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arthurmoto1 last won the day on May 26

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  1. https://www.youtube.com/watch?v=mW5zVN4G8mE
  2. Hi everybody! So have good news, it was first fly yesterday. Everything is OK. The trouble with carb was solved with additional fuel pump. Engine is powerful but needs some changes in transmission. So wait for video! Cheers!
  3. First fly short video https://www.youtube.com/watch?v=7S07EzjMmos
  4. Sorry we have some delay because of paratrike building. Fortunately the trike has had the first sky time yesterday! Wait for video and for news soon.
  5. Good news! It flyes but engine is a real beast! I think we have to make something to switch off one cylinder in the fly because it is too powerful. Wait for video. It is enough to have the engine just idling to move but 1/2 throttle seems to make possible to turn trike over!
  6. Thanks a lot! The same idea I was talking about.
  7. OK! Yesterday I was trying to find the solution of the carb issues and have found that it has very simple design. Such carburetors like Walbro are intended for use with not modified engines that have RPMs not higher than 6000 preferable less. They have only two metering systems, one for low RPMs and another for high. But this statement is not correct. It means one for lower and another for higher RPMs. So in reality you can adjust this carb on the middle range 4000-4500 RPMs but it will be lean on 7000 RPMs. Or you can tune it on 7000 RPMs but it will be rich on 4000 RPMs. You know the common motorcycle float type carburetor has needle for mid range and main jet for top range and in many cases accelerator pump. Google says the only solution is to use additional low pressure pump but I don't think so. So solution is to add one more jet for high RPM range.
  8. And there is a problem with Walbro carburetor at 4000 rpms. It is so rich that the mixture explodes just inside the chamber! Under 3500 and higher 5000 rpms it's OK.
  9. We were trying to use our old style exhaust but it is not suitable for such wide exhaust port timing this cylinder has. And you can see 250 cc motocross chamber for comparision.
  10. Hi everybody! So good news! I was trying to check the dimensions of chamber and the decision was that it was too short. We are trying the engine to be the best at 7000 rpms but that pipe was suitable for 12000 rpms. OK! Yesterday some parts were welded additionally and the result is suitable but not perfect. It is very strong on 7800 rpms but not lower.
  11. I was trying to add video but something went wrong. Once again. https://www.youtube.com/watch?v=7FdBpMeSFIs&t=31s
  12. Hi! Bad news! The first start of this engine was with the use of our old style exhaust and was absolutely great. But with new chamber we have lost approximately 1000 RPM of high range. So it is needless to say how difficult now is to make changes to produce new matrix and so on. But the aim of this project is to develop the best race engine ever and to win every championship and cup stages we can participate this year in our country so we have to make everything quickly. I have video but sorry the language is Russian. You can see the weight of the engine. I'm going to make English version after exhaust repair to show you. Cheers!
  13. The next step is to add the silencer.
  14. So you need matrix and 100000 kg oil pump to make hydroforming pipe. We take two sheets of 0.5 mm steel and weld them carefully together then pump them with oil inside the matrix. This is the photo of the first attempts.
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