derbi, attempt 4
August 20, 2009, 2:56 am
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racer renditions:
1-gila, 24 oko, metra bendy pipe. Seized in the canyon in LA, got it running, matt raced it, seized it again.
2-gila, 24 mikuni, metra bendy. seized by matt again.
3-gila, 24 oko, puch cdi, zen. seized racing
4-current build.

so the previous builds all had their own issues. I thought number three was solid, and it ran well, but super noob jetting made me seize it. So yea, now its being done better, maybe not perfect, but better no less.

I wanted to run a metra 80, but those pistons are not available, so I’m going to run my polini instead. New intake, ported the exhaust and transfers a bit more, cleaned up the case matching, milled stock head ghetto polished, and its going to run a 24 mikuni. I got the selettra cdi just cause, so we’ll see what that does. The zen has been re-angled too many times, and it needs to be done once more. Hopefully everything together will equal a sweet blaster. I need to get a piston tomorrow, fix the pipe, and it should basically be good to go after double checking the timing. I don’t know if it will be crazy fast, I doubt it, but it should run well. I just want a shit ton of midrange like tom’s bike so its quick through the turns. I’d like to change clutch springs too, but we’ll see about that later. Paired with amazing brakes, I should be able to get some decent lap times.

check out these sweet bikes:


good and bad
May 30, 2009, 5:53 pm
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derbi was running well, then I decided I wanted it to be better. This didn’t work as well as I imagined. It’ll be fine tomorrow, but its annoying today. Some sweet upgrades over racer version one.

this is the rest of the current running fleet. 2 will be gone soonish.

coolest moped ever?
May 12, 2009, 4:55 am
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so my buddy matt (who rode my dying derbi at the 1st polini cup) has just about finished his amazing new derbi/garelli sslx combo. The bike is amazing, with a flat reed motor, 70cc metrakit, lomat 4 petal, 24 mikuni and a big zen pipe. He’s got nice EBRs and its fitted with derbi spokes. Regardless of all that maybe cool stuff, its an awesomely fabricated and proportioned bike. Its super low and very solid. The front mount is all fabbed up and nicely welded by one of our race car building friends. I dunno, I guess you’ll just have to see it at the polini cup to appreciate it. He says he’s got an amazing seat coming for it, but I dunno, I feel like that will make or break the bike. Heres a photo in its mock-up state, I’ll give more when his seat arrives.

cuperteens race team that stinks at racing because we are newb tuners and kinda crummy riders
May 5, 2009, 1:48 am
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Ok, so polini cup #2 is over, and I’m here to report on the cuperteens.

So yet again, we suck. Matt got his derbi up and running well during the week all to be destroyed 1st practice on saturday. He was going fast, jetting looked good, but upon really opening it up on the front straight, it super seized. It was a 4 corner seize flaking the nikisil on all 4 points. Cylinder death. On sunday he saw that his fuel line was kinked, meaning the float bowl didn’t fill fast enough, so when that mikuni was dumping fuel on the straight, it ran out, leaned out and broke. That was dumb, but won’t happen again, at least that way.

Tom was back out there on his gilarderbi. Round one was tough with a nasty soft seize followed by a crank big end bearing seizure. With a new crank in, his bike was actually quite reliable, but it was slow. The weather was weird this weekend with high humidity and higher temps than we saw last week. Needless to say, he wasn’t jetted correctly, and wasn’t making enough power to fully variate despite changing the weights a few times. I think he finished 19th the 1st race (he fell) and did better the 2nd, but not top 10. So even though it wasn’t awesome, his bike survived some abuse, evoking more confidence in the setup.

We had an extra derbi flatreed variant that sean ended up riding in Matt’s place. It only did 35-maybe 40, but he actually held up well before everyone dusted him on the straight. He didn’t block anyone too bad, so that was good. He had a lot of fun on the track despite being the slowest. Crashes and others not starting meant he wasn’t last place. I don’t know if thats good or not.

Lets pretend tom held onto this one.

justin blasted everyone on magnumx

So it was a fun weekend again, but tons of mopeds. It looked like a rally pack on the track, and seemed unsafe. The fastest 6 or so lapped just about everyone else, so I think we need to lobby polini to split the heats up next time as there will likely be even more bikes. Sure its fun racing with a bunch of people, but I’d hate to see anyone hurt.

I might (hopefulllly!) be out there next month. My derbi is almost back alive. Its had some upgrades, so it should be quite competitive if I can get out there. Look for those updates soonish after a few stupid midterms.

PS, I should add that I do not represent the riding styles or mistakes my friends made on the track. That said, watch out for them, they all went down, and they all get in the way. We should be the “cuperteens race team that stinks at racing because we are newb tuners and kinda crummy riders”.

May Polini Cup
May 2, 2009, 1:49 am
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Its currently friday evening and raining here in Cuperteens Derbiland. Our scouts, Justin and Calvin are currently hanging out in Atwater and are reporting rain rain rain. I guess its supposed to rain tonight, and let off a bit tomorrow and sunday. Nick, sean and I leave tomorrow morning for super hang out session. I’m bringing Magnum X to cruise the pits.

The race team is again just Matt and Tom. Both have derbis, 2 or 3 total, I never really know. Last minute tuning/repairs happens tonight then the love-birds go on the road tomorrow. Hopefully bikes will survive better this time around, I think they will.

Thats all, no real updates, I’m just excited for tomorrow and sunday. We are going to bring our wiffle ball gear, so look forward to playing tomorrow evening.

Almost done!
February 23, 2009, 2:58 am
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So today was a fun-filled reassembly day. I’m almost done. Now that its almost done, I’m glad I didn’t paint/powdercoat it. It would be too nice if I did and I like the red/gold.

I found the intake. The carb is at an angle, but it’ll be fine to run.

I thought I lost some stuff but I eventually found everything. All I need to do now is pick a pipe (I’m leaning metra cause the zen is super top end. Also its going to be easier to get pedal clearance.) and finish the ignition and timing. I should probably get a tail light too.

Derbi-Herbi Updates
February 22, 2009, 5:18 am
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Update day.

So the black magnum has been sold and was delivered yesterday. I also dropped off my tank and fork ears for my next magnum up at Motomatic in sacramento. I’m getting them done in white, the frame is already a brownish gray, and the wheels are going to be black. I’m then going to do some orange stripes on the mags and get some black and orange decals to pull it all together. The airsal and other goodies seen below on the brown magnum will be on it.

I worked all day on derbi today. I had to pull the cases apart to grind away some nubs that the piston was hitting at the bottom of the crank’s rotation. So yea, I got to see all the inards, and its really pretty simple. There are a few gears and a chain, but nothing really exciting. I got the cases back together and the gilardoni bolted up with the metra decomp-head. I got a stock gila intake yesterday (thanks rafter and nate), but I lost it somewhere in my car or something. If I can’t find it I’ll weld something up.

I also bolted on the tjt I got from benji yesterday. Tom was telling me he had all sorts of problems but mine slipped right on and it seems fine. I greased up the rollers as well. I got the TJT pulley spring on, and after hearing a lot about issues with the hobbit version, the tjt is clearly stronger than stock, but not by a whole lot. It should work fine.

Tomorrow I’m going to finish up the motor (electronics which are a disaster) and switch my m29s over to the derbi mags and hopefully get the rest of the bike together and ready to run. I also need to cut and reweld my zen pipe, but that should be pretty easy. This bad boy should be running by next weekend if all goes to plan.

I also got some grande forks (thanks ZachLee!) and they fit perfectly on the hobbit. I also got a rear hub for my 16″ puch five star so thats going to be on the back. I’m going to have to weld up a tab for the break plate and hopefully the gearing will work out alright. I feel like its going to be a bit short, but we’ll see eventually. I need some tires but I’m not sure yet. This bike is going to be butt-ugly with all the different parts to it, but it should be decently fast and hopefully nimble. I was originally worried that the wheelbase was going to be too stretched for the frame, but now I’m worried its going to be short. Herbi is going to be on the back burner while the gilarderbi gets going and tuned, but I’ll be getting everything on herbi ready as I go along.