mopeds


Throwback

I’ve been missing for a bit, but am still around. The frevolution has been kicking it, and I finally pulled the custom built pipe from my derbi race bike off so it doesn’t get destroyed by the streets (and fog) of SF. I got one of those fasmem pipes from treats and had to add a little bracket and trim my transmission cover a tad to get the fit. I had a little electrical issue (read: custom construction = melted headlight) and got a replacement that was creating some gremlins. Some crafty work and now all systems are a go. It doesn’t run nearly as well as it did with the simoni pipe, but a little tuning ought to help out. It does fit on nicely though.

Next up might be a throwback: decking out my clean newport with a gila/phbg ripper setup and mobbing that around town. The details are unclear, but I have a few kits sitting and I want something a little different for the city. I love the start 3 derbi motor but I don’t want to go all crazy with it and unfortunately am limited on gearing by preserving the puch swingarm/wheels. So I’m thinking simple e50 build on a nice base. Should be simple and fun to ride around. With some luck I’ll have a post or two about it.

Oh yeah, got another toy, but it still needs a little work. More on that later.

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derbi dreams
February 6, 2012, 12:59 pm
Filed under: Projects | Tags:

I know this is a recurring title, but this time its for real. The pinnacle of Derbi.

Packing some HEAT



A Frevolution is Coming
August 15, 2011, 8:02 pm
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A work in progress. Plans are for a 50cc ripper. All brackets built, pedals will be functional, ripping pipe clears all, together maybe the best moped ever Next up is some cosmetics, welding and assembly. If the 50 doesn’t deliver, maybe a 20+ hp scooter cylinder. Coming soon to a rally near you.



dellorto SHA, dumb; running derbi, awesome

Just before the reno rally I spent a few days trying to get my thrown together derbi variant running. That should have been a relatively simple process figuring that the motor was running fine about a year ago in stock form. This clearly wasn’t the case. I did change a few things, primarily the top end, to a stock jug bored (long ago) to 60cc. I threw on the stock intake and carb and it ran rather well with decent pep and seemingly unlimited top speed. I went to ride it home (as I built it at Matt’s house way back in January) and it made it 1 float bowl in the stupid sha. I pedaled the rest of the way home.

So I tried cleaning the first carb, taking compressed air and carb cleaner to it twice. Same result, it died. So I tried a second 14.12 body with the same result. I asked Tom to borrow one, and this was even worse. It would kinda idle, but when reved it sounded like it was burping like there was a huge leak, but the seals were fine. So I tried cleaning that SHA again today to no avail (and why should anything change, the derbi has a spotless plastic tank).

Pissed off I finally decided to throw on Tom’s custom intake, his first from 3 or 4 years ago, 19mm funneled down to 14mm. My least favorite task on mopeds is running throttle cables, so I just pulled the throttle off ferbi which conveniently was already hooked to my dellorto phbg cap. I didn’t feel like routing the cable through the frame just yet, but I got it all bolted on and of course it fires right up and rides like a dream. It also fits in there super easy! Lesson learned: never use a SHA.

While working I also fixed the wiring which I kludged together back when I built the bike. Everything is much cleaner, the kill switch works as do the lights. So now the bike is almost done. It still needs fine tuning because all my dellorto jets are missing and my randomly picked phbg (84 main, 48 idle, needle ?) only works so well. The variator also needs some fine tuning to fully variate and reach higher RPMs. Despite it all, I think its a pretty cool bike that is fun to ride. With an air box it will keep the neighbors happy as well.


I’ve seen some stuff asking about switching derbi mags between bikes, and because all derbis have very subtle differences, the solution you come up with may be unique. This bike is older (PP) and had spoke wheels. Late bikes, or at least the Variant Sports, have brake hub tabs that are longer (they go lower towards the axle). I switched to a set of lowers from the variant sport so that the tab better held the revo hub, but the wheel couldn’t be properly centered. We then ground the hub down a bit so it all fit together. Fortunately rear wheels are easier as it seems just about all (but of course there are exceptions) have the same size tab for the hub regardless of the swingarm configuration. The biggest issue going to the revo mags is the cables as the ends on the newest variants are different. This is nothing some strong knarps cannot fix.

Finally a note if you are doing this: buy the fork lowers for whatever set of wheels you are switching to. All Derbi variants have the same fork uppers which allow all lowers to be 100% interchangeable. Tom had a spare set of revo mags and conviently forks, so he just swapped the lowers over and avoided ugly half-assed attempts at removing forks and grinding hubs.



derbi disappointment
January 26, 2011, 8:31 pm
Filed under: Uncategorized | Tags:

the other day I went to get the derbi from matt’s house cause his garage is packed and I was pumped to ride it, but then it let me down. I made it maybe a half mile, then nothing. So I had the pedal the rest of the way home, thankfully mostly a slight downgrade. Sucked though, my legs were beat. I dunno what is wrong yet, probably a fouled plug or my sketch wiring fell apart. So that was a bummer, and now my shed is as packed as can be.

Still no snow in the forecast, bummer town.

I went hiking today in my waterproof shoes but I got a blister. Pretty sweet scenery, some big birds and a nice view. I made a big panorama from the top of the hill. Please note that its not nearly perfect. My image hosting site is sucking right now, so its on flickr, but they suck too, not letting me upload the full 12 thousand pixel image. So here’s the mini-version. Oh hey, can’t make anything out! Go interwebz! Oh yea, I know my camera’s sensor is filthy, working on it.



Derbi SL build pt2
January 9, 2011, 12:35 pm
Filed under: Projects | Tags: , , , , , , ,

Got the beast running today. We had some little troubles with a bad head gasket then the wrong base spacing, but we got it all dialed in and it fired right up. Runs like a beast! Pretty quick, especially for a 12.12 sha. I can’t wait to get something bigger on there. We have some minor things to do still, but basically its all there. Score!

Sean got his new build fired up and its looking good. Obviously need some more little things, but hey, almost there and it sounds great.



g3 customz

So I need to get my g3 all spruced up because I never have and it was having some issues, so now is the time. I began going over everything and started to figure out what needs what. Clearly it needs a good cleaning, re-sealing of all the gaskets, new fluids, a new brake cable, the decomp sealed and some other misc stuff to make it all pretty and awesome.

While messing with some electrical stuff I realized how stupid the lower side covers are because there is a 4 inch gap between each some the top of the motor, the lower frame rails and wiring are all exposed. No good. So with Matt over I had to devise a quick plan to fix it. I found a black tray and measured it all out but I didn’t have any way to cut it out. Matt has a band saw but I knew I wouldn’t get it right the first try, so I devised a ghetto-fabulous rig of a hand operated scroll saw upside down in my vice. Super sketch but it worked.

I cut it all out with Matt laughing, did some fine tuning and this is what I got. Everything fits nice and snug and it sure looks better. I should take a picture of the before. Super custom! I was thinking maybe I should get the other upper cover (I only have 1 side), but I put that one on and found the fit was terrible. There is a huge gap between the seat and the cover and it look like poo. So no upper covers.


Oh yea, here is my new derbi thing. Maybe I’ll try and make a post explaining it all but its still all a mystery to me. Maybe try and guess everything on it, its a nutty machine. And of course Matt forgot the jet I needed so its not running right yet. Lame.