multiflyer

I have a pair of G26 engines and they just are not reliable at idle. If the low mix is a little rich it quits during extended glide especially at fast airspeed. If low needle is set a little more lean it starves upon rapid throttle up. No happy setting. Both my engines do this. I'm not the only one. Many in my area are reporting reliability problems at mid and low throttle - at sea level using normal fuel, oil prop, muffler - nothing strange. I think the stock carb is a miss-match, over sized and just doesn't meter well enough at low power settings. Any other G26 users out there having similar experience??

Multiflyer

rob r

My Feedback: (57)

remove the black air horn on the end of the carb. i had same trouble and now i love mine.

GeraldRosebery

My Feedback: (14)

I found the engine developed this tendency after it began to run in. It was fine when brand new. Same as you - sea level, normal gas and oil. I tried electronic ignition - no change. It's the carb that's doing it. Would like to get some input as you do.

karolh

Lots of folks run this engine and it performs flawlesly, however Ralph made a comment a while back regarding tuning of the carb, saying that it was a bit tricky at times to get it's big carb just right.

He might chime in here and give you guys some pointers on solving your problem.

Ed

No problem here at 3000 ft. As seen below in ma Chippy, not using the velocity stack.

Sweetest little engine ever made !

> Jim

davewallace

My Feedback: (29)

Hi Flyer,
If removing the stack doesn't correct the problem, try any good Walbro carb of 11mm. The 12.7mm carb on the 26cc is on the large side for the engine. The most popular is the WA-167. The 11mm carbs have 28 cast into the intake. This is 28/64ths or 7/16ths. The stock WT-644 has 32 cast on the venturi.

Dave

multiflyer

I did try running it without the velocity stack, but there was a considerable amount of intake back spitting. A good amount of slobber collecting on the side of the fuse, even when leaned way down. The V stack is just long enough to catch the dribble. Fuselage side remains clean. I did not run the engine without the V stack long enough to notice how idle and acceleration behaved. I will try it again, but I want something that will work without the back spitting. I am going to try a G23 carb on it sometime soon.

Thanks for the responses,

Multiflyer

Antique

My Feedback: (4)

I tested the G26 with different size carbs, the one from the G23 works well, very little difference compared to the WT644..

Ed

That's not normal ! My idle is set a little rich for a good transition, and I have very little spit .

multiflyer

In addition to trying the smaller carbs, I'll have to try both my stock carbs again, with and without the Vstack. See if there is any difference between them. Another club member had a definitely bad carb delivered with his new G26. Wouldn't run consistently at any throttle setting. So there may be some small frequency of bad carbs being supplied??

Multiflyer

multiflyer

I checked the numbers on the G23 carb I have. It has 28S on the venturi opening. Do you know what the S means? Also it is a WA 197. You mentioned the WA 167 as being the most popular. It sounds like there are different versions of the 11 mm carb size. What would be the differences??

Multiflyer

karolh

My G23 manual specifies a WA 197A carb for aircraft and boats. The 167A is for helis. HTH.

Karol

davewallace

My Feedback: (29)

Hi Multi,
I don't know the "S" stands for, maybe someone else does. Walbro makes carbs to meet manufactures specifications, so there are a varity of configurations of all sizes out there. Your problems could be caused by a installation issue. Check for gasket leaks annd alignment of the pulse port to the carb. It is alway best to try a known good part to varify a bad part. A new longer stack to clear your cowl may be the answer.

Dave

multiflyer

The pulse port is the first thing I looked at. Nothing wrong there. Hope to try out the 197 carb this Sunday, and a smaller carb from a Rayobi weed whacker motor just for fun. I'll report the difference, if any?

Multiflyer

jbflier

Read the "G-26 Setup Tips" from Desertpig just a few days ago. He seems to have nailed any problems.................[8D]

Antique

My Feedback: (4)

The pulse passage in the insulator blocks is sometimes too close to the main hole and with any misalignment of the gasket there could be a slight leak...

multiflyer

So I got out to the field to test the various carbs Sunday. First run the engine was worse than ever. I found the carb spacer had one of the threaded inserts broken. Carb would not tighten down. Since these are so crappy, I carry a spare. Sure enough it went bad too just as soon as I put it on. Cracked all the way through and the threaded insert pulled out. I'm going to mail these back to horizon with a little nasty-gram asking why they're handing out such junk? I'm sure I'm not the first. I'll try again next weekend with the original carb spacers and 90 degree pushrod bell crank setup.

Multiflyer

karolh

Why not save yourself all that hassle and get one from Ralph.

stuffer

My Feedback: (11)

the replacement spacers are made from phenolic. hard pressed to crack those. (experience talking here)

multiflyer

I wasn't aware that there is an alternative carb spacer available. Do you know the contact info to find out more?

Multiflyer

blueberry

It's on his signiture at the bottom of his posts. Look at at post 16

PMJC

I have a g 26, do you think it will power the new great planes ultimate ? I,m not talking 3 d stuff but maybe sportsman IMAC.

multiflyer

I have been running my G26 on a 14 pound simple sport plane of my own design that I use as my flying test stand. It pulls it around fine for just having fun. I measure the static thrust at about 11 pound or so with a fish scale tied to the tail. This is stock with not the best prop. A friend had one on an 11 pound plane he designed. It would do just about anything. The Ultimate should have plenty of wing area to carry heavier weight, 14 even 15 pounds. But the weight needs to be low to get pleasing vertical, like about 13 and less. My guess is about 10 lb or less to start hovering capably and such. Just depends on how heavy and how verticle you want to be able to go.

Multiflyer

Antique

My Feedback: (4)

There's another 6 lbs thrust available if you want to use an Abell muffler and a Mejzlik 18-6 prop..
Not really cheap, the muffler is $39.95 and the prop is about $37.00

multiflyer

I haven't yet tried anything to maximize performance. Is the Abell muffler a tuned type of some kind? Is it very much louder than the stock can?? Is the rest of the engine stock or converted to electronic spark such as CH???

Multiflyer