View Full Version : Micah did you race against those OZBIKE MetraKit Bikes
05-10-2003, 01:50 PM
Micah did you race against those OZBIKE MetraKit Bikes 50/80cc? and are they faster then the rs50 stock and kitted?
micah apriliaforum com
05-10-2003, 05:00 PM
I did not race against them....but from the spec sheet I would say they are definitely faster than the RS50.....by virtue of weight alone.
05-10-2003, 10:04 PM
I saw those bikes last year and they kick everyones ass. They actually changed the rules over here and said they had to run stock Derbi parts, not stock Metrakit parts. This was for the Mod 50cc class.
05-11-2003, 10:24 AM
I wished we had some OZbikes, or a big Derbi team in this area. Everyone is so spread out, so nobody really gets to see how one teams bike holds up against the next.
In the California the Derbi guys are saying that they're spanking the RS's, but here in TX it's the opposite... I imagine all of dominating bikes from each area are being tuned very well, and there'd be some really close racing if we got them all together at one track. Maybe one day it'll happen...
05-11-2003, 05:39 PM
Micah how well will your bike will do against one ?
micah apriliaforum com
05-11-2003, 08:20 PM
I will need at least 4 more bhp to fight one....maybe 5 or 6. That is like 18-20 bhp. I know I can get there with our bike but have so little time to mess with it right now.
05-11-2003, 10:54 PM
The Derbi and Metrakit distributors are located here in Portland. It looked like they were a factory team from MotoGP. All of them were where the same shirts and had tons of parts for repairs and tuning. Nobody could touch them last year.
I also can't say enough good things about the Derbi distributors. They helped me out big time when my local dealer shafted me on warranty work. Customer service is the best I have ever seen from a manufacturer.
05-12-2003, 12:41 PM
Does anybody have a link to the OZbike or Derbi racing stuff here in the US?
The hp numbers that I was quoted by a Derbi guy was total B.S., he threw out hp numbers that a new CR85 would struggle to produce :rolleyes: . I know most Derbi's are 75cc's so I don't doubt that they're fast, but the hp numbers were stretched a bit.
05-12-2003, 01:12 PM
A Metrakit Derbi showed up at the last race weekend in Norcal. After deliberation, it was decided that ,even though it only displaces 50cc's, it had to run in the 80 class.
Per our rules, water-cooled bikes must run OEM cylinders, heads, cranks and ignitions, all of which are aftermarket on the Metrakit Derbi.
I am hoiong that next year we can get the rules changed. I could see the AM6 motor performing pretty close to the Metrakit Derbis if we can _all_ run aftermarket parts.
This bike _will_ force rule changes throughout the little bike racing organizations.
05-12-2003, 04:52 PM
Beating a few Mori 80's isn't a big deal, but some of the specs are pretty impressive... 120 lbs :eek: , yeah they have about a 40 lb weight advantage. The stuff like the 12 inch magnesium wheels, the frame design, use of aluminum rather than steel (RS has steel subframe and swingarm), and the tiny fuel tank is where some of the weight is shaved. How big are the MetraKit bikes? If the wheels are 12" then I'm guessing they're about like a NSR50 (just a little bigger than a YSR50).
They're pretty trick bikes...
05-12-2003, 05:14 PM
Don't forget the size of the pilot. Looks like they have small kids racing them. Fearless and weightless..:rollin:
05-12-2003, 05:16 PM
The kids they had riding for them in Portland last year were young and fast. One of them was supposedly vying for the Spanish 125cc championship...
05-13-2003, 09:14 AM
having a 40 lb bike advantage + another 80 lb rider advantace (rider in the pic can't be more then 70-80 lbs in full gear) = a HUGE advantage over the older and out of shape adults. Just adding a normal size rider to that bike would be eqivalent to losing 5-6hp compared to when the little guy is riding it. Did they have any adults racing the OZbike? If so I'm sure it levelled the playing field a bit more than with the mini-me kid in the picture.
05-13-2003, 11:08 AM
April this year Phil Herrin (Josh's dad) raced the MKD (Metrakit Derbi) at Prairie City in Norcal. Josh is too young per our rules to race in the 80cc class. Phil was not able to keep up with the 80cc bikes running here, but it definately was faster than any of the 50cc water cooled bikes we run.
05-13-2003, 12:08 PM
OK, the Dad's results sound about right since the average rider is 160-210 lbs for guys and 100-140 lbs for female riders.
Since we're on the subject of Derbi's, how did the motard Derbi's and the Derbi GPR75's compare to the MKD 50cc race bike? I was given a lot of bogus info that made it sound like the all of the new Derbi's were just in a class of there own. I don't doubt that the MetraKit parts could drasticly improve the performance since you're replacing all of the limiting factors to make it more like a blueprinted motor... but using the stock Derbi GPR or motard tranny & cylinder the bikes aren't gonna be any different than a RS with equal tuning.
I was given the whole "our Derbi's are so much better" B.S. by someone that sells them, so now I'm just trying to seperate fact from the ssssttttrrrretched fiction... ;)
Thanks for the info!
05-13-2003, 01:02 PM
Fact: The stock Derbi motor puts out 9 CV (Cheval Vapeur - Metric Horsepower), equivilent to 8.87688331 US hp. The RS50 (AM6 Minerelli motor) puts out around 6hp. Micah should be able to confirm the AM6 hp.
Fact: MKD motor uses aftermarket cylinder, head, crank and ignition. Norcal rules dictate use of OEM parts listed above for both the Derbi and the AM6 motors.
Advantage: Derbi (and MKD)
As to how close we can get the AM6 motor performance wise to the MKD, I have no idea, but we are working on it...
05-13-2003, 01:48 PM
The stock Derbi motor also have a 14mm carb where the RS50 has a 12mm. So in the stock classs the Derbi does have an advantage over the RS50.
05-13-2003, 02:23 PM
Luckily for us in Norcal, we have no "Stock" class for the water cooled bikes.
If we can get a new promoter next year, I will be petitioning for a "supersport" style class for the motards that are starting to show up here in the states.
Minimal mods: Unmodified stock carb (except jetting allowed), aftermarket pipe, no cylinder or head work, slicks allowed.
That would keep the costs down, the fun factor up and may the best rider (and not bike) win.
05-13-2003, 03:42 PM
so can u buy these things i look well mint!!
05-13-2003, 05:15 PM
Thanks everyone for the input thats why i love this site and forum. I have raced one of these Derbi GPR75 they couldnt keep up with my RS75 cant wait to race some more of them we have a good bit of them here .Also the NSR50 AND 75 they are not so fast. I beat NSR50 in a race when my RS was a 50 and was hanging with a NSR75 till a open flat came up then he left me behind .But im looking for him now that i have the bike fully Kitted.I am thinking about buying one just for racing .We have a open class for all gp type bikes like the Derbi GPR's , NSR's, RS up to 100cc .There is no 80cc or 100cc for the RS is it ? Besides the AIRSAL. I know some people here that had 100 kits for there NSRs .They where fast ,but i dont see them on the island any more. Thanks Again Everyone.
RIDE HARD N RIDE SAFE
05-13-2003, 09:23 PM
Most Derbi's come as 75cc bikes, so the extra couple of ponies are expected in stock form. Your info is pretty much what I thought they'd put out, but the dealer tried to say they were getting 20hp stock and 30hp with the kit... which I knew was impossible since a new CR85 moto-x bike only gets around 30hp.
Not sure what the Norcal rules allow but using the stock 50cc configuration with some cylinder porting, Jolly pipes, and a bigger carb the horspower for the RS can easily be doubled. Now that we've heard from someone who has seen and raced against the MKD I think it's safe to say that a well built RS could give them a run for their money... no doubt. Right now the AF1 built 50cc bikes are keeping up with the Honda RS60 (rs125 chassis with kx60 motor) that's dominating MW in this region, and the back markers from the HW 80cc class. With more time there will definitely be more motor and chassis upgrades tested, so things will only get better!!!
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