chubby power curve (approx 20hp would be fine) to tackle the F4 kart tracks. Then I will squeeze it into the tiny frame and learn to ride a real race bike. I am not planning to sell my Suzuki FXR150, rather build a new exhaust and keep it serviced as a backup if the unthinkable should happen and the ‘stink wheel’ (as they call them) fails. Last week I bought all new fasteners for the frame as the original ones were looking pretty shot. I also woke up to a fairly new set of Dunlop slicks at my door. There are many things I still need to get for this bike but I’m working through them all slowly. Here’s to the beginning of a life of 2 strokes!
TOKORA GP 2013 – PITLANE & PRACTICE
April 18, 2013
On the weekend the 2013 F4 GP was held at Tokoroa Kart track. This is a simple walk through the camp ground/pit-lane on Saturday followed by some practice laps by the F4 GP class. There will be some more video of the fierce race to come. There were TEN, yes, 10 Honda RS chassis’ at the GP this year. This included one RS250 and one NX4. That is more RS’ than the National 125 rounds!
