rs 125 in a rs 50 will it fit?

[chalky143]

Hi i have just got given a rx 50 which has the same engine as a rs 50...and im using it for a piss about., would a rs 125 engine fit straight in?

thankyou
leon
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Current bike :: sv650 minitwin race bike
Previous bikes::cbr600 steelie race bike, 1989 Honda vfr750f, 2013 Honda fireblade, 2013 Ducati multistrata 1200s, 2012 Triumph street triple R, 1999 yamaha r6, vfr 800, ducati 600ss, vfr 400x2, ntv 650, bandit 600, cagiva mito 125, aprilia rs 50, honda c90x2, honda hornet 600x2, cbr 600, aprilia rx50, suzuki katana
My bike pics: https://www.bikepics.com/members/chalky143/

[Wafer_Thin_Ham]

need a lot of work, the chain runs on the opposite side on the 125 motor.
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[Kickstart]

Hi

Yes, major differenes. Substantially larger engine, different ignition system, different tacho drive (think), chain on the other side, quite likely radiator pipes on the other side, etc.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[_Will_]

[mini hijack]

Whilst you're reading Keith, why is that, i've never got the reason behind the chain on the other side.

[/mini hijack]
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Past -Honda qr50 | 2004 Peugeot Tkr s 50| | 1996 Yamaha XJ600s Diversion|

[Wafer_Thin_Ham]

[calum17]

[The Tot]

I thought the Rotax lump was used in karts? Am i right in thinking that carts have RHS chain drives linking the engine to the rear wheel? I've never thought that myself too. Makes it a damn sight difficult to swap with another engine i suppose.
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The Tot 2019 Z1000SX - 2007 R1
Never argue with autism

[Kickstart]

Hi

Chain thing seems to be an Austrian hang up. The RS125 uses an Austrian Rotax engine and they pretty much all have the chains on the right (as do most KTMs it seems).

Suspect it is to do with a preference for a kick start that you use while standing beside the bike, and it is easier to have a kickstart on the clutch side. That means putting the clutch on the left which leaves the chain on the right.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Wafer_Thin_Ham]

Who supplies the 50 engine then??

Aprilia themselves?
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[Fahd]

[01dabreoo]

[Fahd]

[MaybeGuy]

chain on the wrong side?

flip the wheel around!
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[Wafer_Thin_Ham]

[MaybeGuy]

pff, chain slider?? bit of blue tack works for me...
as for the back brake... take it off, no one needs it anyway
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[Wafer_Thin_Ham]

[Groove]

[MaybeGuy]