There are two 44,000 CFM fans in the ceiling right behind the bike, they extract spent gases. I would like a smaller high vacuum system for the 2 stroke pipes though, we are on the same page there.
Well, in 300k miles of street riding and a decade of racing bikes I never have damaged a gearbox and I ONLY really use the clutch to launch the bike or leave a light/stop. Motorcycles are equipped with sequential manual gearboxes and they shift perfectly with NO damage if you have good timing and technique.
nicee one, what sprockets are you running to get your 90mph top speed. i have a gpr 50 new shape, and am currentlyrunninga 15 tooth sprocket on the front, and the standard 53 on the back. i was thinking perhaps a 50 on the rear would give me good top speed and acceleration. i dont want to loose alot of acceleration but was hoping for around 75ish top end. just wondering what your opinion was seeing as you have alot more knowlegde than me :) thanks
15f and 38-43t rears on this one. <y primary drive gear ratio set (Metrakit) and gearbox ratio's are non stock (Metrakit Pro Race Gearbox) though and motor revs pretty high but geared only for acceleration to a realistic top speed for roadracing.
With a 28mm carb, a Malossi race ignition and a bad ass pipe the bike you have can be tuned just like this one, you will have to perfect the ports to match the pipe but if you are committed to the idea then anything is possible.
hey i have an aprilia rs 50 too. i love it, i bought a kit that costed me 160 euros.. its 49 mm. can u explain me plz the tune settings of motogp ?? can i do it on my bike too? thanks. lovely sound <3
There is a big difference between the GP engines and any RS50 "kit" cylinders, carbs, pipes or parts. The only "kit" I have seen capable of doing the full mini GP state of tune out of the box is Metrakit's Pro Race series of parts. Used as a package they are close to spot on per cc with real GP bikes. The life of the parts though is also very similar, about 3-6 hours on a piston and about 20-30 on a rotating assembly.
It does have to do with port timing in a way. At 190 degrees of exhaust duration there is still a lot of cylinder pressure and the port opens very rapidly making a very sharp sound from the pipe. The 28mm open Keihin carburetor has a lot to do with the sound too. No airbox to muffle intake sound or filter. Two strokes actually make more intake noise than exhaust noise. It sounds bad ass because the engine is highly built. You should have heard the 24 bhp version with Metrakit Pro Race!
Agreed, on the "race" version of this motor at 77cc with 5mm stroker crank piston life was about 5 hours 43 minutes at 24 bhp. On the 20 bhp 50cc 15k rpm engines only a few sprint races are possible on a top end but at 15 bhp twice a season will do it for top ends and cranks once per year.
None of the stuff we ever managed to get here in the USA was worth the trouble. We had the supposedly "full" MHR modular head 50mm cylinder, with the intake, ignition and modified version of this pipe on the dyno and it was very unimpressive. When the bike had a 5mm stroke, on a Custom Metrakit Pro Race 47.6mm cylinder and head combo, and the same intake and even better version of same pipe and same ign, it was fuckin amazing, the clutch could not hold over about 24 bhp no matter what I did.
u must have just got the mhr speed kit,I think although they make several single ring kits now I think, for real results u want the mhr team speed kit more powerful than the metrakit so Ive read.
Theres another kit about made by an ex malossi engineer called the 2f4r (s fast 4 race) which has 7 transfers and 2 main exhausts and 2 small ports, have a look at scooterattacks website, they do that kit for the scooters I think its for bikes also, but its over 28bhp with 28mm carb!
I might get back into tuning on the RS50 one day and play some more. I have the luxury of some real deal RSW Aprilia cylinders and heads at the shop to look at and measure...when scaled they are literally almost identical to the Metrakit Pro Race stuff. I would really like another PR top end kit, that was the shizznit for this bike!
bare in mind the smaller the capacity the higher rpm for an equivilent port timing,
ie a 500cc single can have say 200 degrees but a 50cc with same timing will be massively top endy.
I know a bloke who had access to honda rs125 works cylinder etc kits, £20,000 for 3 or 4 cylinders and engines matched with 57bhp or so, u get honda technicians to help u at races also for about 3 hours!
True this, comparing a 54mm cylinder with 54mm stroke though does help with scaling the ideals for say a 47mm cylinder with a 39 or 44mm stroke. If you are still chasing RS50/AM6 power I BEG you to try a 44mm crank with the port timing mentioned above at 5.5cc head volume with a good pipe, you will freak!
I have not used the clutch to upshift a bike in probably 15 year. Sequential transmissions will work perfectly if you just unload the tranny by closing the throttle a little bit while holding pressure upwards on the shift lever...or down in race shift pattern. On the track I rarely even use it for downshifting, just rev match. I have never broken a transmission either.
Well it blew up after less than 2 hours of run time...so it really was pretty strong. The best runs ever on a true 50cc for me were 15.7 bhp and on 77cc 47mm bore/44mm stroke were about 23-24 bhp but clutch slipped badly recording only a little over 22 bhp which was all it could hold
The Malossi modular head kit sent to me, had absolutely no difference in port timing compared to the standard 50mm malossi kit, this is why the porting tools came out. The Metrakit Pro Race series of parts is by far the best I have used. Yes, carb is 28mm. Bike is at the track right now, see if it survives this weekend.
Very few Malossi parts are sold in the USA, and we get NONE of the trick stuff.Hell even getting stock RS50 parts in the USA can be hard. This cylinder kit required no special fitting of the cases.
I plan on going either Hebo or back to MetraKit Pro Race for next season. Bike took third in class in its three hour race this weekend. Taxes are pretty much f-ing high on imports everywhere, USA probably lowest import tariff's?
I think in england we only pay 17.5% and r charged no extra from europe, european union etc etc.
Our prime minister just signed away britain to europe! promised a referendum but changed a tiny part of aggreement so he could get away with ignoring us! ireland voted no, so europe wants them to vote again and again until its a yes!!
wow do so many people NOT know how to drive WITHOUT a clutch??, wow the lack of experince!
aggiez 4 months ago
Surprised you dont route the exhaust fumes outside with a tube connected to the muffler tip..
aydinvideo 7 months ago
There are two 44,000 CFM fans in the ceiling right behind the bike, they extract spent gases. I would like a smaller high vacuum system for the 2 stroke pipes though, we are on the same page there.
MicahShoemaker 7 months ago
I'd say that's real good for the gearbox..use the clutch
92scooby 1 year ago
Well, in 300k miles of street riding and a decade of racing bikes I never have damaged a gearbox and I ONLY really use the clutch to launch the bike or leave a light/stop. Motorcycles are equipped with sequential manual gearboxes and they shift perfectly with NO damage if you have good timing and technique.
MicahShoemaker 1 year ago 4
@92scooby Learn about motors and gear boxes
aggiez 4 months ago
kupplung?!
MrExplor 1 year ago
nicee one, what sprockets are you running to get your 90mph top speed. i have a gpr 50 new shape, and am currentlyrunninga 15 tooth sprocket on the front, and the standard 53 on the back. i was thinking perhaps a 50 on the rear would give me good top speed and acceleration. i dont want to loose alot of acceleration but was hoping for around 75ish top end. just wondering what your opinion was seeing as you have alot more knowlegde than me :) thanks
0l0Dom0l0 2 years ago
15f and 38-43t rears on this one. <y primary drive gear ratio set (Metrakit) and gearbox ratio's are non stock (Metrakit Pro Race Gearbox) though and motor revs pretty high but geared only for acceleration to a realistic top speed for roadracing.
MicahShoemaker 2 years ago
okay thanks, i will look into it :)
0l0Dom0l0 2 years ago
but can i tune my bike like yours?
Katsuranisk 2 years ago
With a 28mm carb, a Malossi race ignition and a bad ass pipe the bike you have can be tuned just like this one, you will have to perfect the ports to match the pipe but if you are committed to the idea then anything is possible.
MicahShoemaker 2 years ago
hey i have an aprilia rs 50 too. i love it, i bought a kit that costed me 160 euros.. its 49 mm. can u explain me plz the tune settings of motogp ?? can i do it on my bike too? thanks. lovely sound <3
Katsuranisk 2 years ago
There is a big difference between the GP engines and any RS50 "kit" cylinders, carbs, pipes or parts. The only "kit" I have seen capable of doing the full mini GP state of tune out of the box is Metrakit's Pro Race series of parts. Used as a package they are close to spot on per cc with real GP bikes. The life of the parts though is also very similar, about 3-6 hours on a piston and about 20-30 on a rotating assembly.
MicahShoemaker 2 years ago
that 50cc bike sounded AWSOME !
how come it doesent sound like the other 50cc
is it something to to with "Exhaust port was cut to open at 19mm"
can i do that to mine, if i get one
freaza39 2 years ago
It does have to do with port timing in a way. At 190 degrees of exhaust duration there is still a lot of cylinder pressure and the port opens very rapidly making a very sharp sound from the pipe. The 28mm open Keihin carburetor has a lot to do with the sound too. No airbox to muffle intake sound or filter. Two strokes actually make more intake noise than exhaust noise. It sounds bad ass because the engine is highly built. You should have heard the 24 bhp version with Metrakit Pro Race!
MicahShoemaker 2 years ago
anything over 9bhp on a 50cc and you get a very short engine life... it gets expensive
MrSiddeney 2 years ago
Agreed, on the "race" version of this motor at 77cc with 5mm stroker crank piston life was about 5 hours 43 minutes at 24 bhp. On the 20 bhp 50cc 15k rpm engines only a few sprint races are possible on a top end but at 15 bhp twice a season will do it for top ends and cranks once per year.
MicahShoemaker 2 years ago
I thought the malossi race kits get about 20bhp+ out of the box.
tpvalley 2 years ago
None of the stuff we ever managed to get here in the USA was worth the trouble. We had the supposedly "full" MHR modular head 50mm cylinder, with the intake, ignition and modified version of this pipe on the dyno and it was very unimpressive. When the bike had a 5mm stroke, on a Custom Metrakit Pro Race 47.6mm cylinder and head combo, and the same intake and even better version of same pipe and same ign, it was fuckin amazing, the clutch could not hold over about 24 bhp no matter what I did.
MicahShoemaker 2 years ago
u must have just got the mhr speed kit,I think although they make several single ring kits now I think, for real results u want the mhr team speed kit more powerful than the metrakit so Ive read.
Theres another kit about made by an ex malossi engineer called the 2f4r (s fast 4 race) which has 7 transfers and 2 main exhausts and 2 small ports, have a look at scooterattacks website, they do that kit for the scooters I think its for bikes also, but its over 28bhp with 28mm carb!
tpvalley 2 years ago
I might get back into tuning on the RS50 one day and play some more. I have the luxury of some real deal RSW Aprilia cylinders and heads at the shop to look at and measure...when scaled they are literally almost identical to the Metrakit Pro Race stuff. I would really like another PR top end kit, that was the shizznit for this bike!
MicahShoemaker 2 years ago
bare in mind the smaller the capacity the higher rpm for an equivilent port timing,
ie a 500cc single can have say 200 degrees but a 50cc with same timing will be massively top endy.
I know a bloke who had access to honda rs125 works cylinder etc kits, £20,000 for 3 or 4 cylinders and engines matched with 57bhp or so, u get honda technicians to help u at races also for about 3 hours!
tpvalley 2 years ago
True this, comparing a 54mm cylinder with 54mm stroke though does help with scaling the ideals for say a 47mm cylinder with a 39 or 44mm stroke. If you are still chasing RS50/AM6 power I BEG you to try a 44mm crank with the port timing mentioned above at 5.5cc head volume with a good pipe, you will freak!
MicahShoemaker 2 years ago
I'd love to but where I live bikes get stolen as soon as u buy them, 8 attempted break ins in 3 months after my kmx125 and malossi scooter!
So I drive a car and have warmth.
But yes, rs125 port timing on an 80cc would be very top endy! about 15,000rpm?
are u interested in old kriedler race bikes at all?
tpvalley 2 years ago
Love the old Kriedler bikes and engines, very rare to see one here in the USA. You have one?
MicahShoemaker 2 years ago
no but they raced them near me a while back in classic 50cc racing, weeeee, weeeeeeeeeee, cac cac weeeeee...
tpvalley 2 years ago
Too cool. Would have loved to see that in person!
MicahShoemaker 2 years ago
you can change the gears without the clutch when upshifting, when downshifting you need it
bac325 2 years ago
I have not used the clutch to upshift a bike in probably 15 year. Sequential transmissions will work perfectly if you just unload the tranny by closing the throttle a little bit while holding pressure upwards on the shift lever...or down in race shift pattern. On the track I rarely even use it for downshifting, just rev match. I have never broken a transmission either.
MicahShoemaker 2 years ago
mine has erm 15hp??
its 70cc and stuff Lol
owens10101 2 years ago
hey this is good
I sit here in Norway and I buy parts, get advise from Af1 great place. My thanxx
to Ed for all help sofar.
I run a tuono 1000 r fac 08 mod. great bike, and I have a ducati monster yes also great bike, next will be augusta,,,
any advise???
janolafrisnes 3 years ago
Well it blew up after less than 2 hours of run time...so it really was pretty strong. The best runs ever on a true 50cc for me were 15.7 bhp and on 77cc 47mm bore/44mm stroke were about 23-24 bhp but clutch slipped badly recording only a little over 22 bhp which was all it could hold
MicahShoemaker 4 years ago
if u bought the modular head kit u can get 25bhp out of the box!
same with metrakit pro-race.
as standard the race kits get about 16bhp.
Did u remachine head to regain compression lost by raising ex. port?
Use only synthetic race oil, that castor stuff eats plugs!
what carb u running? 28mm?
use selletra ignition.
tpvalley 3 years ago
The Malossi modular head kit sent to me, had absolutely no difference in port timing compared to the standard 50mm malossi kit, this is why the porting tools came out. The Metrakit Pro Race series of parts is by far the best I have used. Yes, carb is 28mm. Bike is at the track right now, see if it survives this weekend.
MicahShoemaker 3 years ago
interesting.
The ports on the team kits r "worked on" (?) by mallossi engineers hence the extra price!?
The official figures r around 16 mhr and 25 team kits.
why not just buy a modular head and skull to fit on your kit? extra cooling.
Have u seen the 2f4r malossi kit with 7 transfers? costs an arm and a leg and a hand and a foot!!
what clutch r u using?
do machine cases on this engine to fit cylinder spigot?
tpvalley 3 years ago
Very few Malossi parts are sold in the USA, and we get NONE of the trick stuff.Hell even getting stock RS50 parts in the USA can be hard. This cylinder kit required no special fitting of the cases.
MicahShoemaker 3 years ago
I was just looking at malossi catalogue.
The mhr kit has 9 less bhp than modular head!
Also for about $1200 u can get the malossi modular head team "tuned by mallossi" kit!
7 transfers and I think 4 exhaust ports! 2 main, 2 aux.
I dont know what kit u got but the mhr kits (team) need spigot crearence machining on crank case!?( all the scooters do (minarelli engines)).
Want me to post u one?!
tpvalley 3 years ago
my dad posted a home built steam engine to canada and had a real chew on with tax and paperwork.
Something to do with stopping imports ruining home industries?
tpvalley 3 years ago
I plan on going either Hebo or back to MetraKit Pro Race for next season. Bike took third in class in its three hour race this weekend. Taxes are pretty much f-ing high on imports everywhere, USA probably lowest import tariff's?
MicahShoemaker 3 years ago
I think in england we only pay 17.5% and r charged no extra from europe, european union etc etc.
Our prime minister just signed away britain to europe! promised a referendum but changed a tiny part of aggreement so he could get away with ignoring us! ireland voted no, so europe wants them to vote again and again until its a yes!!
japanese imports kill home industry though.
tpvalley 3 years ago
18 True HP on a 50??? That's crazy strong! That would be a 90 True HP 250 - and national winning AMA TZ and RS 250's make 66 to 80 True HP (
marc3075 4 years ago
250 got loads of movin parts, they all sap power lol
mongoose301 4 years ago
Not sure I understand mate?
MicahShoemaker 4 years ago
wtf was dagt?
polskaowenz123 4 years ago