Actually I just have 6 research points for toka, Helen ki49 1a with 27 research points and mavis h6k2 with 8 research points and I am in 5 February 42. Repairing are many factories but rufe I have 5 factories repairing maebashi with 2 fact repairing 9 and 5 and another 3. What must I do to improve the rufe or what am I doing wrong. Should I stop or change the toka and the other two
IMO, you should have made all of your research choices before you started the game and made all your factory changes on the first 3-4 days of the war. Anything that you did not change to size 30 should be set not to repair. A rule of thumb is that every 3 days that you delay research repair is 2 days extra that you wait for the aircraft. Not exact, but close enough. By February 5, 1942, you have put your new models 40 days behind schedule.
A common piece of advice I see is that the game is a long one and you should not try to do it all at once. For the Japanese player, that is ****ty advice. The reality is that every day is vital to Japan. You don't get that long before the Allies can counter you and wasting days only hastens your defeat. A new aircraft, even a few days early, can make a difference to Japan. For the Allied player, a few days delay means a lot less because your material advantage only gets bigger as the game goes on. As Japan, you need to make your plan and execute it.
There's two steps where you incur a cost: when you Expand it (creates damaged devices), then when you Repair it. Everything you expand costs you 100 supply, 10 HI, and 10 manpower. Everything you Repair costs 1000 supply. The only cost you incur on day 1 is the cost to Expand. The cost to repair gets spread out, with most of the repair costs coming in the last few months before research starts. IMO, you are better off getting your factories so they can try to repair and then switch them off later if you decide to scale back. For example, if you become convinced that the war will end early and you will never get to field a model, stop repairs then. Yes, you wasted some supply, but the truth is that as long as you do not front load all your repairs, many of those late war models will not have repaired enough to make a huge difference.
Note: by "front load" I mean use r&d factories to research a lot of early-/mid-war aircraft. Remember that a 30 device r&d factory researching a late war model like the Frank (arrives 4/44) only has a small chance to repair each turn (1 in 28) - and if it does not repair, it consumes nothing. Your Rufe arrives in 4/42, so your chance of repairing a 30 device r&d factory is closer to 1 in 4 . You might repair 1 point of the factory in all of December for the Frank, but you will likely repair closer to 6 or 7 in the Rufe's. Put another way, because the Rufe arrives so much sooner, you'll spend 6-7000 supply in December instead of about 1000. If you research a ton of aircraft that arrive in 42 and early 43, you will burn through a ton of supply early on.
Anyway, with respect to your question, you should halt repair on any R&D factory that you do not intend to research / fly (at a minimum). Depending upon the choices you make, you probably want to convert many of them to R&D another aircraft and expand those to 30. Just keep in mind that repairing all of the Japanese R&D factories will cost you roughly 2 million supply - which is roughly 80 days of Japan's ENTIRE GROSS Daily Supply Production - and that does not include the expansions necessary for the engines. Since you need 2x engines for each 2E plane you are really talking closer to 3.5-4 million supply and as much as 400 days of gross supply production.
Finally, you really need to have a picture of how the pieces in the Japanese economy interrelate and look at some long term projections. If you are not using Tracker, you should be. You cannot make R&D choices in a vacuum. If you can't explain how the Japanese economy is modeled, then you aren't ready to muck with the economy on your own.
On other answer: Aircraft production does not consume supply - it consumes engines and HI. You will expend supply to move those aircraft from the pools into air groups, but that is a different issue.