the pope

Cmon charley how about using words that I dont have to google to find the meaning of !!!!!!!! I thought it was a swear word to begin with ( imagine my disappointment ) . Cheers the pope

hllywdb

I've always used the fuel line that comes with the stopper kit for inside the tank. It works fine for being imersed. But the tygon doesn't like the heat on the outside lines, especially running close to the engine or on the muffler nipple. There the stay flex works much better.

earlwb

I use a short piece of silicon fuel tubing off the muffler pressure fitting. Then I switch to other gasoline resistant tubing. The silicon tubing resists the muffler heat quite well. It also doesn't go bad from the gasoline fumes either. It would have to be immersed in gasoline before it swells and softens on you.

Charley

My Feedback: (2)

I've used Tygon in fuel tanks before. It will last for a few months before hardening, in my experience. There's are several long threads about fuel tubing on various forums; one on Flying Giants that I've looked at. Most seem to prefer Neoprene or Viton. Notably, Viton is what you'll find on the tips of most automotive carburetor float needles, so there's no doubt it can be immersed in gas. Neoprene is used in chainsaw fuel tanks. I'm looking for sources for Viton tubing.

CR

earlwb

Although neoprene fuel tubing works well, the problem is that tiny particles of neoprene can slough off the inside and can clog up the fuel filters or carburetor on you. With the utlility engines, you can see the effect in Walbro carbs after a while with the black gunk that gets caught on the screen filter inside.

geeter

My Feedback: (110)

Being as gas engines make great smoke because they have a hot running muffler . Has anyone thought of putting a small smoke system on a gx .40 ? Hey just thinking of the smoke system from mac's products with another pressure tap in the muffler is how they work and a check valve comes with it. What a great idea for a .40 size smoke plane with this gx .40. I have a real nice hanger 9 twist. 40 that would hold a small smoke tank and if I buy this engine it could work. I have a hobby shop that sells benol oil so it's in my thinking process to buy one.....RON

Charley

My Feedback: (2)

Points taken. I've had to take Tygon out of service periodically too. I've always thought about re-plumbing fuel tanks at the beginning of each flying season as being akin to rotating tires on the car/truck every 5,000 miles. Prosaic but necessary.

Today I spent some time on line trying to find a longer prop stud for my GX 40, in order to accommodate a spinner. Can't seem to find just what I want. Sigh, one of the down sides of living in a small town......

CR

the pope

Hi there Charles I think its been mentioned before that u can turn the prop stud around to get a longer length ( personally speaking I wish i could do the same ) . Cheers the pope

earlwb

I bought some 6mm prop studs from one of the online internet stores that sell such things. They come in several lengths too. But The Pope is correct, in that you can usually get the stock prop stud to work Ok by simply turning it around. The short stud in the pic is the OEM one and you can see that one end is longer than the other.

Charley

My Feedback: (2)

Deleted.

CR

earlwb

You could use a M6 screw or bolt and skip using a stud. You can even get those at the ACE hardware store in many different lengths.
Yes unfortunately the 6mm studs aren't in demand much so no one usually stocks them.

Charley

My Feedback: (2)

Don't think I want to use a stove bolt to hold my prop on.

CR

aspeed

Maybe a local motorcycle shop may have something in stock, or on an old head. Thanks for the link, I know where to get parts for my Tomos Moped now. Threaded rod would work too, just cut to length.

Mr Cox

Metric sizes are easily found outside of USA. On the smaller norvels I have taken stainless steel screws and simply cut them to length (not using the head part for spinners).

hllywdb

I have no problems running a spinner. You don't need the prop shaft bottomed into the crank. There is plenty of thread to hold. I have used both plastic and aluminium spinners with no issues and have yet to have one back out.

captinjohn

Karol...What is the amount of oil needed in the fuel??? A lot I bet!!!!! Capt,n

earlwb

Here are the fuel and oil instructions that come with the engines:

fiery

My Feedback: (2)

Can someone advise the muffler bolt spacing on the GX-40 in millimetres?

geeter

My Feedback: (110)

I think the oil content is suppose to be 14 percent. It has to be castor oil like benol nothing else will do.

earlwb

I think it is a little over 31 mm. The old MDS .40 engine mufflers may fit as maybe the YS .45 might fit too.

Charley

My Feedback: (2)

It's 32.4mm as near as these old eyes can read the scale on my slide-rule-scale caliper.

CR

fiery

My Feedback: (2)

Thanks!

Billsky

My Feedback: (37)

32.21mm is the spacing. I purchased a Kraft/RJL 61 hush muffler from mecoa. part #30-0102 https://mecoa.biz/shopdisplayproducts.asp?id=101

Charley

My Feedback: (2)

Looks like it might need a rear support for that extra can. Do you have it in hand yet?

CR

Billsky

My Feedback: (37)

I have it mounted, have not run the engine yet to test how the overall performance is with the muffler. it's on a hangar 9 tribute. The muffler seems to be pretty secure without any extra support required.
Weather is finally warming up. Will post how the engine runs with the muffler next weekend.