Hi,
I have a quadra 35 that a friend has been helping me to get running. It is old but seems ok. We put a new coil on it, seals front and back and a new ring. It runs but is ruff. It barely transitions and often dies. It idles ok. At the high end it gets 5500RPM at best with an 18-6 zinger. It seems to have more than usual vibration. We ran it today at the field. Any help would be great. The crank does not seem to be bent. The fly wheel may need balancing? I'm at a loss and my friend is too. He really has put in some time on it so I'd like to get it in the air ASAP. The engine came from an old Mallory Lazer.

Thanks

Joe

Hey Joe I have a Q-35 I bought new in 1984. It was not used for a period during the 90s and was hard to start and ran bad last year. I found that the carb was gooed up with old gas remains. I dissembled and cleaned the carb and it was like new again. You might check this.

rebuild the carb it may need a diaphram kit
also check ignition timing seeing as you had the engine apart.
if the timing is off you may be getting detination

If the engine isnt tuned properly wich all of the above will effect itll jump around and shake like a bugger.

Old Quadras have points under the flywheel..You could remove the flywheel and check the points and point gap..The gap is cast into the plastic cover over the points....The wrong gap will affect the timing.....If it's too wide the timing will be retarded.....

Thanks! I will pass this info on. The carb has been dismantled and cleaned. Thanks RC for that point tip! It is very much like the timing is off. My friend mentioned that the carb did not pull fuel well. What could that mean? When the throttle is advanced the engine dies and seems to be going lean. What RPMs might I be looking for with the 18-6 zinger? Oh, I am sure that he knows this but about how many turns out would be a good starting point? I'm really excited to get this vintage plane and engine back in the air, thanks for all your help!

Joe

If it has a walbro carb on it and it has been sitting for a long period of time you should put a rebuild kit in the carb as the diaphrams get hard in them. This will make it not pump fuel.
A walbro carb is more or less vacumme fuel injection for less of a better way to state it. The diaphrams in them are the fuel pump. and fuel metering. If there is any corosion in the carb from sitting replace the carb they are not real expensive and it will save you major headaches

If the diaphrams harden up at all they won't pump fuel or meter properly. I'd put a kit in it if it's questionable. Should swing an 18-8, which is the most popular prop for this, at close to 7000. Normal carb settings, if everything is right, is 1 turn on high speed and 1 1/4 on low on average Q 35.

If RCIGN1 does not have the Nova points eliminator call Dick Bennett and get one (about $15). This will do away with the points behind the flywheel. They work great (have one on my Q40). This will also help with radio glitching which I had.

I have the old mallory laser almost ready for a maiden flight. All up weight is 14.5 lbs. right now less spinner.Thanks everyone for helping with the quadra. We rebuildt the carb. Put a new ring, coil and seals in it and a real good cleaning. It was a lot of work that my friend did and I am very greatfull. I'll try to get some pictures before the flight. I have a question. If we put a new ring in it should I run petrolium based oil for the first gallon? It starts by hand but this is my first quadra. Any tips? It runs really good. I wish my zenoha 45 was that smooth. I got a zinger 18-6 on it now. I might try a 18-8 later. Thanks again guys,

Joe

Here is a picture,


Joe

Joe:
I run 30% oil all the time, no need for synthetic. Will take a while to put out full power till the new ring gets broken in but it just keeps getting better. You will find an improvement with the 18-8. What RPM is it turning?

Thanks Flypaper. I mix synthetic for my other engines 5 gallons at a time. I just wondered if I should try to set the new ring by running petrolium based for the first gallon. Today the quadra will not run! I am perplexed. I'll try to get some help locally.

Joe