Aprilia rs125 350 engine conversion

[@HazzaParker]

Could recognise that engine sound from anywhere, love it!

[@TheMustafaish]

Beautiful build! Sound, looks and smell all in one bike and it must be a hoot to ride.

[@collectivepitch8656]

Never Seen a better conversion in a RS 125💥♨️🆘😍👌🥳

[@stevenwilson9751]

Thank you, I appreciate the comment

[@stevenwilson9751]

Hi Harry, alas, the bike has been sold to make way for a new project :) It looked great with the full fairing fitted and was lucky enough to win the best special award at the 2015 annual 2-stroke gathering! :)

[@normallydefective]

Omg that's mh old bike, or at least the registration number... I'll never forget R504KWT... I owned that for around 7 years (as a 125cc...) I'm in Total shock 😎

[@stevenwilson9751]

I'm glad you've seen it and hope you like what it became :)

[@luckharold]

Beautiful conversion. Thanks for posting. I love and i have two stroke bike in Brazil. Congratulations.

[@aydinvideo]

Very nice execution. I built a goofy little bike, it was a RS50 chassis that I put a YZ125 engine in- turned out good, but I didnt put the quality into it you did with this bike. In the end, I'd rather just ride the fuck out of a fast bike then build them now, so instead of fabrication videos I just make riding videos, but your bike here is probably the best build custom 2t I've yet seen. Great work.

[@lukecollins9798]

What engine is that mate I like it ?

[@abelgonzalezmartin7196]

I am impressed with the project, in Spain there are many who want to do this but nobody has managed before you could give small instructions on how you have adapted the rd350 engine to the aprilia rs 125 chassis, have you changed swingarm? you could put a list with the main changes

[@stevenwilson9751]

Hi, and thank you. The frame was extensively modified by cutting out the original engine mounts and welding in new ones. The rear shock mount was relocated and a ZX6R shock fitted, swingarm changed for a YZFR125. You can see the project pictures from start to finish complete with full fairing fitted here - s682.photobucket.com/user/fishbarf/library/Buildoff%20Bike%202014

[@speedyakakevin]

I would like to view the build pics tried using the link but I just get an error message 😢

[@charliemcfadyen7814]

Jesus what a machine

[@stevenwilson9751]

Yeah, i miss this one very much!

[@BigG-grant]

this should be 18+ this is bike porn !!!

[@choco107]

Very nice , does the rear engine mount go through the swingarm pivot , what mm where the mounts and have you any photos of the conversation,did you make the pipes yourself ? that yzfr swingarm looks beautiful

[@stevenwilson9751]

Hi, thanks. The rear engine mount is seperate to swingarm pivot. I have plenty of photos of the whole build

[@choco107]

@@stevenwilson9751 just spotted it on the site thanks :)

[@choco107]

What site is this build thread on again ??

[@paulrhodes2682]

That's awesome mate,I'm looking at this kinda project for my self! roughly how much did this set you back please?

[@maxkatana.8555]

hey Great respect im planning exactvthe same projectbin the momemnt. what exhaust do you have on this beuty?

[@stevenwilson9751]

Hi, they are Nikon pipes for a 350lc, modified to suit the Aprilia chassis

[@maxkatana.8555]

@@stevenwilson9751 hi ive some more questions to the build. can you send me your phone number so maybe you can help me a bit via whatsapp😉

[@maxkatana.8555]

And why the zx6r rear shock?

[@turbinebass]

...Yes so good, best work...

[@chrisgarland1658]

Lovely job what swingarm did you yous? I'm struggling to find one to convert an rs thanks

[@stevenwilson9751]

chris garland -thanks. it's a yzfr125

[@quinleybrown9921]

do you know the person you sold it to would like to buy it🤞🤞🤞

[@denbols]

nice bike !!!!!!

[@Vruuzex]

can any 1 help me pls iv got 1994 sem aprillia rs rotax 123 (ingnition coil is broken no spark) there are 4 wires red/green/black/and 2 into 1 red,white strip i changed coils but which wires go were? on High Performance Racing HT Ignition Coil thxxx

[@harryhambrook92]

More videos!

[@DEADmetal3]

Torque is much higher than stock. Can't it bend the frame or rear fork?

[@stevenwilson9751]

Žilvinas Deveika -hi and thanks for the comments. the frame was braced around the swingarm pivot and side rails to eliminate flex from the additional power

[@DEADmetal3]

Why didn't you use RS 250 engine instead?

[@stevenwilson9751]

Žilvinas Deveika -this was built for a competition and my idea was to mate an engine and frame from different manufacturers.

[@DEADmetal3]

What were the technical problems? Was it hard to make the mounts? Is it aligned within factory spec? I was thinking of doing RS 250 engine swap for my RS 125, so i'm curious.

[@stevenwilson9751]

There were many problems with this. Not least the swingarm as the 125 chain is on the opposite side. The modifications to suspension linkages and swingarm / swingarm pivot, frame etc were extensive. Wiring had to be done from scratch. Your problems will also be plenty but very different if using the RS250 motor. Have a go and don't give in! :)

[@ricardo1687]

hello my friend i am right about now to do the same conversion . what swingarm did you use ?was an easy converion? how is the bike riding now?

[@stevenwilson9751]

Hi, the swingarm is from a YZFR125 but the conversion wasn't easy at all. The whole of the rear frame mountings for suspension and engine were cut away and re-positioned. The bike rode and handled very well though :)

[@ricardo1687]

thank you mate does it vibrate too much?

[@stevenwilson9751]

It vibrates a little on tickover and low RPM due to the huge carbs unable to deliver fuel/air smoothly but once on the move, it isn't a problem at all

[@0141star]

Oh so good what engine is that sounds great what a bike

[@stevenwilson9751]

allan reid Thanks, it's an RD350LC with programmable ignition, 36mm flatslides, YPVS reed blocks with carbon reeds, lightened flywheel and modest porting.

[@0141star]

No joke I was actually looking at the 350 lc engine that is an absolute peach n one of a kind enjoy and ride safe

[@stevenwilson9751]

allan reid Cheers pal, get yourself over to the 2strokeforum, lots of builds going on that would put this one to shame :)

[@0141star]

I nearly lost my leg last year in a motorbike crash I'm crippled now unfortunately. I took my bike yday out a run on the anniversary of my crash still love riding bikes but spent a lot o time spanner in hand messing with bikes this past year that is inspiring seeing your bike Maybe an engine swap is on the cards for my aprilia I'll have a look for that forum u mentioned cheers

[@pearman2477]

What swing arm

[@stevenwilson9751]

Yamaha YZFR125

[@pearman2477]

Thank you for your reply

[@deaneyre800]

What's the swingarm off? I want to do this conversion but rs125 is right hand chain drive not left!

[@stevenwilson9751]

Yes, the swinger causes a problem. I put a modified yzfr125 in the back but you have to change shock mount positions on the frame also

[@maxkatana.8555]

how did you fit the ymaha swingarm? what axle did you use. rs or yamaha one

[@stevenwilson9751]

Hi, the aprilia bearings and end caps were put into the yam swingarm. Original aprilia spindle was used and custom spacers made to line things up.

[@maxkatana.8555]

cool thanks for your fast answer. Did you change something on the front brake or fork?

[@stevenwilson9751]

The front brake was fine with braided hose and sintered pads. Forks are a strange setup with one for damping and one for compression. It had a stiffer compression spring fitted and slightly heavier oil in both. They worked ok for road use and the little time it was on track

[@stevenwilson9751]

A note worthy of pointing out, the whole rear shock mount on the frame was cut out and relocated to the centre as the original is off to the right.

[@maxkatana.8555]

Ok cool of you want you can write me on whatsapp i alteady started the project. [phone]

[@Tom-mi9mr]

that is so nice, what engine is that? i have the same model rs125

[@stevenwilson9751]

Hi Tom, it's an RD350LC. Thanks

[@jayengland265]

Steven Wilson i knew it lol , before i even clicked i knew it was going to be an RD350 haha

[@bazjumper]

Hi Steven, Where did you get that tail piece from? :)

[@stevenwilson9751]

Hi, Can't quite remember but think it was Greece or Germany. It was certainly imported into the UK though as I couldn't find one anywhere over here.

[@cracktasticjc]

Ebay buddy i just bought one from germany 80 quid

[@trajcenaskovski271]

hey I have an aprilia rs 50 from 2009y. Just wanted to know is it possible to set an yamaha rd 350 ypvs machine in the chassis of rs ? any thoughts ?

[@stevenwilson9751]

Hi, anything is possible with time, money and effort. Probably not a wise decision though as the RS 50 frame isn't as well made as it's bigger brothers. The 125 chassis are cheap enough and well worth thinking about as long as you consider the chain being on the wrong side with standard swinging arm.

[@liam-lh2nm]

How much fabrication was done to make it fit?

[@stevenwilson9751]

Lots! the mods to the frame were extensive in order to relocate the rear shock mount and swingarm to suit left side chain drive. Once that was finished, the rest was easy :)

[@liam-lh2nm]

@@stevenwilson9751 fair play to you though looks like it paid off far better than imagined those graphics are smart do you know how I could buy them or potentially get similar ones cheers

[@stevenwilson9751]

Thanks :) , Any graphic maker on ebay could replicate them for you

[@liam-lh2nm]

@@stevenwilson9751 ah okay it is a nice design bet fully faired it looked even better

[@stevenwilson9751]

Take a look mate, all pics from start to finish here app.photobucket.com/u/fishbarf/a/b0f6ba09-a57a-4f22-8c09-e991552ce877

[@henriv8570]

Hi there, what fairings did you end up using?

[@stevenwilson9751]

HI Henri, I used an RS 250 fairing

[@henriv8570]

Steven Wilson damn that looks so neat, do you have some pics you can send me? It almost looks like a ZX6 or ZX10 fairing. Well done on a great job!

[@stevenwilson9751]

Henri van der Merwe - thanks. See full album of pics from start to finish here - flic.kr/s/aHsm7PMGQD

[@jameiholroyd512]

Wat rear faring is that bud

[@stevenwilson9751]

Jamei Holroyd - it's an RS250 race seat I imported from Germany

[@epicsteamoverclock4175]

What is the 350cc off of?????

[@stevenwilson9751]

Hi, It's an RD350LC motor

[@maxkatana.8555]

What alloy did u use for the frame swingarm, rear shock, and engine mountings? You plugged adaptars in the swingarm to fitt the aprilia swingarm bolt. Where are this adaptars from? would be cool if you can help me.

[@stevenwilson9751]

Hi, the aluminium was 6061 grade. All spacers, plugs, adapters etc were hand made on my milling machine and lathe. The Zx6r rear shock was used because its fully adjustable, damped well for my style and I had one in my parts bin with a selection of race springs already to hand 😀

[@maxkatana.8555]

ok cool thank you last question did u end up using the ymaha swingarm axle or the aprilia?

[@maxkatana.8555]

ive a few questions it would be soo cool if you could help me. What swingarm axle do u use yamaha or aprilia? Was it riding good with the rs125 front fork/brake?

[@Vayz1]

Is it an rd350 engine

[@Tiwey]

rd350 fits in everything

[@saifcajee3306]

Engine details please?

[@stevenwilson9751]

it's an RD350LC with programmable ignition, 36mm flatslides, YPVS reed blocks with carbon reeds, lightened flywheel and modest porting.

[@saifcajee3306]

Steven Wilson thanks for reply mate

[@saifcajee3306]

Steven Wilson been looking for a 2stroke engine for my rs4 125..but i cant seem to get hold on this rd350...

[@lentilsouper]

I want.

[@kritromulus6851]

BikerForce..WOW W W HOW W W !,..THE MISSILE !?!,..

[@christophermyers4422]

sweet - fine job - would any one know- engine conversiorn aprilla sx rx 50cc rilla swap for nsr 125cc any body know