Hey, just wanted to say I appreciated you making this. I wanted to brush up since I hadn't done this in a while, but I learned a few things while listening to someone speak The King's English. The multimeter method of determining the firing degree was absolute precision. I couldn't believe how accurate it was. I need to get the spark plug degree tool, I used a ruler ribbon. It works but it's a lot of extra work.
Thanks it's very much appreciated. I think I had my flexible ruler free with something I bought but I can't remember what!? It's on glossy paper so has lasted longer than my printed ones. The multimeter test seems to work well with the 12v ignition system but on my 6v the difference in resistance is very small.
So far its stopping the blow back through the carb due to the skimmed high compression head which is what I wanted. Adding a windowed piston should then give a bit more performance. Only problem is an A35 piston won't work as the window won't line up with an A3 intake port so I've got to make one.
@@Themoporium can you estimate how much you gained with reed valve without the window in piston? Very interesting idea, I have A3S myself. Check my YT channel.
@@VladicD It's hard to say at the moment as my A3m has wider than stock tyres and a 24t rear sprocket plus a fairing and top box so it's heavier and a little slower than stock. I was able to get 36mph on the flat despite the weight and lower gearing. This is about the same as a stock bike with a 60 kg rider. I weigh 95kg so that's not bad but I'm hoping for at least 40mph with the piston modified.
Because all the ones I've ever come across are 360mm when measured. There are slight design variations between the Bosch and Iskra versions but I've never come across one that's 365 unless it's off an A55 or AT50 which this video doesn't cover. The 2 methods I've shown provide tdc marks are always within a degree of each other. This is because a 2 stroke crankshaft only rotates 360 degrees no matter how you time it. Just to put this into perspective, with a 365mm flywheel your degrees equate to 1.01mm instead of 1.00mm and this isn't going to make any noticeable difference in your timing. Measuring this 0.01mm difference on a printed ruler would also be very difficult.
Hey, just wanted to say I appreciated you making this. I wanted to brush up since I hadn't done this in a while, but I learned a few things while listening to someone speak The King's English. The multimeter method of determining the firing degree was absolute precision. I couldn't believe how accurate it was. I need to get the spark plug degree tool, I used a ruler ribbon. It works but it's a lot of extra work.
Thanks it's very much appreciated. I think I had my flexible ruler free with something I bought but I can't remember what!? It's on glossy paper so has lasted longer than my printed ones. The multimeter test seems to work well with the 12v ignition system but on my 6v the difference in resistance is very small.
What is this? A3 cilinder with reeds? :O
Yes. It's a prototype I've been working on. It's currently fitted to my A3m but I've got to make a window'd piston for it.
@@Themoporium nice, how it is working out?
So far its stopping the blow back through the carb due to the skimmed high compression head which is what I wanted. Adding a windowed piston should then give a bit more performance. Only problem is an A35 piston won't work as the window won't line up with an A3 intake port so I've got to make one.
@@Themoporium can you estimate how much you gained with reed valve without the window in piston? Very interesting idea, I have A3S myself. Check my YT channel.
@@VladicD It's hard to say at the moment as my A3m has wider than stock tyres and a 24t rear sprocket plus a fairing and top box so it's heavier and a little slower than stock. I was able to get 36mph on the flat despite the weight and lower gearing. This is about the same as a stock bike with a 60 kg rider. I weigh 95kg so that's not bad but I'm hoping for at least 40mph with the piston modified.
Yeah maybe you should take a check that the flywheel is not 360 mm it's actually 365 so I don't know why you would do that without checking that first
Because all the ones I've ever come across are 360mm when measured. There are slight design variations between the Bosch and Iskra versions but I've never come across one that's 365 unless it's off an A55 or AT50 which this video doesn't cover. The 2 methods I've shown provide tdc marks are always within a degree of each other. This is because a 2 stroke crankshaft only rotates 360 degrees no matter how you time it. Just to put this into perspective, with a 365mm flywheel your degrees equate to 1.01mm instead of 1.00mm and this isn't going to make any noticeable difference in your timing. Measuring this 0.01mm difference on a printed ruler would also be very difficult.