The Dionysus Project (Aprilia ETX 125 Rotax 122)
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So...what's going on with this project? That's a good question, Frame is still rotting away in the garage, rust coming through the paint as we speak (very annoying). I think the frame needs to be acid dipped again and the bare metal looking at, I suspect there are holes in the frame which need welding.
Hhmm, thought I had some photos, but can't find them.
Brand new Koyo bearings and oil seals fitted. Crank cases are back together, in the middle is an Italkit Billet CNC'd rod
Stock ImageFastened together with Ti5 Cap head bolts to try and minimise all weight. If it hasn't been made clear already, the Polini 154 kit will be used mated with a flat slide VHST 28mm carb (I'm not going for all out power here, even if Polini quote 37 ponies in race trim) I actually plan on using this bike on the road and therefore want it to have some resemblance of reliability...for as far as a tuned barrel goes anyway.
Oh the topic of fasteners (purely so I don't have to write it all down again)
Rotax 122 Engine Fastners Quantity:
- M6 45mm X 7
- M6 30mm X 16
- M6 25mm X 7
- M6 20mm X 12
- M5 25mm X 10
- M5 15mm X 4
Lots going on at home at the moment and I simply don't have the funds to get any of the projects I'm working on shifting, so just chipping away at each as and when I get the dollar coming through.
I'll get some photos of the superb rebuilt crank/rod and engine when I'm next in the workshop.
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Okay, got some photos for ya!
Bolts are in...
To minimise weight, Grade 5 Titanium. This is everything I needed plus a few extras and it's not even a Kg! Crazy how much bolts weigh up to!
This was a picture of the rod I'm using.
Sweet jesus gawd that rod's expensive, it actually makes me cry a little. This isn't even a bike I particularly care a great deal about
But it's spent now so...on to the cylinder
The parts all together.
- Polini 154 Barrel/Head
- Italkit Pneumatic Valve
- ETX doesn't come with a powervalve system & I CBA to run electrics (even though I'll be using a Zeeltronic)
- VForce3 Reed Block
- Brand New Genuine Inlet Manifold
This is a collection of 2 years worth of parts...I've had a lot of this sat around gathering dust.
The inlet manifold is like the DTR, and therefore needs chopping to fit
I didn't fancy chopping a brand new old stock one, so chopped my old one instead...w/e
Actually, to tell you guys the truth, since we're all old pals, the VForce3 reed block came with a job lot of parts I bought a few years ago. I thought it was mad someone threw that in as well. It was missing the petals though, so £60s worth of petals. I was actually going to use this on my Spains No 1, but figured this would be put to better use here as I don't actually plan on using the Spains No 1, and I want that bike to be as OEM as possible, whilst spending as little as possible.
Anyway, that's it for this project for the moment. I am absolutely skint at the moment and this literally took years of collecting to assemble (I had the VForce3/Polini from before I even owned the bike).
Next is, I want/need new genuine clutch. New balancer shafts and oilpump gears. I forgot to get the clutch cover vapor blasted, so that needs sending off. I'm also thinking TYGA sprocket cover... dunno yet.
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@MadGyver It's been sand blasted and acid dipped. What ak believe is happening is that they are not baking the frame properly and eliminating all the acid. As such it's just eating the paint and coming through the frame.
So annoying as I'd have this back together by now if it wasn't for that.
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@Calum When doing work on the frame after stripping the paint,I was washing the frame with acid for 2 hours until no rust was found,then did a good wash with a chemical base diluted water to eliminate the acid.
A good soap water bath and drying up with a butane based torch. Then did the protection steps.
4 years in the weather (no garage) no rust on frame.
Maybe you should DIY at home to know what is done on the frame. -
You can get them zinc dipped quite cheap, I think.
I remember reading about a frame that was blasted, acid dipped, then zinced and finally powder coated and (IIRC) it was about twice what just blasting and powder coating would be…It’s what I’ll do if/when I get round to it!…
PS the coating looks really thin in places. It’s only if water and oxygen gets to the metal that it rusts. The only time I’ve seen it like that was when the blasting medium wasn’t cleaned away properly and contaminated the paint…
PS I love what Audi used to do to their cars before anyone else, every panel and chassis galvanised and the bottom sprayed with an RTV silicon type substance to prevent chipping. I had an 80’s Audi 90 that had literally one spot of rust on the rear window pillar!…
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Mate I’d be so so fucking pissed if that was me…
Have you got a refund or been offered by them to have it done again?
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@Stevie-Wonder Yeah it's annoying for sure, but I just won't use them again. It's been back once already....
I'll take it to Blackpole Coating in Worcester, it's a bit of a trek but they'll at least do a decent job.
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Slowly reassembling the engine, money is super tight at the moment so it's taking its time.
OEM genuine balancer shafts are damn expensive now at £140ish a pair. Theae pattern ones are made by a reputable company and feel good quality. OEM genuine oil pump cog though, even though the original was probably fine. A set of uprated springs to take the additional power, clutch plates are out of stock. PJME say OEM are the best...new circlips all round.
Engine timed up to spec
Circlips renewed
Cylinder bolted on and fastened together.
Squish is way out on these engines, by default they are something like 1.4mms, here I measured 1.1mm and the guidance is aim between 0.7-1.0 but allegedly this requires machining to the engine to do this so...
Not going for all out power here so should be good enough, got to be better than stock power that's for sure.
Need to get the clutch cover vapor blasted, cleaned up. Then new clutch plates and then the engine can go on the shelf waiting for the bike respray...again.
But I have a spare Mito engine that I really want to get fixed before I do any more to the ETX.
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Annoyingly genuine clutches always seem to be out of stock. Actually not much meat left on the original one (it's done well to be fair). PJME recommend genuine as the best, but if they can't get them in stock...then needs must.
Ferodo is a good brand though and I'm not expecting RS 125 power here and it will never be dailied in my ownership so should be fine...
Ordered one of these for my RS125 years back (Billet Clutch Pressure Plate). I bought this a long time ago too and it's just been sat gathering dust. Not sure if it actually makes any difference, but it's a nice little item.
Either way it's got to shave off some precious weight from a reciprocating mass, alongside the titanium bolts. Although the stiffer clutch springs probably add some weight back on....you win some you lose some.
Hhmm, I honestly don't know what a previous owner done to this bike, but they just covered everything THICK with paint. After much scrubbing and cleaning I...abandoned that idea and bought new/used parts instead.
Brand new TYGA sprocket cover and generator cover. I bought a used generator cover off of eBay for an RS125. sprayed it black and affixed the carbon fibre generator cover on. The original engine is black, and I want to keep the bike close to its original colour scheme/trim where possible, but it'll never be original.
Can't find what I done with the kickshaft seal or gear linkage seal, so will need to get those on order.
The oil sight glass had melted, so I'll need a new one of those and will grab some new oil fill and clutch adjustment cover as well as a oil drain bung.
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Now that the engine is done, I suppose it's best I return back to the frame. I've contacted another local powdercoaters who are able to do the work for me and it'll be dropped off tomorrow. Fingers crossed they do a pucker job this time.
This is it as of yesterday, it hasn't been touched since I got it back from the coaters.
My garage is also very warm as it houses the gas boiler which means it's toasty in there all year round.
Meanwhile I saw this cheeky swinging arm over in Italy for a measily £50...
Now despite already buying and refurbishing an aluminium swinging arm, at no small expense I might add, I do prefer the styling of this arm. I wanted this arm originally, as this is what you'll find on the MX, however the one on the MX uses a special kind of dog bone which I could not source for love nor money. However this one came fitted with the same dog bones that you'd find on the RX/SX/ETX and claims it came off an RX. So I snagged it.
Dimensions wise it all checks out the same as the one I originally bought, so there should be no issues with spacers, clearances or alignment.
It's a lovely bit of kit and a few minutes on a basic polisher shows how good it can come out.
I'll be sending it away for vapor blasting and new bearings have been ordered.
Question is? To polish or not to polish?
I'm looking forward to getting this bike reassembled and back on the road.
