that might be bearing material, they are very good running motors. idle very well too. i have,all 3 versions of them. gold head,black head and silver head.
Good to see an oldie brought back to life despite its condition. Hope you do a teardown/rebuild/refurb of it... Especially to see whats right/wrong with it.
Hi David. I have an Gold head with a 72 carburetor. The low speed is fixed. It have three different pipes which you can use. If you disassemble the carburetor you will see there is a slot where the brass item can be assembled. So you have to find the right pipe for the engine. They are marken 1, 2 and 3. Best regards Thomas
I have one of these. It was also known as the Goldhead. (There were rear induction models too) It is a ringed engine. Mine has a Type 72 carb. Is it possible that the front bearing has no seal on it?
As I look closer at this engine I believe I see a faint gold tint in between the head fins. I believe this is the gold head H60. This engine needs a new set of bearings for sure.
When you removed the glow igniter, the engine speed dropped and became rough. This tells me the plug is wrong (corroded maybe?) or the fuel is old and has water in it. (The engine dying from high speed is almost always water contaminated fuel). I would love to have seen if you had popped a fresh and preferably the exact recommended plug into the engine to see if it worked better. Also, some fresh fuel, if that was the problem. Maybe the compression ratio was changed and the engine was run on FAI or 0% nitro fuel. I grew up flying RC on 0% nitro fuel - just methanol and 25% castor oil and the engines ran fine and idled well. Having nitro when I was in Michigan seemed like an expensive waste and not needed. If you have some other carburetors for that engine, it would be beneficial to all of us if you tried some other carbs on that OS Max H-60. Sometimes, another smaller carburetor works well. I popped a swap shop SuperTigre carburetor on my ASP 61 ABC engine and it was a better engine for it. No more dead-sticks, better speed transition and significantly better fuel consumption. Also, the carburetor was a hell of a lot lighter that the ASP carburetor. Was the OS MAX H-60 a cross-flow engine? A comparison between 1970's technology and 2024 technology would be cool. Run an OS 65 AX as well and compare the specs.
My plug was good, my fuel is fresh. You are making FAR too many assumptions. See link in video description of what I think of assumptions. You are assuming that I have an unlimited supply of carbs and plugs. Do you? Perhaps instead of assumptions you could make some useful contributions to the channel. A box of OS carbs to try, new ‘recommended’ plugs for a 50+ year old engine maybe.
Well the tach shows the proper frequency/RPM when calibrated against a fluorescent light and there is a bit of lag in the readings. But the engine was not consistent at high throttle it was surging too.
@dmrcflyr2 thank for the reply. I was just wondering. I'm working on an ultralight aircraft and that engine runs up to 4000 rpm. When watching your video it seemed like it was more than your reading. I trust your result.
that might be bearing material, they are very good running motors. idle very well too. i have,all 3 versions of them. gold head,black head and silver head.
Good to see an oldie brought back to life despite its condition. Hope you do a teardown/rebuild/refurb of it... Especially to see whats right/wrong with it.
Front bearing seal bad too mate. Cheers for the vid's, love them.
They are sweetheart engines. Don’t let those bad bearings eat the ring up.
Hi David. I have an Gold head with a 72 carburetor. The low speed is fixed. It have three different pipes which you can use. If you disassemble the carburetor you will see there is a slot where the brass item can be assembled. So you have to find the right pipe for the engine. They are marken 1, 2 and 3. Best regards Thomas
I think the pipes are called nozzle. (Swedish is my main language 😊) thats why there are lack of words.
Way to rich on bottom end (i know the low speed needle is gouged out), and a bad plug mate. It's not that tired. Fresh OS no.8! Love the videos David!
Actually the plug is fine, it may not be correct for the engine, but the plug is fine. It is a short idle bar plug not unlike others of that era.
New bearings asap?
I have one of these. It was also known as the Goldhead. (There were rear induction models too) It is a ringed engine. Mine has a Type 72 carb. Is it possible that the front bearing has no seal on it?
As I look closer at this engine I believe I see a faint gold tint in between the head fins. I believe this is the gold head H60. This engine needs a new set of bearings for sure.
When you removed the glow igniter, the engine speed dropped and became rough. This tells me the plug is wrong (corroded maybe?) or the fuel is old and has water in it. (The engine dying from high speed is almost always water contaminated fuel). I would love to have seen if you had popped a fresh and preferably the exact recommended plug into the engine to see if it worked better. Also, some fresh fuel, if that was the problem. Maybe the compression ratio was changed and the engine was run on FAI or 0% nitro fuel. I grew up flying RC on 0% nitro fuel - just methanol and 25% castor oil and the engines ran fine and idled well. Having nitro when I was in Michigan seemed like an expensive waste and not needed.
If you have some other carburetors for that engine, it would be beneficial to all of us if you tried some other carbs on that OS Max H-60. Sometimes, another smaller carburetor works well. I popped a swap shop SuperTigre carburetor on my ASP 61 ABC engine and it was a better engine for it. No more dead-sticks, better speed transition and significantly better fuel consumption. Also, the carburetor was a hell of a lot lighter that the ASP carburetor.
Was the OS MAX H-60 a cross-flow engine? A comparison between 1970's technology and 2024 technology would be cool. Run an OS 65 AX as well and compare the specs.
My plug was good, my fuel is fresh. You are making FAR too many assumptions. See link in video description of what I think of assumptions. You are assuming that I have an unlimited supply of carbs and plugs. Do you?
Perhaps instead of assumptions you could make some useful contributions to the channel. A box of OS carbs to try, new ‘recommended’ plugs for a 50+ year old engine maybe.
Why do the rpm readings seem so low?
What do you believe they should be? What RPM does your MAX H60 get with a 12x6 prop?
@dmrcflyr2 I have no clue but at wide open throttle it seemed faster than the display. It sounded like 6000rpm.
Well the tach shows the proper frequency/RPM when calibrated against a fluorescent light and there is a bit of lag in the readings. But the engine was not consistent at high throttle it was surging too.
@dmrcflyr2 thank for the reply. I was just wondering. I'm working on an ultralight aircraft and that engine runs up to 4000 rpm. When watching your video it seemed like it was more than your reading. I trust your result.
I m not a expert, but thats a lot of ¿bad combustion?
duff plug
It glowed nice and bright. That is why i used it.
I was first to thumbs up, prize? Lol