Howdy all,
I’m sure there is a thread somewhere, but I have found answers are fastest when done this way. I have a Used Quadra that looks like brand new, and was taken care of very well... Few things I need help with as I am in "new waters" with gas engines...

1.) The engine has a spring starter, question, do I need to be worried about the engine reaching the point of ignition and firing while turning the prop CW to wind up the spring starter?
2.) There are 2 Nipples, one on the carb, obviously the fuel from tank nipple , and one on the crankcase. I know gas engines don't use the muffler for tank pressure, is the one from the crankcase to pressurize the tank?
3.) I have no manual, therefore I have no clue on mixture ratio....I’ve been told 30/1, but need some educated advice. Also would like some suggestions on what brand of oil to use and octane of fuel....From others experience...
4.) Prop size, I have a JZ Zinger 20x8 and a 18x8, which is the better choice or is there a better size?[sm=confused.gif]
5.) There seems to be some sort of grounding strap on the case....is it indeed a grounding strap, unsure of where to hook it as the bolts for the engine mount are WAAAAY bigger than the hole in the grounding strap [:'(] .

Any other suggestions would be great....engine will be on a GP Patty Extra 300 25%, been told that this engine should fly her scale with no 3D or IMAC ability, EXACTLY what I'm looking for...I’ve been told like 500 different things as far as engine choice... Just want to fly her nice and easy until I can afford a better engine....Please no, “put a 100cc engine on your Patty like me," I get that it could use a bit more power, but as long as it will fly with a LITTLE extra power I’m ok with it for now..Thanks in advance for all the help!

Don't back it past two compressions with the spring or the spring will slip down through itself and there will be a lot of trouble

18-8 is the prop. The 20-8 is too big

32:1 Pennzoil Two Stroke Air Cooled get it at Advance Auto Parts

The grounding strap is probably the ignition kill wire if it goes to the coil. If it is shorted to the crankcase, it will stop the ignition

The fitting on the crankcase was probably to pressurize a smoke oil tank? Plug it!

The manual is below

get parts here
http://www.bennettbuilt.com/

Don't back it past two compressions with the spring or the spring will slip down through itself and there will be a lot of trouble

18-8 is the prop. The 20-8 is too big

32:1 Pennzoil Two Stroke Air Cooled

CasterTroy,

Align the prop so that the split between the two magnets is at 90 deg to the line of the prop. This is correct for spring starting the Quadra. My manual says back up the prop 3/4 revolution and release (with hand clear obviously). I usually back up close to but not quite a full turn. You do not have to worry about a spark with magneto ignition while backing the prop. It is dependent on velocity that is just not there. That is why you should never use a spring starter with electronic ignition. Don't need it anyway.

The only reason I can think there is a pressure nipple on the engine case is to run a pulse pump for a smoke tank. It is not needed otherwise. Plug it off.

Have fun!

Bedford

If that is the kill wire... Can I hook it to a switch and run it back to the case somewhere and mount the switch somewhere as a shutoff switch??

Yes

Unknown crankcase nipple and an extra carb nipple, could it be an external pulse for the carb pump ?

If the carb had a external pump impulse line, there would be a fuel inlet nipple and a nipple for the impulse line.

32/1 fuel and oil ratio...how many ounces is that per gallon... 4 ounces per gallon for oil right?[sm=confused.gif]

that is correct

The extra nipple on the crankcase is to run the B&B smoke pump. The 18X8 should work well. 50.1 will work fine just as good, with no smoke and no clean-up.


Dale

Thanks for all the help, but a few things...one, the nipple in question...has to be hooked up, or the engine will not draw fuel...I tried and tried to get her to pull fuel...wouldn't do it untill I hooked up the other nipple and then used a syringe to shoot a tiny bit into the carb. Also, I don't see how the 35cc isn't enough. She was about to break the horz stablizer feltlike it was going to rip off when I was throttling her up. The engine seems to be running a little hot, should I increase the oil mixture? Also, I want to hook up an engine kill switch...I have a jig with a stnrd servo and I was going to link it to a switch and use a channel such as "gear" to actuate the kill switch, any ideas or comments or experience on this idea?....it seems to have waaaaay more then enough power to fly non-3D or IMAC, people gave me a feeling it would struggle in the air with the quadra...there is a connection in the magnito,is this the location where I need to run a lead from this to a switch and a lead from the wire that is attached to the crank from the other side of the switch?

Your switch idea sounds OK

Some pictures of these nipples you speak of would be worth a thousand words

Here are two pics, not the best quality but the camera is somewhere and all I have on hand this late is my Blackberry. The Blue arrow is pointing to the mystery nipple, the red arrow and circle is obviously the fuel inlet for the carb, which has a line on it.... The engine will not pull fuel without it attached to the vent line [&:]..... I actually had to squirt some fuel into the carb and use a syringe to get some fuel into the line so that it would start up and start pulling. The little elbow where the carb line nipple is was really blocked [:'(], I had to attach a small piece of fuel line and use a syringe to push fuel through the elbow(see diagram)to clear the blockage... I really had to push hard to clear the blockage, I may need to clean it out more, any tips???[&:] maybe take it off and clean it, it works fine now and the engine isnt starving for fuel, and there is a really good new filter on the fuel line.... works good now

You are going to need to plug the "Blue" circled nipple or the engine will not run well. Use a piece of Tygon and a plug in the Tygon. You can get Tygon fuel line at Glenn's in Shelby,

You need to have someone show you about about how all this works? This is from your description of the carburetor drawing fuel? About the pump side of the carb. The regulator side of the carb. Why you couldn't push fuel throught the carb. About the filter inside the carb.

You need to take the engine to someone who knows gas engines, chain saws, weed whackers, to have them explain how the Walbro type carburetor works and how important the engines crankcase being air tight is.

I live just north of your town if you want to come by my house I can show you how everything works and what is important and what is not? SENDMEAPM

Thanks for all the help, I didn't literallt mean that the carb was drawing fuel....more acurately I guess I should have said the fuel wasn't being drawn into the engine/ carb....I know it uses a diaphram....all the real specifics I don't know...I did know that yo needed to have that plugged I have extra tygon...heck I would like to get together just to REALLY know how these work in detail..I do know the basics and could survive on that but you seem to have a broad sapn of knowledge on these...I will send you a PM later on with my contact info!

OK so the engine was running fine.... got the plane all "buttoned up" witht the cowel on and now she wont run.... I did notice one of the screws that hold the carb on is missing...I would assume that this is the problem, unsure if it was missing before. Will go to the hardware shop and get another screw.... but the engine jsut doesnt seem to draw fuel untill it is completely running....Unsure as to WTH is up with that.....was thinking about replacing all the gaskets anyway...what do yall think.

sounds as though you are looking in the right directions

Sure enough I have one spot where I run my planes in the driveway. There the screw was, also noticed that when the one scree isn't in, the carb has a large gap between it and the engine...the screw that is there whne tight makes it tilt slightly. Both are back in and locktite applied...will try and run her after dinner...

Just ran her fired right up! BTW this plane is for sale...going back to electrics...easier and less time consuming!

At least you feel a little better than a couple hrs ago

I have a Quadra 35 with a Walbro carb (no choke). I had a fuel problem - turns out the hose came off in the tank - but, in the meantime I messed with the needle settings before recording their original positions. Now I can't start the engine, even after rebuilding the carb. Anyone know what the default needle settings should be for this engine with a Walbro carb?

Thanks - Mike