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General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc / Re: Okmo Engine Spark Plug Connection
« Last post by Raphael on 3 hours ago »
Hi Darryl,

I noticed the same thing on all my engines and simply trimmed a bit of the red insulation so the copper would fill the spark plug boot.

It’s not an issue as long as the spark is good.
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General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc / Re: Okmo B02 Loss of Timing
« Last post by Raphael on 3 hours ago »
Bonjour,

Just a suggestion, for all these engines, the spark should fire when the piston is at top dead center.

Perhaps just a few degrees before or after would be useful, sorry, I can't confirm this assertion.

I hope this helps your friend.

https://youtube.com/shorts/4YDPvMnXzUA
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General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc / Okmo B02 Loss of Timing
« Last post by Hassellbear on September 08, 2026, 02:46:01 pm »
A friend just received a new Okmo B02. Unfortunately, the crankshaft timing gear slipped to the side in shipping and disengaged from the crankshaft timing gear, so the timing is now off. My friend says he can't find any timing marks on the gears.

Does anyone have any suggestions on setting the timing gears?
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General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc / Okmo Engine Spark Plug Connection
« Last post by Hassellbear on September 08, 2026, 10:57:28 am »
While checking spark on my Z01, I noticed when the plug is fully inserted into the rubber boot there is a significant amount of space between the terminal end of the spark plug and the inner end of the boot. I noticed the same thing on my B01. There is enough space so that you can depress the end of the boot a good bit using your finger. My theory is the extra boot length doesn't always provide a good connection between the spark plug wire and the plug terminal. To remedy this I wound a coil using solid 20 gauge copper that fits over the plug terminal, slips into the plug boot, and presses firmly against the plug wire at the rear of the boot. After the mod, the spark was stronger and more consistent.

All the best,

Darryl
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General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc / What size hex wrenches for OKMO engines?
« Last post by SteamerJ on September 08, 2026, 10:50:17 am »
Hi guys. I want to order a nice set of ball end Allen wrenches for when my engines arrive. What size range should I get?
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General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc / Re: Retrol HM-01 quality?
« Last post by Junkologist on September 07, 2026, 07:38:03 pm »
I’ve built two of these engines so far and am very impressed with the quality. The first one I built started right up and ran perfectly right out the gate. The second one I haven’t run and may just keep it that way so it stays in pristine condition.
Assembly instructions are a bit vague, but if you know your way around a hit & miss engine, you shouldn’t have any problems. A novice may have a difficult time with it.
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General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc / Re: What fuel are you using?
« Last post by Raphael on September 07, 2026, 03:25:46 am »
Bonjour John,

For all my engines, in France,  I use Best Fuel 2-stroke Alkylate petrol.
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General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression – etc / Re: Retrol HM-01 quality?
« Last post by Raphael on September 07, 2026, 03:19:15 am »
Bonjour,

I have this engine and here is my feed back in the description :
https://youtu.be/2YsHMQbtD0Q
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General Discussion - Model & Toy Steam Engines – Stirling Cycle – Flame Lickers – Small Antique Originals / Re: eBay Commerce UK Ltd Confiscated My Engine
« Last post by Jim on September 06, 2026, 08:04:39 pm »
Oh man that just sucks.
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General Discussion - Model & Toy Steam Engines – Stirling Cycle – Flame Lickers – Small Antique Originals / Re: model traction engine
« Last post by G on September 06, 2026, 06:47:49 pm »
More pictures please. I love these size engines.
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