llindsey1965

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hey guys i just purchased a 1/4 scale airplane and it has a YD-A 56cc engine it appears to be fairly new , cannot find out any info on this engine , i did find a manual , but would like to know all i can about this engine , it runs great has a lot of power with good idle , just curious is it still in production or is it a dead horse

aussiesteve

Definitley NOT in production any longer.

The original engines under that brand name were made by me here in my shop. The US agent for them got permission from me to get them made in China by JC engines. If you got a good one, they were a good engine but there were many issues with those ones related to the factory making unauthorised changes and attempting to save costs. As a result production was stopped and will not be restarted unless someone would like to purchase the molds etc from me and do it under their own funding.

For the full sad history - here is a link.

[link]http://www.rcuniverse.com/forum/m_9541568/anchors_9541568/mpage_1/key_/anchor/tm.htm#9541568[/link]

llindsey1965

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Thanks it seems like a good engine , has hardly been ran any  has a looks like a fuel pump between the carb and engine  , starts easy smooth idle  , and lots of mid range power  swings a 22 10  menz no problem , how can i tell if it is yours or a chineese knock off

llindsey1965

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do you build any engines  now????

aussiesteve

Unless it has the serial number "010003" on the cylinder mounting flange of the crankcase under the exhaust port. It is not one of mine. I have tracked all of the others I sent there except for that one.

22/10, 23/8 and 24/8 are the preferred props for them. They were designed around larger diameter props and were never designed to run high RPMs - part of attempting to keep noise levels low. This made them unpopular as the majority of buyers can't see past "Spins XXX prop at YYY RPM" or "Only costs $0.01 to buy" when making a decision.

Run it on 40:1 Synthetic oil (Pick a decent brand that is readilay available to where you are - Stihl Ultra HP if you can get it).

To tune it
Take it to top RPM and Lean out the high needle until the revs drop, then open it up about 1/8 turn.
Set the throttle to about 2500 rpm then Lean the low needle until it stops pickling up speed. The richen the low as necessary to get a crisp transition.

Then go fly the heck out of it.

Nowadays the only engines I manufacture are "one off's" (Mostly Scale 4 strokes for scale projects) they are not cheap and not mass produced. I have my shop booked for just over the next year but the total number of engines is quite small.

I will NEVER get into mass production for this game again. There are already 3 companies that are VERY good at that (DA, BME, 3W), one other that is quite good (DLE) and a lot of cheap ones out there


When I buy an engine for general flying for my own use - well my sig line says it all

llindsey1965

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if that number is correct then i have one of your engines , wow it looks almost new and is on a 1/4 scale patty wagstaff and came to me from southern florida    010003 is on the engine under the exhaust on crankcase , i have been using master pro  NMMA TCW-3  do i need to change to synth????

llindsey1965

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iwill remove my cowl and get a pic for you 

llindsey1965

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also the manual has this information  YD-Models Pty Ltd   Tel (61) (8) 9296 1072    and   [email protected]   ydmodels.com.au
did not have a box  let me know  

AJsToyz

The oil your using is for a water cooled engine, you should be using an oil for air cooled engines.

Andy

llindsey1965

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thanks AJ  i will get some sthil  synthetic

aussiesteve

+1000000% on that

Some good oil choices are:
Penzzoil air cooled at 32:1 (or 30:1)
Redline "Racing" or "Kart" at 40:1
Stihl Ultra HP at 40:1
BelRay MC1 at 40:1

NEVER Lawnboy
NEVER Amsoil
NEVER Optilube
NEVER anything that is suggested to work at more than 50:1 (Such as 80:1 or 100:1 mixes).

My recommendation would be to go to the local saw shop and try for Stihl Ultra first. If that isn't locally available, go to the Local bike shop that specialises in dirt bikes and see which oil they sell for air cooled 2 strokes and use that (as long as it isn't on the "NEVER" list).

But seeing as it appears you have the "mystery engine". Put it into safe storage and wait until I die. Like the work of many artists, It may become quite valuable after that event. (Sorry - I can't quite predict when that will be yet, I am only in my mid fifties)

llindsey1965

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i hope you and i live a long long time  ,  flew this plane at half throttle and it has so much power , but i will take care of it  , the engine performs great  , at half throttle it will contuine to climb and at full throttle it is gone  straight up  , i will get some pics tomorrow for you