HornetMaX

Damn you 2GodBDGlory ! Now I will have to monitor that "MODs and Improvements" thread. I fear the same hell I went through for the big Porsche 911 GT3 RS. The solution by jfb9301 that you linked works perfectly (1 v N v 2 v 3 ^ 2 ^ N ^ 1) and is really trivial, just a bush/gear swap, no extra pieces. It's so perfect it should be an errata more than an improvement or mod.

I was so bothered by the wrong shifting order. Your solution is pure perfection ! Thanks !!

OK, I triple checked all this before proceeding with the other bags. I'm fairly confident my one now goes N ^ 2 ^ 1 ^ 3 v 1 v 2 v N ^ ... So it's the same order as Milan (pheew !) but setup so that neutral is all way down. Marginally better, but it still sucks. Fixing this to get a nicer thing (N ^ 1 ^ 2 ^ 3 or even better 1 ^ N ^ 2 ^ 3) is way above my pay-grade and my capabilities. Overall ratios and feeling (how hard it feels to pull the chain in the different gears) now make sense with respect to my understanding of how the gearbox works. I was thrown off by the fact the 16 red gear does not mesh into the 12 black gear ! Gonna call it a day and move to bag # 3. After having put everything back together :)

Thx Milan. In fact I wrote some wrong stuff above (now striked out). Still trying to think about it, I thought I understood how the whole gearbox works (visually inspecting it I tried to compute the ratios) but after manually checking the ratios (counting turns or feeling how hard is to move the engine pulling the chain) I'm no longer sure about that :) Would be nice to have something reasonable (e.g. N ^ 1 ^ 2 ^ 3) if perfection (1 ^ N ^ 2 ^ 3) cannot be achieved.

I had finished bags 1 & 2 and I noticed something: pulling the chain, no matter which gear I was in, the pistons were moving. Initially I thought I did something wrong, so I went back a lot of steps (a pain !) to re-check my gearbox. Turns out nothing was wrong: due to friction and the engine pistons being a very light load, pulling the chain was making the pistons move even in neutral. I confirmed applying some load (with my finger) on the gear that drives the crankshaft: in 3 of the gears pulling the chain definitely moved that gear, while in one (neutral) it didn't. But for me the neutral gear is not between two other gears, it's the top one : i.e. pushing the selector up as many times as possible. I can visually confirm that as the two 6100931 (Technic Driving Ring 3L) are not engaging any of their 2x 6000930 and 1x 6224999 (Gear 16 Tooth with Clutch on Both Sides, Gear 20 Tooth Double Bevel with Clutch on Both Sides). If I'm not wrong, for me the order of gears is N v 3 v 2 v 1 ^ ^ 2 ^ 3 ^ N v ... (where v means push selector down, ^ push selector up). It doesn't make more sense of what Milan has. I guess I messed up the relative phase between the 6227330 (Changeover Rotary Catch) and the beam that limits the rotation of the gear selector. I have now modified it to have the slightly more meaningful N ^ 1 ^ 2 ^ 3 v 2 v 1 v N ^ N ^ 2 ^ 1 ^ 3 v 1 v 2 v N ... still not like a real bike gearbox, but a bit more reasonable than having neutral between 3rd and 2nd :) But I'm a bit lost as that Milan seems to have a different order Ratios between crankshaft turns : chain pinion turns seems to be: 1:1 (1st gear), 12:16 (2nd), 12:20 (3rd). EDIT: some of the above was wrong, striked out.

Answering to myself: I went back (quite a pain) and gained access to the gearbox. There was nothing wrong, except that due to friction and the engine pistons being a very light load, pulling the chain was making the pistons move even in neutral. But I discovered something: for me the neutral gear is the top one, not between 2 other gears. No big deal.

Hi all, small question. I've just completed bags 1 and 2. The gearbox seems to work: I can move 3 up and then 3 down. But I have no neutral: I was expecting to have the pistons not moving when pulling the chain while in one of the 4 "gears". But for me, pistons always move when I pull the chain, no matter in which gear I'm in. Have I done something wrong ?