Folks.
Is this a Quadra 75?
I have the instruction booklet that came w/ it but the booklet does not show a Quadra 75 in it.
I think it was one of the first production runs of Q75's that rolled out about 8 years ago or so.
The serial # is 75109.
It says "made in Canada" scrolled on the side by the serial #.
Spark plug says Bosch R10 371.

One question is what is the black pull switch thing on the head side of the engine? I can pull that out or push it back.
I found the screws labeled H and L (high and low mixture settings?) on the side of the carb.

This is in a 95"? Carden "El Bandito" (don't think they made many of these kits) that I pulled out of mothball and will start up this week.
I have a 24x10 prop for it that I pulled to get the cowl off.

Could be a 65 but I have (2) 75s here that look exactly like your pictures. Mine are s/n 7677 and 7787. I beleive the first two numbers are the year of production. The black thing you refer to is a compression release valve. Push in to make prop flipping easier. I find that my engines start easily with the valve closed or open. As soon as the engine fires, the valve closes itself. These are excellent engines with good power. They do shake a bit though compared to more modern engines of similar size. They might be a bit heavy also. I don't think you could wear one out though. You most commonly find these on warbirds these days. Excellent for something with a big round cowl and short nose moment. I enjoy flying these quite a bit and your 24x10 prop is pretty much a standard size on this engine.

OK, I got it back in '07 or '08 I think (don't remember).
Can you tell me how many oz. of oil to put in a gallon of gas for this engine?
Do you or anyone know the default settings for the H and L mixture settings from fully closed?
Also, does anyone have a link to some good instructions on a method of adjusting the mixture settings?
I plan to to start her up this weekend in the back yard.

David

My Quadra 75 engines were ran for years with a 32:1 mix but for the last two seasons I have ran them at 50:1. Use a good 2 stroke oil such as Pennzoil air cooled. There are dozens of threads here on RCU about oil so I won't go into that here. Do a search and you will find hours (maybe days) of reading on the subject. 32:1 is 4 oz. of oil per gallon, 50:1 is 2.56 oz. per gallon. Anything at or between those amounts should be fine for your engine.

As for needle settings, again do a search here on RCU for tuning proceedures .... many to choose from. Sorry, not enough time here at work to write a complete description at this time. Your engine will start and run with both needles set between 1 1/2 to 2 turns open .... adjust from there as needed. Does your engine have a spring starter? If so, that will make starting much easier but these can be started OK with a brisk flip of the prop through a wide arc to get a good spark from the mag. How long has it been since your engine was last run? It may be due for a carb kit or at minimum an inspection of the pump diaphram and filter screen.

Is this your first gasser? If so, you have a good one but respect it and be careful around that big prop.

Thx Truckracer,
I had a G38 for 1 season before this on a clipped wing spacewalker (I purchased it 2nd hand). I later sold that to fund this venture.
This plane w/ the Quadra flew about 5-8 flights back in 1999 or 2000. I put it way after my first son was born. So it's not even broken in I think.
Yea, it has a spring start on it. I have a thick rubber glove for my right hand when starting it up to reduce (but not eliminate) an injury if I make a bonehead move on the startup.

I'll search around on the forum for the mixture setting methods.

Good track record. The racing version first appeared at the Madera races in 94, and took gold and silver with lap speeds of 113 to 116 mph and top radar speed of 135 mph. in Cosmic Wind.

Hi Truckracer,
I have a Quadra 75 with a spring starter.
Where do you buy a new spring for the spring starter???
Thanx, Doug

I've never needed a replacement spring but try these sites .....

http://www.quadraaerrow.com/quadraaerrow/

http://bennettbuilt.com/page1.htm