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

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M90 Loose Crank Shaft Bearings ? M90 Loose Crank Shaft Bearings ? 70Rcode · February 03, 2020, 11:40:53 am Hi all,..Anyone notice the very Loose main crank shaft bearings ?? Compared to usual Quiet running & feels just rite clearance ... 21 Replies · 7720 Views Started by 70Rcode « 1 2 »	21 Replies 7720 Views	February 24, 2020, 03:33:56 pm by odu50
M90 Cylinder Wall Finish ? M90 Cylinder Wall Finish ? 70Rcode · February 21, 2020, 11:10:52 am Hi all,... noticed my M90's factory smooth cylinder wall finish. Has anyone tried the major rubber o-ring mfg's reciprocating ap... 3 Replies · 1991 Views Started by 70Rcode	3 Replies 1991 Views	February 24, 2020, 04:51:10 pm by 70Rcode
M--90 Loose Flywheel Fix Update M--90 Loose Flywheel Fix Update 70Rcode · June 03, 2021, 06:45:24 pm After 2 loose flywheels events within 1st 2 months daily running, I tried an Economical non-machine shop once & Done fix attempt... 0 Replies · 1422 Views Started by 70Rcode	0 Replies 1422 Views	June 03, 2021, 06:45:24 pm by 70Rcode
M90 Fuel Mixer Spraybar M90 Fuel Mixer Spraybar 70Rcode · March 01, 2020, 11:33:46 pm Hi all, ...anyone know how to rotate the Spraybar orientation within the venturi mixer unit and is the spraybar only removable ?... 2 Replies · 1403 Views Started by 70Rcode	2 Replies 1403 Views	March 02, 2020, 07:32:26 am by 70Rcode
M90 Lubrication Question M90 Lubrication Question 70Rcode · January 09, 2020, 05:59:07 pm Hi all, this Silver M90/ET1 being my 1st gas engine with Rubber piston O-rings, what is best fuel mix ratio & direct applied L... 0 Replies · 1743 Views Started by 70Rcode	0 Replies 1743 Views	January 09, 2020, 05:59:07 pm by 70Rcode
M90 Weak Battery Reminder ! M90 Weak Battery Reminder ! 70Rcode · February 17, 2020, 02:21:53 am EVerything looks & sounds normal but your M90 gradually starts running problems or chasing the needle valve setting ?? ..Check /... 12 Replies · 6140 Views Started by 70Rcode	12 Replies 6140 Views	February 24, 2020, 03:13:25 pm by odu50
M90 Exhaust Valve Timimg Question M90 Exhaust Valve Timimg Question 70Rcode · March 12, 2020, 11:54:20 pm Hi all, Got around to checking my M90 Exhaust valve timing. It's Opening at 46 deg BBDC & Closing at 38 deg BTDC at the valve ... 11 Replies · 9935 Views Started by 70Rcode	11 Replies 9935 Views	March 21, 2020, 04:47:37 am by 70Rcode
M90 piston oiler hole Complications M90 piston oiler hole Complications 70Rcode · February 04, 2020, 01:18:47 pm Has anyone drilled thru the cylinder sleeve liner to add a oiler hole ? So far, this simple anticipated 0.065" thick liner has ... 13 Replies · 4079 Views Started by 70Rcode	13 Replies 4079 Views	February 29, 2020, 11:30:02 am by odu50
M90 Engine Displacement QuestionHi M90 Engine Displacement QuestionHi 70Rcode · February 19, 2020, 09:34:57 am Hi all, ...Looking at my M90 instruction sheet specs (and my digital calipers) the Cylinder Diameter at 22mm & an Itinerary (St... 4 Replies · 2124 Views Started by 70Rcode	4 Replies 2124 Views	March 25, 2022, 09:13:02 am by Adirondack Jack
M90 Cleaner Running Lubricant Trial Test M90 Cleaner Running Lubricant Trial Test 70Rcode · November 26, 2020, 01:48:01 am Playing around with my M90 using way Reduced MMO gas mix ratio ...Using MMO's standard recommended 0.3% lube/gas ratio at 1 drop... 12 Replies · 5243 Views Started by 70Rcode	12 Replies 5243 Views	December 01, 2020, 10:49:58 pm by Adirondack Jack
M90 Re-thinking 2nd O-ring Removal ? M90 Re-thinking 2nd O-ring Removal ? 70Rcode · December 05, 2020, 02:09:16 pm Noticing the popular recommendation of 2nd O-Ring removal for lube issues, after Very lite below piston cylinder wall ptfe oilin... 13 Replies · 5231 Views Started by 70Rcode	13 Replies 5231 Views	December 11, 2020, 08:34:04 am by Adirondack Jack
M90 Head Gasket Material M90 Head Gasket Material 70Rcode · February 13, 2020, 01:25:04 pm Hi all, is the M90 head gasket re-usable for reassembly or what type gasket material & thickness is suggested ? ..Thx, tom. 4 Replies · 2476 Views Started by 70Rcode	4 Replies 2476 Views	February 15, 2020, 09:49:23 am by Fullraceflathead
Mystery Screw On New M90 Hit & Miss Engine Mystery Screw On New M90 Hit & Miss Engine 70Rcode · December 27, 2019, 02:07:50 pm Hi all..Just received new M90 upgrade hit & miss engine with iron (?) Cylinder liner. Does anyone know what the "mystery" Allen/... 10 Replies · 3577 Views Started by 70Rcode	10 Replies 3577 Views	December 28, 2019, 02:57:01 pm by 70Rcode
O Ring Lubricant O Ring Lubricant 70Rcode · January 12, 2020, 07:30:08 pm This inexpensive low viscosity oil directly applied to cylinder wall seems to noticeably reduce O Ring drag & last about a dozen... 1 Replies · 1430 Views Started by 70Rcode	1 Replies 1430 Views	January 13, 2020, 09:52:49 pm by 70Rcode
At long last, the whippet engine is complete At long last, the whippet engine is complete Adirondack Jack · May 25, 2022, 07:26:42 pm After no fewer than 54 emails, cc’s and bcc’s, refusals, admissions, promises, errors, and ultimately fulfillment of exactly wha... 9 Replies · 3822 Views Started by Adirondack Jack	9 Replies 3822 Views	June 18, 2023, 12:35:01 pm by gamma13r
WWII miniature power unit. WWII miniature power unit. Adirondack Jack · February 02, 2022, 06:48:55 pm In reading about famed model engine designer E.T. Westbury, I came across mention of his secret WWII era work for the military, ... 2 Replies · 1375 Views Started by Adirondack Jack	2 Replies 1375 Views	February 03, 2022, 08:30:34 am by Adirondack Jack
A question of scale. A question of scale. Adirondack Jack · August 14, 2020, 01:35:02 pm Though I know that strictly speaking, a scale model is a replica of something that did or does exist, or at least that’s how we ... 6 Replies · 2122 Views Started by Adirondack Jack	6 Replies 2122 Views	August 18, 2020, 07:12:37 am by RedRyder
Propane/butane for H and M. Anybody done it? Propane/butane for H and M. Anybody done it? Adirondack Jack · November 05, 2020, 05:26:50 pm Just pondering the possibilities. The small engine conversions for lawn mower sized engines seem to do well, burning extremely ... 9 Replies · 3997 Views Started by Adirondack Jack	9 Replies 3997 Views	November 10, 2020, 02:09:55 pm by Adirondack Jack
R90S boxer engine. The good, bad, and ugly. R90S boxer engine. The good, bad, and ugly. Adirondack Jack · October 12, 2021, 07:23:47 pm When Jin first previewed his 3.2cc opposed twin in the manner of a BMW airhead, I was hooked. When they introduced the engine wi... 0 Replies · 940 Views Started by Adirondack Jack	0 Replies 940 Views	October 12, 2021, 07:23:47 pm by Adirondack Jack
The steampunk theme is taking off like a spanked whippet. The steampunk theme is taking off like a spanked whippet. Adirondack Jack · April 08, 2022, 10:38:56 pm Though I was slow to embrace the concept, once somebody defined steampunk for me, alternate future based on alternate past, I gr... 40 Replies · 10483 Views Started by Adirondack Jack « 1 2 3 »	40 Replies 10483 Views	April 25, 2022, 06:17:32 am by Adirondack Jack

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