G62 idle problem

[mogley]

Hello,

Just maidened by new Toni Clark Cap 21 today running a G-62 with Toni Clarks muffler and Hydromount System (rubber/shocks). Also, the carb intake and pressure line is in the fuse. Motor runs and starts fine. Idle is good at approx. 1600 rpms. Transition is fine and it turns approx. 6300 RPMS with a MENZ 22 x 10 and will hold the rpm (muffler seems a little restrictive, but super quiet). Here is my problem, during the first flight, the engine appeared as it would not accept throttle anymore, I landed and transition was a little hesitant, nothing major. It then would not accept throttle and died, just as it seemed in the air.

Is the low end to lean or to rich?

I also noted some unburnt fuel on the underside of the wing????

I thought the low end might be to rich and will lean her on the low end, is this correct????

any help is appreciated

thanks

Stefan

[zoomer260]

	Quote: Originally Posted by mogley
	Hello, Just maidened by new Toni Clark Cap 21 today running a G-62 with Toni Clarks muffler and Hydromount System (rubber/shocks). Also, the carb intake and pressure line is in the fuse. Motor runs and starts fine. Idle is good at approx. 1600 rpms. Transition is fine and it turns approx. 6300 RPMS with a MENZ 22 x 10 and will hold the rpm (muffler seems a little restrictive, but super quiet). Here is my problem, during the first flight, the engine appeared as it would not accept throttle anymore, I landed and transition was a little hesitant, nothing major. It then would not accept throttle and died, just as it seemed in the air. Is the low end to lean or to rich? I also noted some unburnt fuel on the underside of the wing???? I thought the low end might be to rich and will lean her on the low end, is this correct???? any help is appreciated thanks Stefan

Any hesitation on throttle up from idle I ever had was too lean on the low end. As far as unburned fuel on the plane I have only had unburned oil .

This can be the type of oil used to the ratio of oil to gas or a rich high end setting. OR any combination of these. Lawn Boy is the best example of "type". Nasty stuff.

[mogley]

yes, I'm sorry. I meant a little unburnt oil. I'm using amsoil at 50:1. Where does the unburnt oil come from?

[stung93]

Is this a new eninge or a used one, and have you tried setting the needles back to the factory recommended and starting over from there?

[mogley]

the engine is new, about 2 tank fulls through it for now. Tried the factory settings, which are not even close due to the intake trumpet on the carb. Just wondering, since I tuned the engine w/o the cowl that the engine might get warmer now and this might cause the engine to run leaner now....

[Barn-E-Stormer]

First thing to check is the butterfly. The G62 is bad about the butterfly coming loose in the carb and causing all kinds of funny problems.

I find it easier to set the low end too rich, then let it idle for 20 seconds and punch it. If it hesitates or burbles keep tweaking the low end leaner till you get a good transititon. Maybe leave it a litte rich on the ground since they lean out in the air due to heat.

[go29kev]

i have 2 g-62's and no problems in the serville years in service. we use zenoah oil mixed at 32:1. and i am running a 22-10 prop and carb adjustments are just a little off from factory just as a fine tune. i am running a power ram from B&B on the carb that sticks out of the cowl to help draw air in. if you do not have a air intake that sticks out from the cowl then you might not be getting a good air flow. but i have had 1 of my engines redone 3 times by B&B cause of planting it and killing the crank and carb. so if you need to give him a call and i am sure he could give you some help. he has always done me right. and to answer any questions about the oil mix here is what the manual from zenoah has printed.

Break In-

No specific break in is required. The engine is gradually
broken in as it is used, and the output power increases

gradually as the engine breaks in.

-Fuel—Mix gasoline and 2-stroke gas compatible oil at a

mixing ratio of 25–40:1.

-Recommendations:

To extend the life of your Zenoah

® engine, the following
is recommended:

1. Use an Evolution quality 2-stroke oil mixed at 32:1

Standard settings of each needle is as follows:
a. Low-Speed Needle: 1

1/8 plus/minus 1/4

b. High-Speed Needle: 13/8 plus/minus 1/4

[mogley]

I was running the same oil I was running in my DA 50, amsoil 50:1..... maybe that's the problem

[rcign]

The disc in the HDA48D carb on ALL g62s is no more likely to cause problems than any other disc in any other Walbro..Same screw..Older ones were staked on the threaded end after the screw was put in..Newer ones have what looks like a little square indentation in the end of the screw...Problems arise when owners take the screw and disc out to put one of Horizon's steering arms on the shaft...The screw should have some Loctite on the threads to keep is from loosening...21 years of working on G62s, no unusual screw loosening UNLESS the above scenario has taken place....

[mogley]

I don't understand, which scenario are you referring to?
i did not remove any screws from the disk and they are all still there.

As stated above, Toni Clark also states if the intake is in the fuselage (carb rerouted via 90 degree + the trumpet), factory settings will be off.

The engine appeared to accelerate fine, but after the maiden it would hesitate and wenn "goosed" just quit. Would you recommend leaning or richening the low end to remidy this problem? If necessary I can attempt to post pics of my setup, or it can be viewed at http://www.toni-clark.com/index_en.htm (just scroll a bit down and you will see a red cap 21 w/o cowling). This is the same setup I have.

thanks

[Barn-E-Stormer]

For a quick try just richen the low end. If that fixes your problem great. But.....you really need to take a close look at the butterfly (which is inside the carb) and check to see if it is loose and not opening or closing fully. Also look at the end of the shaft which is attached to the butterly, the "disk" as stated in previous post. The end of the shaft may be slipping on the control linkage.

If you find a problem it's nothing you did. It's just a fact of vibration.

[mogley]

I did not mount a different control linkage on the carb though, running the stock version