Bosshossv8

My Feedback: (10)

If you are running up a g-62 and begin to richen the High Speed needle....multiple turns....should there be a noticable change in RPM??? Should you be able to make it rich enough to run poorly???

Mine wont. 3 turns out is same as 1 1/2 turns out. RPM only at 6300 w/ 22x10 Zinger. Plug light tan and looking very lean.

my Tank is OK ..fuel pours from the line. No bubbles, no delivery problem....is the carb screwed??

Thanks.

TLH101

My Feedback: (90)

Check the intake screen under the pump cover (single screw) of the carb. It may blocked with crap. The screen is very fine and will get blocked pretty easy.

Bosshossv8

My Feedback: (10)

[quote]ORIGINAL: TLH101

Check the intake screen under the pump cover (single screw) of the carb. It may blocked with crap. The screen is very fine and will get blocked pretty easy.
[/quote

]

HI , Love Rat Fink.

I did try and found there to be very fine rust like particles in the screen. (I later founf the source , an eaten away fuel filter screen(brass Screen). I cleaned the screen after taking it out, but I dont knowif I got all the particles out if it.

Can you use welding tip cleaner rods or thin wire to push through the holes in the needles to see if they are plugged??

But is it right to assume that when full thrott ...opening the HS needle multiple turns should make it run poorly??? Mine stays on note at 6300 to 6200...

It cleaned an oily plug from a good running Quadra in just 2 minutes. And I mean CLEANED it.

Time to pull the carb again. maybe I am assembling the gaskets and diaphram wrong...

TLH101

My Feedback: (90)

If the screen is clean, you might try a new plug. On the carb, the gasket on the pump side goes against the cover, and on the metering side, the gasket is against the carb body.

Bosshossv8

My Feedback: (10)

hmmm... sounds like I got it right. The screen must still be plugged...the stuff that came out of it was VERY VERY FINE ...maybe it still plugged.

I am going to find out what is causng this and document it. I think turning the HS needle out multiple turns should make the engine bog and eventually quit .....

I will tinker with it tomorrow.

I should absolutely get more than 6800 on Zinger 22x10 ...6300 aint enough...it flies well but no sustained vertical at 20 lbs.

Antique

My Feedback: (4)

Take the muffler off
I am converting 3 G62s tonight...the first one turned a Zinger 22-10 6300 rpm with the stock muffler...That's what they do....

Bosshossv8

My Feedback: (10)

i have a B&B muffler on it.

Antique

My Feedback: (4)

New G62, Zinger 22-10, stock muffler, 6300 rpm, no muffler 6800 rpm...22-8 Menz, no muffler, 7200.....Air temp 68, altitude 6800, 32-1 fuel.....
The rpm goes down to 5100 with the stock muffler and 22-10 Zinger if the high speed needle is backed way out...The engine won't die....

Bosshossv8

My Feedback: (10)

multiple experiments today.

Tried putting a nipple on the diaphragm breather hole and routing the tube out of the wind.

Still can turn the H needle all the way out with no degradation of RPM.

air compressor blew out the body, re-assembled, same thing.

My diaphragm is a little distended (curved out) ..it is not tight as a drum. Eh???

Everything else is fine. Needles are un-nicked...baffled. Should i try a velocity stack ...facing backwards or forawards???

Simple mechanism, baffling problem.

swoop

Sounds like you definately have an air leak. I had the same problem with a G-62. I later found out that the gasket between the carb. insulator and the engine was missing. You should have two gaskets between the carb. and the engine. The first one is between the carb. and the carb insulator. The second is between the carb. insulator and the engine. One other very important issue is mounting direction of the carb. and insulator. When you install the carb, make sure the small hole in the insulator is lined up with the pulse pressure hole in the engine. Don't mount your carb backwards. I have seen many guys mount the carb backwards to facilitate adjusting the mixtures with the engine running. It will not run right. Your needle adjustments should face forward. This has to do with that little hole on the mounting flange.

waynem

My Feedback: (58)

I also have a G62 with C.H.ignition, Sycrospark and a zinger 22x10 prop. It only turns the prop. 6200 R.P.M. with a slimline smoke muffler. If that is what to expeck from a new engine, why does everyone say that the 22x10 is the prop. of choice for the 62 engine. Thanks for help from anyone that responds, Wayne M.

Rcpilot

My Feedback: (78)

G-62 with C&H synchrospark. B&B muffler. 40:1 oil.

Engine is still breaking in. Just under 4 gallons of fuel.

Elevation 6000'

Menz Ultra 22-10 = 7300RPM

Menz S 22-10 = 6800RPM

Pro Zinger 22-10 = 7200RPM

Bambula 22-10 = 5800RPM

Bambula 22-8 = 6300RPM

APC 22-10 = 7400RPM

The Menz Ultra works best for me. I get the most pull from it. I like the way the plane flies with this prop.

The Bambula props were terrible. They don't unload in the air--as the manuf. suggests. Plane flew like a turd.

APC 22-10 turns lots of RPM, but not the best pull. The Menz Ultra pulls better.

I just got a NIB Slimeline Pitts Smoke muffler for it. Haven't bolted it up yet. Anxious to see what it does to performance.

Rcpilot

My Feedback: (78)

IMO-break it in with a 20-10 or a 22-6. Keep the RPMs up and run it about 1/8th turn rich.

Remember--these are converted industrial engines. They like to rev. They are ported and timed to run at higher RPM. You can run a G-62 at 8000RPM+ for years and you won't hurt it.

Just like a chainsaw conversion. I prop mine for around 7800--8000RPM on the ground. They unload in the air--and I'm pretty sure I'm getting 8500RPM. Most chainsaws are designed to run in the 10,000+ range. If your lugging it down and turning 6800RPM--then your just going to overheat it and your cheating yourself out of the power that it developes at higher RPM--up in the powerband.

Same with a G-62. Let it run a few more RPMs during break-in. It won't hurt it.

waynem

My Feedback: (58)

Thanks Rcpilot, It took me awhile to reply to your post and advice. I will follow it. I found my problem with my G62 engine. The timing was set at 24 degrees and when I moved it to 28 degrees my R.P.M.s came up in line with what I have been reading. Square tip zinger 22x10 prop. a little over 7000 R.P.M.s on a low time engine. I am going to break it in with a lower pitch prop. Thanks Wayne M.