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Red Rocket: She runs, but...
Posted: Sun Apr 29, 2018 10:49 pm
by toratora
Got the bike running. Made it through all of the heat cycles perfectly. Even did a little bit of test riding, and it was great. Put my leathers on and went for a real test ride. I'm running 16-53 gearing. One tooth larger on the front than I run with my other hopped up bikes. The bike easily pulls it. There's always some power, but around 9k it hits the pipe and wow does it wake up. The feeling of power is like the Mito, but since the bike is much lighter it's really heady.
I realized I needed to get some gas so I turned around to find a station. Slowing down for a left hand turn (much like our right hand turns) the rear end locked up, and stalled the bike. I was lucky not to crash. Something in the gear box caused it to lock up. I was able to get the bike into 1st gear and start it up again. It runs just fine, but the gear box will only shift through 1st to 3rd. It wont go into 4th. I've looked over the docs, and I can't see where I have missed anything. If something broke than that's it. No way to get parts here in any reasonable amount of time. They don't seem to stock parts anywhere. It's all order on a issue by issue basis.
Not really sure what to do at the moment. Time for some research action.
Red Rocket: Transition
Posted: Sun Apr 29, 2018 11:21 pm
by toratora
Here's the photos of the Derbi gear box from the Euro2 manual. The gear box is identical on the Euro3 with one exception. There's a small protrusion on the shifter barrel for the neutral sensor—it's too bad that they didn't fix seven different levels to have a full indicator set of the gear box.
From these images we can see that 3 and 4 are right in the middle. The part of the gear box that I didn't take apart.
Red Rocket: Mini Post Mortem Part One
Posted: Thu May 10, 2018 9:39 am
by toratora
I have many photos to post, and will get to them eventually. But it seems people want to know what happened. I'm not really sure. I've had a hypothesis, or two, but from looking at the various photos I'm really not convinced either way.
The strongest hypothesis is that when I split the cases stress was created that caused a weakening of the cases on the clutch side secondary shaft bearing. The reason this is a strong one is that the cases were held together at the transmission because the secondary shaft couldn't come out of the bearing. It actually pulled the bearing out of the cases. This was caused by the extreme oxidation on the secondary shaft on the sprocket side. So even though I cleaned the shaft before splitting the cases, I was unable to get to the oxidation behind the seal. And this was enough to cause trouble.
Now I should have seen the disparity sooner, and not put so much stress on the cases when splitting them. But this was the very first time I had ever experienced something like this, and I missed it.
But the reason I have to doubt this hypothesis is that looking at the photos of the cases when I picked them up from Inoue Boring, even when I zoom way in, I seen no evidence of any issue on the cases. Not that this disproves the hypotheses, because maybe the damage isn't visible to the human eye. When I reassembled the engine the transmission spun smoothly, and shifted into, and out of all the gears.
Red Rocket: Inoue Boring
Posted: Thu May 10, 2018 11:39 am
by toratora
Once I had the engine open, and took a look at what was needed I had to find a company that could help me with enlarging both the crank case, and the cylinder fittings.
Chika from
Two Stroke Magazine introduced me to
Inoue Boring. These guys are totally worth checking out, and I will be writing about them at length is the
Tabi thread. Here are the cases as they were when I picked them up. They looked incredible.
Red Rocket: Finding a Match
Posted: Thu May 10, 2018 12:39 pm
by toratora
Red Rocket: Assemblage 23
Posted: Sat May 12, 2018 3:39 am
by toratora
Red Rocket: You Spin Me Right Round
Posted: Sat May 12, 2018 4:39 am
by toratora
Red Rocket: Clusters
Posted: Sat May 12, 2018 5:39 am
by toratora
Red Rocket: Studlandia
Posted: Sat May 12, 2018 8:39 am
by toratora
Red Rocket: Pistons and Reeds
Posted: Sun May 13, 2018 3:39 pm
by toratora