General Discussion - Scale Model Gas Engines - Hit & Miss - Throttle Governed - Non-Compression

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My Z01 came Tuesday My Z01 came Tuesday SteamerJ · October 14, 2026, 06:02:10 pm My Z01 arrived Tuesday and it is another great engine. I had trouble starting it the first time and ended up flooding it. I took... 2 Replies · 25 Views Started by SteamerJ	2 Replies 25 Views	October 15, 2026, 07:19:04 am by SteamerJ
Okmo N01 - First Impressions Okmo N01 - First Impressions Hassellbear · October 07, 2026, 09:31:10 pm The N01 arrived today. It ran this evening. [ Guests cannot view attachments ] https://youtu.be/h7KjWtDjxTEHere are a couple ... 7 Replies · 63 Views Started by Hassellbear	7 Replies 63 Views	October 14, 2026, 05:55:47 pm by SteamerJ
Was playing with ChatGPT Was playing with ChatGPT SteamerJ · October 04, 2026, 12:50:54 pm I asked ChatGPT to show me Thomas the hit & miss engine with a face. I think it turned out pretty good. [ Guests cannot view att... 2 Replies · 45 Views Started by SteamerJ	2 Replies 45 Views	October 07, 2026, 09:03:03 pm by Hassellbear
Retrol HM-01 Friction Starter Retrol HM-01 Friction Starter Hassellbear · October 01, 2026, 08:37:52 pm Here is a simple friction starter drill attachment for the Retrol HM-01. It consist of 3 simple parts. > Cutoff wheel mandrel... 3 Replies · 53 Views Started by Hassellbear	3 Replies 53 Views	October 05, 2026, 07:07:13 am by St Paul Steam
OKMO 1115 Miniature Gasoline Engine OKMO 1115 Miniature Gasoline Engine JinMachine · September 30, 2026, 07:43:09 pm 1,Single-wire ignition upgrade (cleaner than dual-wire)2,Faucet drain valve on water tank (no tools needed!)3, Oil piston pump l... 2 Replies · 32 Views Started by JinMachine	2 Replies 32 Views	September 30, 2026, 08:18:59 pm by Jim
HM-01 Compact Battery Setup HM-01 Compact Battery Setup Hassellbear · September 29, 2026, 11:12:58 am For the Retrol HM-01 at least 4 AA batteries in series are required since the ignition module is rated for 6V - 12V. Unfortunate... 1 Replies · 26 Views Started by Hassellbear	1 Replies 26 Views	September 30, 2026, 08:25:15 am by Fullraceflathead
How do you like your OKMO Z01? How do you like your OKMO Z01? SteamerJ · September 28, 2026, 04:14:37 pm I’ve been pondering getting a Z01 and would like the opinions of current owners. Are there any issues that you have had? 3 Replies · 34 Views Started by SteamerJ	3 Replies 34 Views	September 29, 2026, 09:20:52 am by Hassellbear
OKMO BO2 timing and glass oiler questions. OKMO BO2 timing and glass oiler questions. TinkerGuy · September 22, 2026, 03:46:16 am Good morning! I’m new here but I’m hoping someone can point me in the right direction. I ordered an Okmo BO2 from enginediy as m... 7 Replies · 77 Views Started by TinkerGuy	7 Replies 77 Views	September 27, 2026, 07:51:19 am by Fullraceflathead
Compact Jin Engine Starter Compact Jin Engine Starter Hassellbear · September 19, 2026, 04:06:28 pm Due to some hand issues, I don't have the grip to start my engines by hand flipping the flywheels. A cordless drill works great,... 2 Replies · 70 Views Started by Hassellbear	2 Replies 70 Views	September 20, 2026, 10:19:06 am by Fullraceflathead
Okmo Recommended Spark Plug Gap Okmo Recommended Spark Plug Gap Hassellbear · September 19, 2026, 09:44:02 pm I asked Okmo about the recommended spark plug gap for the 3/16-40 plugs used in their engines. The response from Jin was 0.1-0.3... 1 Replies · 31 Views Started by Hassellbear	1 Replies 31 Views	September 20, 2026, 12:10:29 am by Jim
What fuel are you using? What fuel are you using? SteamerJ · September 05, 2026, 03:28:15 pm I just ordered an OKMO B01 and B02 today. My birthday was in July and I couldn’t think of anything I wanted at the time. After s... 9 Replies · 231 Views Started by SteamerJ	9 Replies 231 Views	September 20, 2026, 12:08:58 am by Jim
What size hex wrenches for OKMO engines? What size hex wrenches for OKMO engines? SteamerJ · 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? 1 Replies · 89 Views Started by SteamerJ	1 Replies 89 Views	September 19, 2026, 08:43:11 pm by Tcommander
Okmo Engine Spark Plug Connection Okmo Engine Spark Plug Connection Hassellbear · 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 ... 3 Replies · 152 Views Started by Hassellbear	3 Replies 152 Views	September 19, 2026, 08:37:10 pm by Tcommander
A day of frustration! A day of frustration! SteamerJ · September 17, 2026, 07:34:42 am My OKMO B01 & B02 arrived Tuesday and I was stoked. I mixed up some Coleman fuel and Marvel Mystery Oil with a 25-1 ratio. I mes... 8 Replies · 160 Views Started by SteamerJ	8 Replies 160 Views	September 19, 2026, 09:02:51 am by Stoker
OKMO BO4 OKMO BO4 Dwulfe · September 10, 2026, 09:18:59 am I thought this was interesting. Looks like a Gade air cooled model. Survey and imagehttps://ztz.soundestlink.com/ce/c/6a4cfce98e... 1 Replies · 159 Views Started by Dwulfe	1 Replies 159 Views	September 10, 2026, 10:00:48 am by Raphael
Okmo B02 Loss of Timing Okmo B02 Loss of Timing Hassellbear · 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 ... 2 Replies · 159 Views Started by Hassellbear	2 Replies 159 Views	September 09, 2026, 08:26:13 pm by Hassellbear
Retrol HM-01 quality? Retrol HM-01 quality? SteamerJ · September 06, 2026, 10:15:11 am I like the look and size of the HM-01 and wonder how it compares to Jin’s engines. I would like to hear the thoughts of anyone w... 6 Replies · 241 Views Started by SteamerJ	6 Replies 241 Views	September 09, 2026, 07:35:12 pm by Hassellbear
D16 Diesel Side Shaft Engine by Retrol from Stirlingkit D16 Diesel Side Shaft Engine by Retrol from Stirlingkit RedRyder · June 23, 2026, 06:34:14 pm Here is my newly arrived diesel engine by Retrol.I was warned in advance by our friend Miller that it is a messy piece of kit.He... 9 Replies · 366 Views Started by RedRyder	9 Replies 366 Views	July 17, 2026, 10:14:27 am by Fullraceflathead
Found a Couple Retrol Hit & Miss Engines at the Flea Market! Found a Couple Retrol Hit & Miss Engines at the Flea Market! Junkologist · June 24, 2026, 09:57:09 pm I have to share my stroke of luck at the local flea market last Saturday. I was making my normal rounds when I happened to look ... 6 Replies · 206 Views Started by Junkologist	6 Replies 206 Views	June 25, 2026, 12:54:10 pm by tenniV11
OKMO N01 Vertical Single-Cylinder Engine Model OKMO N01 Vertical Single-Cylinder Engine Model JinMachine · June 16, 2026, 06:05:15 am Here is a new engine model for you: the OKMO N01 Vertical Single-Cylinder Engine.This is a structural model of a vertical single... 2 Replies · 273 Views Started by JinMachine	2 Replies 273 Views	June 16, 2026, 11:00:45 am by Raphael

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