mopeds


polini cup round one

I’m home, tired and don’t want to study, so lets talk mopeds some more!

Me and some superteens went out to atwater for some good old fashioned fun, because what could be better than mopeds, racing, hanging out, and super target, all 2 hours away from anywhere you’d actually go if you were a sane being. Of course we got there late, and of course the mopeds were on the track at that percise moment, so I missed practice. I wrongfully assumed it was like last year with 4 practices, but nope, this year it was 3, so I was down to 2. I was a little skeptical of the magnum (derbi?) just because I knew I’d be abusing the za, so I “tuned” it up (set the timing and “jetted” it, meaning it was good to go!), then got out there. The n8p was pretty dismal with my gearing choice (18×36) in that it would downshift on the hairpin and maybe the big wrap-a-round left, but otherwise I’d be in 2nd with no power through the turns. Not good, but once it hit on the straight, it went pretty fast, seat of the pants maybe 60, but probably more like 55 or less cause I couldn’t top it.


Rafter was really cool and let me throw a spare destroyer on there for the next one, and boy, what a pipe! I’d always kind of just dismissed destroyer power as a fad (really I’m just too cheap to lay down the scrilla), but it holds its own. Similar in its hit to the circuit, but later, and if you tempt the za long enough, it’ll pull through the band and shift right back into it. Fun stuff!

As many are likely aware, there were some rad builds this winter (or last couple weeks), and all were quite impressive. Jimmy and Tony worked together to build a pair of identical awesome flat-reeders. Each is stroked out, ported all nutty like, tuned pretty well, lightened here, strengthened there, and a custom pipe finishes it all off. This things are next level, and both definately have the potential to deliver some quick laps.


Tommy built a vogue, but got the massive mikitech cases and clutch pulley, is running the derbi metra, a 28mm flatslide among other insanity. Its fast, and when its fully tuned and ready, it will be head to head, power wise, the full length of the track.

Dean built the VX4, the most unique moped ever. It has a pinto frame, hobbit cases, derbi cylinder, moby crank, moby er3, derbi rear pulley, hobbit front variator and clutch, hobbit rear pulley and wheel, HPI, hydro ebrs, custom subframe, in-frame gas tank, and probably many other things I forgot. Regardless, its got the potential to eat every moped. The 2 pulley sets variate sequentially, the rear after the front, so tuning is a bit tricky. Unfortunately the bike sustained some damage in the 2nd practice, so he was out for sunday.


With so many (should have been more) amazing bikes, the racing was amazing to watch. Jimmy and Tommy are so competitive, and both go all out. The derbi’s would take the straights but tommy would always be there in the turns and made passes then was passed and so on, and some how Pete got up front on Tony’s monster. Rufus was out there on his bravo as well, not quite as fast, but he gets quicker every lap, so he’ll be exciting to watch.


This beast was 62ccs, something like 6 or 8 hp. Nuts!

I managed to win the e50 polini class as I violated every rule in the book. CDI, disk brakes, 24mm carb, za50, all prohibited, all present. I managed to score a sweet 2 foot trophy and some points. Kick ass! Best of all the bike survived. My fastest lap was 47.something, not terrible for the bike (last year I think I got down to 43 on tom’s derbi, this time the fastest in open was around a 42, and last year the fastest fast was about a 40 by jeff) And for those wanting to race, top tanks are worth their weight in gold. So nice to have something to hang onto. For Gabe, I forgot to check my main in the flatslide, but its either a 165, 180 or 205. Sorry buddy!

So I’m pretty excited for later races, and I really hope more people head out. I’ll be honest, its pretty lame no one showed up. Obviously we all have things going on and whatnot, but come on. We have restrictive rules created for a race with 2 people showing up to ride? That’s exactly the point I guess. Even if you aren’t building something crazy to battle the fast dudes, get out there. Track time is a lot of fun. I’m bummed I have to miss the next one, but I am more excited for June.



magnum stuff

So hopefully you say gabe’s awesome polini guide, and I thought I’d show you mine. I’ll be honest, the quality of my work is subpar. The exhaust port is nice, but the intake embarassing. Regardless, it runs really well, and its done stupid speeds, and It’s going to only get dumber.

In the cylinder (exhaust raised a lot, widened a lot, intake opened completely) The little scuffs, one at the rear of the port and the other 2 in front were me not good at using a dremmel.

The intake, again opened up all the way, and I filled it a bit with JB because the malossi 4-petal has a lot of wasted space in there

Transfers opened up just a bit. The most important part is opening up the upper transfers. Plenty of meat on the cylinder, so its un-tapped potential. Also, remember you MUST open up the outer portion of the exhaust port to to actually match the flange of your exhaust. Polini’s are tiny, just a bit bigger than stock, but much smaller than 99% of expansion pipes (except proma circuit, they are a perfect match).

Paz originally built my ZA for some other fella in SF. He didn’t go super deep with the upper transfers, but everything is nicely done. A roller rod was pressed in at the same time. The crank has 2k+ miles on it, so super solid!

Thats my ugly polini. I’d like to get another one in the near future as I worry this one may be slowly heading out. It was seized before I bought it, and there is now a fair amount of discoloration on the nicasil around the exhust port. All the cross-hatching is gone. Compression is OK, but not as good as it could be. That, plus I’d like to re-port another with a lot more care.

So in semi-related news, I’m going to make this thing rip harder than it ever has. Either selettra or HPI ignition (selettra is a few OZs lighter, but I think HPI has a little better curve), and my flatslide mikuni.

I want to race something come april, and even though this probably won’t be competitive, with the right gearing (N8P forever!) it should have really good pull. I don’t want to scrape up my LTD seat or tank, so I’m going to be using a freespirit pan and my spare C5 tank. That plus my disk brake EBRs. My goal is to have it running and semi-tuned by tomorrow. I’ll keep posting. Whistler from the 20th to 27th!



racing vs. not racing
February 8, 2010, 2:15 am
Filed under: Projects | Tags:

I talked to tom a bit this weekend about racing, and I’m trying to figure out what to do. I want to race, but as noted, I have nothing to race. He is going to be making the derbi even faster (lots of horsepower) so it should be pretty exciting.

Apparently our buddy, the magical Mr. Naz has been building a pretty rad motor for tom. Well I might be piecing the rest together to make a moderate blaster. Something like 15hp, maybe more if we go bigger displacement wise, all with functional pedals. So I need to find something to put it on, and all the other bits to make it run. So yea, we’ll see what happens.



prototype
November 13, 2009, 3:13 pm
Filed under: Uncategorized | Tags:

this isn’t going to work. I do have ideas of what will. Its going to happen.

its going to be sweet!