GeraldRosebery

My Feedback: (14)

Has anyone tried one of these baby 15 cc gassers? BME rebuilds the inside to enhance longevity, but how do they perform and what prop has worked best? I can't get any feedback from BME, from three e-mails anyway.

Thanks guys!

krayzc-RCU

My Feedback: (31)

[8D] listening

Jake Ruddy

My Feedback: (40)

You will probably be hard pressed to get an answer from BME.

Most recent news is that BME is fixing all the engines that are in for repair and then after that point there is indication BME will be no more. I don't think it is official yet.. but I think you would have a better chance finding a used one.

GeraldRosebery

My Feedback: (14)

Does anyone else want to comment on the upcoming demise of BME? True they are down to one main product. Are they giving up?

Gyri

Hi, this may just be a late reply. I am just filling in my point for anyone who browses later on. I bought a BME G90 just when everyone was saying that Keith is a stand-up guy and he responds well when communicated. My experience was the same until December 07 when I stopped getting any replies. I had then just started having issues with my BME G90. No idea what's happened.

Gyri.

av8tor1977

My Feedback: (6)

What issues are you having with your .90? I have one that is runnng well.

AV8TOR

Gyri

Thanks for asking. At that time when I had posted, I had two issues, one was a desperate need to get spare spark plugs (broke mine) and the other was that my engine never held idle below 2700rpm. I had assumed for a while initially that the idling issue was due to my reworking the muffler to save weight (basically halved the chamber length and proportionately increased the opening). So I didn't bother to get back to BME on it at first, until I replaced to a spare Original muffler to find the same idling issue. I run a 14 x 6 APC wood prop. I looked at the carb last week and noticed that may be the coiled spring that tensions the butterfly plate may not be doing it's due. I am going to hook it in some way, only there doesn't seem from any pictures that I can get hold of, any obvious points to coil and latch this spring. How is it on your engine?

Regarding the Spark plugs, thanks to folks like you at RCU, manage to source it from CH ignitions.
reg, gyri

av8tor1977

My Feedback: (6)

Normally we clip the hook off that spring, and just let it float there to maintain a little sideways pressure on the throttle shaft to prevent wear caused by vibration. That spring is only used as a safety to close the throttle when the carburetor is used on power equipment such as chain saws, etc. We don't use them for R/C airplanes, as they are far too strong for the throttle servo to be battling to overcome.

You might try an APC prop. They are more efficient than wood props I have found, and they weigh a touch more which helps the idle.

AV8TOR

Tired Old Man

My Feedback: (1)

Just about any servo with more than 20 ounces of torque has no problem over coming throttle spring tension. The amp draw is negligible as well. There's not much benefit in disconnecting the spring, and removing the spring is not a good idea.

If you need spark plug for the BME G-90 contact CH Ignitions.

Gyri

I have got a mini servo, think its above 20oz torque. I am planning to latch that spring somehow as last week with the engine running, i put a finger and applied some pressure and it seemed to idle lower , only i could tach the revs. Whats the best steady idle revs you guys have had on this engine? might be good reference for me to work with. And a heavy prop could help.

Thanks for your replies.

BigBird1

My Feedback: (4)

Hey, been a while, off doing other things for a few years..
Ever take out the idle set screw along with unlatching the spring for a lower idle and use the trim tab as a backup kill..
I have two motors that I've done that to..

BB1

Gyri

Mt BME G90 doesn't have a idle set screw, guess it relies on what you recommend.

PlaneKrazee

My Feedback: (14)

Anyone want to buy a Classic BME 90?

cyclops2

I almost choked, when I saw that small plugs cost $ 15 to $ 17 . [:'(]

Jezmo

Don't let that scare ya. They last really well. I am still running the same one I started with in my SuperTigre 51 and it's even running a lot of oil at 16:1. It now has about 40 flights on it and the plug still looks perfect and runs great. When you consider that is only the cost of one gallon of glow fuel it really isn't all that much. I now use about 2/3 of a quart of gas per hour of flight time in the 51 and by the end of the first gallon of gas it has saved me the cost of the complete ignition system including the cost of the plug. (The fuel burn is less than half of what it burned on 10% percent glow) These converted 90's have needle bearing rods and can run at oil ratios of up to 50:1 so the plug should last years.

cyclops2

\

Do the ST 90's have bushings ?

captinjohn

Yes the .90 Super Tigers do have bushings....but are replaced with needle bearings. Thats why the engine is considered a conversion. Along with the spark ignition. Capt,n

KenLambert

My Feedback: (107)

here are some pics of my conversion

PlaneKrazee

My Feedback: (14)

Ken,

Are you using a Holo-Krome crank pin like Keith?

KenLambert

My Feedback: (107)

a hardened and ground pin

captinjohn

Ken: Is it a good idea to add a extra hole in small end of rod for lube? I know guys that do, on 4 cycle engines. Nice looking work in the photos you posted. Best Regards, Capt,n

KenLambert

My Feedback: (107)

I ad 2 on top / side/ staggerd

Robert_Ellis

I bought 2 of these engines and am ready to put them into a 90 size Edge and a 90 size Seagull Yak 54. Thanks for info on the spark plugs!!!
I have a couple questions tho.

1. What prop is recommended?

2. The stock muffler is HUGE. Can I use a pitts style muffler (meant for the SuperTigre 90)? is there a performance penalty?

Thanks in advance.

- Rob

KenLambert

My Feedback: (107)

1. I use a 15x4 wide apc
2. yes and yes you loose a few rpms
although the .90s I run are not the BME

NoFlaps

My Feedback: (131)

is the engine yuo're wanting to sell a .90 BME ?
If so, i'm interested