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!


January 11, 2010, 12:50 pm
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Most people like puchs. I like my magnum, but thats about it. After a lot of them, I was bored. So I traded my nice swinger (originally with a za50 and 5 stars, now with flakes and an e50) for a sweet sachs g3. I used to have a general with a 505 that I really liked, so I figured I ought to get a sachs because they are pretty bad ass.

Outgoing swinger:

So I traded for this pretty G3 with a 505-1D. It runs pretty well and is in pretty good shape. The coaster brake is weird, but overall I’m pretty excited. Maybe one day I’ll get it a 2 or 3 speed motor. Now all my mopeds are either all or have some red. Pretty sweet!

New G3:

whats going on.
November 23, 2009, 12:13 am
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I’ve got a lot on the plate for this week.

I got my magnum running yesterday. The petcock started leaking just before the ride today, so I had to make a an o-ring out of fuel line on the spot. Its running super solid, I always forget how this moped is the best moped ever.

cleaning and sealing the ltd tank this week, finally.

this is the ugliest pipe ever. Originally a tomos estoril, its survived a lot. The pipe was derestricted, the silencer has fallen off numerous times, the header has snapped a few times, etc. Somehow it still works fine, and take my brother’s tomos to crazy speeds.

broken polini cup derbi motor.

most fun bike ever. Currently disabled.

need a stock cylinder or some old tires?

getting vespino ready to ship out to kentucky. fits in the box, just gotta pack it properly now.

happy magnum
July 23, 2009, 11:37 pm
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after several months down, my magnum is back, alive and doing very well. The 2 speed feels great, new rear wheel bearings are smooth, and it hasn’t missed a beat. I am trying a few cdi boxes out, and working on getting all the power I can. Currently running with my n8p which really hits hard in 1st, but lulls a bit in 2nd before hitting again around 45-50, then pulls decently well. 60+ no problem. My old CDI box had more pull though up top, so some switching is in order. LTD tank is awaiting POR15, so my brothers silver tank will do for now. I forgot how fun this bike is.

This is on as well. I wanna go fast! Race tech developments are going well.

limited rebuild
July 2, 2009, 4:53 am
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So back in LA I noticed the rear wheel of my magnum had a little bit of play in it. I proceeded to blast a lot of people and hit personal land speed records. The other day as I rolled the limited on the stand I noticed the rear wheel now had about an inch of play (at the tire) and I dunno, I guess thats bad. So I pull the wheel apart and find some nice bearings. One is all crusty, the other looks almost decent, but 1 or 2 balls are dislodged from the cage and they move around way too much. I don’t want that blowing up at 55, so new bearings are in route.

The motor is getting closer, and now I have a lot of CDI boxes to try. I’ve got the OG hero box that I used for a few months that ripped, but benji thinks these others may in fact be a little better, so we’ll see. I’ve got these 3 to test and the other box is currently living on derbi if I need it.

I got a place to live, so now its time to finish the mopeds. I’m going to bring derbi (i think i decided on variant sport frame over ds50), and I need to finish the white magnum and sell it, just a few cosmetic touches there, and I want to get the limited running just as well as it did before, and I’d like to station that in the city for moped rides, and I need to get my racer tidied up for the september (maybe july???) races. So yea, I’ve got a lot to do. All must rip. Oh yea, fixed my friend’s derbi, turned out a ground was disconnected. Super nOOb

AAnother magnum!
April 22, 2009, 4:35 am
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So about a week ago I had a wanted ad up on craigslist. This guys, who happens to be just around the corner emailed me saying he had a nice magnum II thats been apart under his workbench for the past 10+ years. Fast forward to today, my brother and I drive down the street, and he unveils a really nice magnum. Its silver with spokes and pooper forks, za50, perfect seat, mediocre paint, and a perfectly clean tank. This is going to be my brother’s moped, so he offers the dude $150, and he says no, he’ll take $100! He goes inside and pulls a stack of paper work, including the original receipt, and the original registration. It sold for $799 back in ’81, and came from a shop in Mountain View (from which a handful of my previous mopeds have originated). He said he was going to take it to the dump this week, and was super stoked for us to buy it off him.

So there you have it, magnums still exist in yards, garages and other misc. spots even in some of the most “plucked” moped areas. They are still out there hiding, waiting to be rescued.

Tentative plans call for a near replication of my setup. Polini za50, phbg, circuit, etc. Its a solid setup that does 55 and gets there quick, a real winner. Lucky for him I have tons of extra parts. Updates to come as the bike is reassembled and upgraded.

Kind-of Limited
March 22, 2009, 5:41 pm
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So I threw my limited tank on thinking it was clean, but its not. Shit clogged my carb really bad and I don’t have the time before LA to properly clean and coat the tank, so it will be a one of a kind-of limited. It running really well, my same polini setup on a za50. 20t front sprocket coming soon for crazy speeds. Maybe you will be passed by this ugly thing at LA. When you see the brightest headlight ever, its this bike. I’m pretty excited cause all my mopeds are running well, and I’m done for rally action so I can just study for finals this week. You are probably jealous.