fun on the dyno

check it, a few of us from 1977 went down to leovinci scoot a couple weekends ago and dynoed some of our race bikes, unfortunately they where not yet tuned or tested for the most part and where hoping to tun on the dyno, Dan was able to get his bike tuned up pretty good, Lee had his bike running well, and craigs bike was in a completely horrid state. My bike was untuned and we ran outta larger jets to really get a good run with it as I had to cover the intake with my hand while testing to try and manually restrict the airflow. Paz had his bike pretty dialed in and came up with an impressive hp #.

overall we learned that 24 mikunis give more power then smaller dellorto carbs back to back on the same setup, and that wide powerbands are significantly better vs peak hp for racing. A well tuned points ignition can rev higher then expected and produce hella power on moped applications. Also to come more prepared next time.

all in all this short vid pretty much sums up the experience of dynoing mopeds for the 1st time, it was a lot of fun.

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man, that first bike was just too much. making a run for it. lol

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Damn, I wish I had one of those.

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haha... i like how after it launches off the dyno, the next clip clip shows it strapped the fuck down.

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did the bikes make x,xxx rpm like stated at the end, or did you forget a zero?

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Tie Down FAIL!

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May i ask what model dyno you guys were running on?

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That was awesome. I feel bad for the dude with the exploded Peugeot.

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opps forgot the 0's it should read

paz za50 15,000

av10 moby 11,500

points peugeot 12,500

cdi peugeot 11,500

hobbit 8,000

i don't know the model of the dyno I know it was a dyno jet and they told us it costs $70,000 or something over $50 grand.

yeah lees peugeot made good power for the setup even on points, later on we diagnosed the problem to a circlip that came out but did not seize the piston instead it allowed the wrist pin to work its way outward and then finally catch on the bottom of one of the transfers this tore the crank in two and split the motor completely apart, it literally shredded thru cases in several spots, and halted the heavy ass drum on dyno during the process. I wish i was shooting then.

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where are the HP numbers?

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end of the video has the HP numbers

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fuck the peugeot. ugg.......

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i think the birth of the idea of fuel injected mopeds was caught on camera.

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Impressive!

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hardly. The idea of fule injected mopeds has probably been circulating for years, with no one to implement it. Derbi makes a 2 stroke fuel injected scooter.

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"if it makes you feel any better your winning..."

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thanks for posting that I have always wondered what the big motors would make.

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I think we also learned that the extent a kit made for "mopeds" is designed to take a bike is 8 maybe 9 hp with a few exceptions. 80 metras and other kits designed for Mofas or larger bikes will make more hp on a big setup, then there are even more impressive kits for scooters and such that as you saw took a za50 to 16 hp.

I'd say around 8 hp or 9 hp would be the fastest bikes ppl typically see at rallies. however on the track 10, 11, 12, 13, 14 + hp is probably what the fastest machines are making. But peak HP means nothing in a race if you can't stay in the powerband, so a variated bike with a nice wide powerband with less hp that peaks and stays there will always dust a non variated bike that is constantly jumping in and out of its powerband with more hp.

The other thing to note is power to weight ratio, I think thats uber important when we are dealing with such low hp outputs.

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Motomatic went to the dyno, and it left me even more confused than when we got there. My bike came in at only 9 hp. We were expecting atleast 10.5. Tony's came in at 13.5 hp. A bit better than we expected. Heres where things get weird. With 4.5 hp disadvantage, my bike had a better speed to time ratio than tony's. Which according to the guy running our dyno "was the most important graph for automatic transmissions."

Like elliot said, it is best to have a broad powerband for racing, which I guess is why I had such a good speed to time ratio. My bikes peek hp was 9, but my bike was at 7 hp by 14 mph, and stayed between 7 and 9 hp all the way up to 63 mph. If you look at tony's chart or pazs chart, they peek at 13 or 16, but fall to 5 or 6 at points in their power band. This is where having a properly working transmission comes into play. This is why bikes like mine or elliot, who although producing much less power, would probably win in a drag race against a bike like paz's or maybe even tony.

So yeah, dyno is fun and awesome, but doesnt exactly solve all the problems you are wondering, and hp and rpms dont mean nearly as much on an automatic transmission. Once I figure out how to produce around 11 hp and keep that broad band I have now, then we will really be talking. haha.

I attatched my dyno chart if people are interested. I hope 77 and motomatic both do this again at the end of the season. Its fun to see where we are at. It will be awesome to see what kind of improvements we can make from here.

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) Cupermcnewbster ( /

pretty cool. I'd like to see more bikes dyno'd. I think both motomatic and 77 have friends/sponsors running them, but any ideas on what it would cost for someone like me to do a few runs?

tommy, your HP is just right for the track. Although 9 might not be as awesome as you had hoped, its doing that basically at the speeds through the turns, so you have high exit speeds.

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Great thread, I was always wondering what kind of power people were making.

Hey Elliot, what main jet was that VM24 running on the dyno? I am just curious, I have a friend who runs a VM24.

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We had to pay for our time. It aint cheap. $100 per hour i believe. Tony paid for our time luckily, which is why his bike had about 30 runs, and mine about 3. haha.

Yeah, I honestly am not complaining about my power. Its nearly perfect for the track. I honestly would be fine with doing nothing to my motor before the next race, and just working out the quirk with my rear end and riding position so I can get through the track faster. I doubt the motor wont get touched though.

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Great! Job team 77, breaking stuff is the fun part. :) Ed

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everything in the far east is injected.

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Yeah I thought all the Italian scooters these days were injected. Which leads to a question - what the heck "scooter kit" is on that ZA50?

Great thread, thanks.

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King Drunky JCams /

Awesome.

I'm sure that was a blast to check out in person.

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scooter kits r top secret unless paz wants to tell ya.

but honestly riding paz's bike and riding my bike r 2 different things, like tommy said the tranny makes all the difference. I rode paz's bike outside leo to see what a 16 hp moped felt like and wow was it fast but it was also an unusable powerband. It was slow steady accl. till the pipe hit in 1st then bam strait up into a wheelie i had to lean forward over the bars to keep her down. (i'm not talking about some lame ass moped wheelie I mean like when a dirt bike throws u off in 1st gear and u fall) but then it drops right back outta the powerband when 2nd hits and ur lagging for a long time till the pipe hits again and shoots u into hyperspeed.

On the other hand my moby with half the hp just rides out smoothly without peaking but has a strong steady controllable pull all the way up to it top speed. also much better throttle response and overall rideability. The feeling from the moby is that it has more "pep" and seems to have the same power, also the top speed is greater even further eluding to the myth of a high hp #, but infact its just using what its go more efficiently.

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Do you guys feel like the blower fan gave a fair analog to the kind of air flow you would get on the street? If not, it might not have provided enough cooling to the fins or turbulance to carb. Also, dynos aren't really meant for smaller bikes like ours. They are a good tool for seeing what changes what with what set up, but a lot of variables don't get taken into account like total loaded weight including rider, wind resistance, and of course all the handling characteristics.

That being said, they are a good tool, but by no means the final word on how "fast" a bike is.

Cuperracer: Keep an eye out at your local powersports stores. I don't know if its the same all over, but around here there are a couple days a year when places truck in a dyno or two and just let people get there shit dynoed.

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can we all just take a second to marvel at what is quite likely the first 16 hp moped in america ever?

i fucking love you paz

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