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  1. N

    Charging system regulator needed for a Rotax 503 2 stroke.

    Hi all.....whats a good charging system regulator for a Ducati ignition Rotax 503.....years ago a pal fitted a Key West Reg to his 503..worked well. What the best way to go these days.
  2. N

    Charging system regulator for a ducti ignition Rotax 503

    Hi all.....what a good charging system regulator for a Ducti ignition rotax 503.....years ago a pal fitted a Key West Reg to his 503..worked well. What the best way to go these days.
  3. N

    Is there a piston available bigger than +60 for the 503.

    Hi guys...my 503 dcdi is already on +60 pistons. It needs a rebore...is there a bigger piston than +60 available...maybe aftermarket. Nick.
  4. N

    Am I better parting my 503 dcdi aircraft or hanging on for a sale.

    Hi guys I have British reg ultralight aircraft its getting on in years...been up for sale for a few month with no takers...I have priced around £300 more than the competition mainly due to its 2011 503 DCDI fitted with an M4 elec starter that I bought brand new from my Rotax dealer in the UK...
  5. N

    SC 503 bogging going on power in the cruise.

    Hi guys...a buddy of mine is having probs with his scsi 503 fitted to a trike.. In flight in the cruise at say 5000rpm...sometimes when he goes to full power to climb he finds the engine starts bogging with the EGT on the rear cylinder PTO end dropping quite a bit...EGT on the mag end staying...
  6. N

    Descending with a 2 stroke powered trike.

    Rotax from what I remember dont give any advice on the best way to manage your Rotax 2 stroke during descent. My trike is powered by a 503 fan cooled DCDI...normal cruise RPM is 5000rpm... When I am ready to descend into the pattern or circuit as we call in in the UK....I snap the throttle...
  7. N

    Ethanol and older 2 stroke pre ethanol.

    I operate an older 2 stroke from well before the ethanol days...the only tuning info I have are from that period...carb and old points ignition. What consideration would I need to take into account to use this engine with modern gar and 5% ethanol. ie would the timing need a different setting...
  8. N

    Best tool or method to fit pegged 2 stroke pistons to a rotax bore.

    Is there a too suitable tool for fitting pegged pistons and rings such as those fitted to Rotax 2 strokes to the cylinders or is it best done by hand.
  9. N

    Sorry non aircraft question re a 2 stroke.

    Hi all please forgive me but I know there are some very knowledgeable guys on here and I would like your views. I have an old British 1960s motor cycle that I am about to stat using...a weekend play thing...its a 175cc single cylinder. The hand book says run it at 25/1...dont forget this...
  10. N

    Sorry its not an a/c engine question.

    Hi guys please forgive me but I cant get an answer to this question and I know you guys are very knowledgeable on the subject of 2 stroke engines. Ok I have just bought my first ever motor cycle...its a British BSA Bantam 1968 fitted with a BSA own make of 175cc air cooled single cylinder...
  11. N

    I wonder how this 2 stroke works.

    /www.youtube.com/watch?v=fZC5nUM1J7w Could it be like this in theory. /www.youtube.com/watch?v=s6GW0-iwMSM&feature=watch_response Wish I could speak Russian.
  12. N

    TV doc...re-building a Gyrocopter.

    Some of you guys may find this British TV prog interesting...I did, Its a good few years old. Gyrocopter 2002 (02) - YouTube Nick.
  13. N

    The UK is switching to 8.33khz channel spacing VHF radios,...is the USA????

    Hi guys....I am an ultralight pilot/owner here in the UK where most of us guys use Icom hand-helds VHF radios, The only legal one we can use is the now quite old Icom A20...we have a very strict CAA who will only allow type approved VHF radios...and the A20 is the only approved...
  14. N

    Rotax 503 dc rpm surging with no input from me.

    Hi guys I wonder if anybody could give me any ideas as to what could be wrong with my 503 dcdi, Bought it new about 18 months ago...one of the last available...when I fitted it to my a/c I was not happy with the factory set carb needle position as the EGTs on both pots could be just over the...
  15. N

    Max RPM setting for the 503.

    Hi all and seasons greetings, I'm not a home builder but enjoy this forum as there are lots of very interesting discussions with very knowledgeable owners, I have a UK registered trike with a DCDI 503 fan cooled with a 3 blade Warp Drive pusher...bought the 503 motor for it new last...
  16. N

    How long do you run your air cooled Rotax before going to take off power.

    How long do you run your air cooled Rotax after start-up before going to take off power. I normally give my 503 10 mins...I would be interested in what other operators do with there's. Nick.
  17. N

    Can you tell me what your 503 CHT normaly runs at.

    Hi guys...trying to get a picture of the normal range of CHTs that 503s run at as opposed to the Rotax book figure, Mine is a fan cooled pusher on a trike and always runs cooler than the Rotax book fig...mine running at (145c/293f)....rather than the book normal running temps figs of...
  18. N

    Info req... on the German Sauer 85hp aero engine.

    My mate is looking at buying a kit plane here in the UK...and is interested in one fitted with the VW based Sauer 85hp engine....I had not heard of this engine till a few days ago, Can anybody tell me anything about it. Nick.
  19. N

    How would you look after you 503 in the winter if you where me.

    Hi guys...I try to use my dcdi 503 powered trike all year round...but due weather it can be out of action for 2 months a a time, I don't winter rise it but as I keep it at home on its trailer in my Garage...I run the motor once a month for 10mins to keep things running free and hopefully help...
  20. N

    Any alternative to owning you own lathe.

    I do wish I owned a lathe...I wonder for simple diy jobs involving aluminium...is the any alternative to the use of a lathe with any other type equipment. Nick.
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