Aprilia RS125 Standard Fairing

Two Stroke on a budget – Aprilia RS125 (Part 9)

Two stroke on a budget Part 9 – the Home Straight

Had to do a bit more bodywork from where some clumsy sod had dropped it – only minor stuff but it lifts the overall end product significantly. I had to do the y panel that fits under the seat – I used the same method as I used on the fairing – cellulose knifing filler rubbed down, primed and painted. I normally use Halfords cellulose paints for such jobs but as some git in China infected us all because he simply had to know what a raw bat tasted like supplies have become hard to come by. So I ordered some stuff off ebay, it seemed like a reasonable price. When I got it I realised it was acrylic and supposedly far less toxic than it’s older cousin. It seems to go on quite well – you have to put on quite a thick coat and it seems to take longer to dry – probably as a result of it being thicker and the solvent maybe needs a higher temperature to evaporate. Anyway the finish is ok but I don’t think it’s as hard as cellulose. If it proves to be a problem I will redo it. Aprilia Rs125 scuffed fairing

The new lock set arrived – ignition, seat lock and petrol cap complete with 2 keys – not bad for £45 brand new delivered. The quality looks good, fitting was straightforward the only minor issue being the photo showed the short cable that goes from the seat lock to the latch mechanism but mine came without. I had to go diving in the waste bin to find my old one and retrieve the cable from it. Wasn’t a big deal though as it was in pretty good nick. Apilia RS125 seat lock

I just wish I could remember which safe place I stashed the allen headed bolts for the fuel cap in. Oh well they were not in the best condition so some new stainless ones have been ordered. Only £3 for a dozen so it’s no big deal.

I was going to start it up today but I noticed what I thought was air bubbles in the oil feed pipe – the one from the tank to the pump. Weird as I had bled it just the other day. I decided to bleed it again so I didn’t forget and was very surprised to see it wasn’t air it was water. Now it doesn’t take a genius to know that water does a really shitty job of lubricating an engine and is in actual fact a great way of destroying one. I think what has happened is that where the bike has been sitting idle for 10 or 11 years water has got in the tank. As the air heats and cools so the pressure in the tank changes and air with moisture suspended in it gets sucked in to the tank. It then condenses and the water sinks to the bottom of the tank. I have now drained it off – I’m really glad I spotted it or it could have been disastrous. It is one of the reasons I don’t trust pumped oil systems and feel a lot better mixing the stuff myself.

Aprilia RS125 Top YokeWith that sorted I went back to bodywork – I looked at various options for sorting out the complex graphics and every one of them was going to be seriously expensive and not in keeping with a budget build. In the end I went for option f – hiding the damage with stickers. As luck would have it our good buddies at Wemoto had sent some freeby stickers, one of which was perfect for hiding the damaged part of the Nastro Azzura decal, a Michelin one hid the damage around the firing locator peg. I think it looks alright. I used a couple of Motul decals to hide some very minor damage on the y piece on the left of the bike, I copied it on the right hand side just so it matched. Total cost was sod all but the difference was big.

I had ordered a screen from ebay – new ones cost an obscene amount of money. The one that came was nowhere near perfect but at only £15 delivered it was a bargain. I am looking for some spray or something to put a dark finish on the inside of it, I think it will look pretty decent then.

Aprilia RS125 Petrol CapI decided to fire her up – purely for scientific reasons. Well actually I just wanted too smell the two stroke and hear the crisp little Rotax 122 single do it’s business. What it actually did was to piss itself, pouring neat petrol all over the floor. Some minute piece of detritus had found it’s way in to the carb and the float needle wasn’t seating so the tank, airbox and carb had to come off so I could sort it. I guess you have to expect this sort of thing when recommissioning a bike – I have installed an in line filter in the hope that stops it happening again – I don’t think the filter in the carb fuel inlet is fine enough.

Anyways, nearly at the end now, the next article will be the final one, I still need to replace the tyres but with the lockdown still in place I don’t think that will happen any time soon. I also need to make a decision about what to do with the finished bike. Selling it seems a bit boring, maybe a raffle? Maybe I will keep it and tune the arse off it. I’ll decide soon, see you next time.

Article provided by David Powell of Boston Bike Bits.

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