So given the bike is my main transport now and with a cold winter promised I figured perhaps prepare a little bit.Continue reading Winter tyres for the YZF-R125
Not really sure where to start to I guess start at the beginning and will work up to date from there…
I’ve been into messing with cars for years, mostly mk2 golfs but only got into bikes sorta by accident when I fell in love with stretched scooters (they’re ridiculous, I know). Somehow along the way I got the idea that I’d quite like to do the blood bikers thing and realised that i’d need a geared bike to get a proper license in order to do so… So after some online research, concluded R125 was the way to go. A friend happened to have one sat in his garage (see pic above, as I found her he’d since got a blade and was bored with the 125) so I did my CBT and here we are…Continue reading White ’08 Yamaha YZF R125
Here are a few pics from recent progress…
I’ve been working on trying to get it as “together” as possible, all trim, bodywork and stuff, before putting the floor bars on to get the best idea of how to do them. I think now I know what I’m supposed to be doing and now just have to actually get them in. Hopefully I’ll get into that this week, weather permitting.
The back rides up when there’s no weight on it which makes it look a little odd, but when you’re on it, it all lays flat and lines up right.
The last pic is with me sat on it as you can hopefully see then both the rear mudguard and the exhaust come into alignment. It’s very, very long for a scooter but looks to be headed the sort of direction I was hoping (japanese “big scooter” style).
[BTW: I STILL HAVE ALL THE BITS TO TURBO A POLO SO IF SOMEONE BRINGS ME A POLO IT WOULDNT TAKE MUCH ENCOURAGEMENT TO GET ME TO DO IT..BUT i DONT HAVE THAT CAR ANYMORE]
Unfortunately this ran into running problems and I decided to sell it and got my other car back on the road instead – which is already turbo and much faster 😉 ah well. priorities init.
For anyone looking into doing this I think what I had planned for the polo *was* totally feasible.
Since you can’t adjust the fuelling in the ecu on the 6N polo, my plan was to add a smallish turbo (I had a pair from an Audi RS4 (2.7L divided by 2 = 1.35..which ought to be about right for the polo).
Then have a secondary injector which is activated by a boost switch and dumps a load of fuel into the inlet tract. When no boost it runs on the stock fuelling, and as soon as there’s boost it douses it. It wouldn’t be sophisticated but it hopefully wouldn’t melt.
Downsides are that this will be pretty imprecise – like you won’t get ideal fuel distribution per cylinder so changes are some will run hotter than others, which may lead to meltage if pushed too hard. I guess it would be similar to adding a wet nitrous system, with similar issues.
I was only looking for around 5psi of boost which I reckon the stock motor could probably take all day long. My hope was the anti-knock sensor would adjust the timing automatically if it got a bit too excitable.
Any more than 5psi and you’d probably want to be looking into better fuelling control, reducing the compression via thicker head gaskets (e.g. copper, which are available on ebay), and would perhaps need something a bit more sophisticated than the knock sensor to retard the timing.
Obviously the costs start to go up pretty steeply at that point hence sticking with 5psi….except it beat me to it and it started having starting problems we couldn’t fathom and I needed a working car for work so i cut my losses and got the audi back on the road. It’s something I may come back to in future though the syncro is my priority.
Ah well.. I’ve got a big box of turbo bits for sale if anyone needs them (2x RS4 turbos, some of the original manifold pipework to rob flanges from etc, boost sensor, boost gauge, injector etc.
…unless..maybe…the turbo might go on the syncro. hmm. Turbo might be a bit small for the KR motor but again, only needs to make 5psi-ish. At least with the syncro the injection is mechanical so can be adjusted, and the timing is probably simple enough to fiddle too, plus I have a couple of spare motors.
Also it would *massively* simplify the downpipe situation on the syncro which is a problem I will be facing anyway if I can’t get the current downpipe to seal properly.
hmm…let’s see what happens.
Now that the rear suspension is sorted I was able to figure out the positioning of the exhaust. Obviously with adding offset and the wider wheel the exhaust needed a little bit of “editing” to clear the wheel. Was a bit nervous about messing this up but it actually went ok.
So the air ride sorta worked but I wasn’t happy with the reliability, and that’s not something I’d want to fail at speed.It was holding up the rest of the project so I decided to go with a regular shock on the back for the time being and come back to the air later.
So tonight I finally got the first round of turbo bits for the polo. There’s a few bits still missing but the key players are there so I can start to figure out how it might actually go together.
If you want to tell me why this is a terrible idea then please use the comments box below.
In this video I’m testing the air suspension setup. Not sure quite what the final format of it will be – there’s still a fair bit of experimenting at this point.
Full build thread to date HERE
This is part 4 of my catchup videos showing progress on my fatty/stretched yamaha Neos project.
In this video I’m building the stretch frame which should give the scooter that stance I like so much.
This is part 3 of my catchup videos showing progress on my fatty/stretched yamaha Neos project.
In this video I’m going through the process of mounting the rim from an Austin Mini Classic with a scooter tyre stretched onto it, to the yamaha driveline.
I ended up trying two different approaches, I’ve left the mistakes in since perhaps it might help you or someone else figure out how to (or not to) do something similar.
The bike is a 2002 Yamaha Neos, 2 stroke, 50cc Minarelli engine in a stretched, “fatty” style. It’s a regular yamaha scooter with much of the plastics removed, 7×12″ rear rim from a mini-classic, it’s stretched by 18″ and lowered, on air-ride.
This bike is actually coming together now so I thought I’d post a bit of a catchup sequence. It’s ended up being several parts though covering the main challenges I’ve had with it so far.
Thanks for watching, next part to follow shortly, please LIKE and SUBSCRIBE to see more 🙂
Full build thread to date HERE