Microcosm H74 Engine Ring Replacement & First Start!
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- Опубліковано 11 лют 2023
- This engine came in for repair from a friend in PA. He attempted to start it but noticed that it was low on compression, so here it is on our bench. Let's see what all is going on, make the proper repairs and get it running for the first time. This video should help anyone with an H73, H74, or the H75 (Holt) model to see the process of piston ring replacement. Thank you all for watching. Please help the channel grow by Liking, Sharing and Subscribing.
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That thing runs great! Good fix too! I like the common crankshaft sound.
It sure does have a good sound to it. Ring replacement sounds intimidating but it goes pretty easy if you need to do it. I really like how smooth and even it runs, I hope he enjoys it too
That's impressive for sure!
You give a whole nother dimension to "small engine mechanic". Thanks for posting!
I'm glad that you enjoyed the video. Oddly enough, I was a Briggs, Kohler, Techumseh and Honda certified small engine mechanic even though I don't do it for a living anymore. I still enjoy working on small engines and have been known to fix them occasionally too 😉
So cool! I enjoy watching you tinker on these model engines. I just ordered the r27 engine. But really wanted to see the h74 so thanks 👍
Hi Samuel, I'm glad that you're enjoying the channel. The R27 looks like a great little engine, I bet it has a sound all its own too. After working on this h74 I am thinking that I "need" one too. Thank you for watching and for commenting 👍
@@steam212 well I got the R27 engine and it ran once and had good compression, but then it lost compression. Any suggestions?
@@samuelhibbard884 have you checked the valve clearance? I'm sure that you added oil to the crankcase and also used mixed fuel when you were ready to fire it up?
@@steam212 yes I used the same stuff you use in your videos. It has oil in the crankcase and 50:1 gas. Good spark. It's not out of time, It had great compression but after it ran for about 3 minutes then it died and lost compression. It has a really different carburetor on it.
A great video. Nice engine.
Regards
Steve.
Thank you Steve. I'm glad that you enjoyed watching it. Thank you for your interest and for commenting 👍
Interesting hobby.
Thank you WRXS, I enjoy it. They don't take up too much space but somehow manage to take up your free time 👍. Thank you for watching and commenting 👍
your back YAY
That is a cool motor
@@flynnclement3254 I really enjoyed this one, I may have to look into one for the shop 👍
Sorry for taking a break from the videos after Christmas, I needed to get the shop back in order and wanted to rearrange some equipment. There are a few videos out before this one. I'm glad that you're enjoying the channel, thank you for watching and commenting 👍
Hello friend. I have an h74 that I stop working it feels like it has compression I’m working on it right now. You think it can be current I changed the batteries I just have to change the piston rings after that if it doesn’t start I’ll be afraid it’s the coil
I have a H75 Engine,after a view times of running he not start again.No Compression!
I change the piston o-rings with spare rings 13x1 mm ,same problem!
Then i buy o-rings Typ FKM 13,5x1 mm and now he starts per hand,and he has always god compression!
Very good tip! Thank you for sharing it with all of us 👍
Wow! How much does that engine cost?
How does it perform under load???
Not very well, I always need to remind myself "scale engine, scale load". I really need to build an adjustable load (prony brake) so we can hear and see what happens. I really wish I could give you a better answer, but you did spark an amazing idea that I'll get to work on.
@@steam212 First of all, happy new year, second, thanks for responding, really appreciate that.
Asking, because I am allready since quite some time working on "extreme low speed engines"...
Not really interested in how well the governor keeps up, but AM interested in how well the engine deals with increased load at constant (LOW) rpm.
Here's an idea of what I am talking about, a single cylinder 5 cc fourstroke driving a variable pitch properller at governed 1500 RPM. The engine is modified to run on gasoline (consumption: 15 ml/hr at max achievable boat speed, which is approx 50% of max achievable engine load)
Load test (thumb against flywheel) with electronic governor active:
ua-cam.com/video/EeExUNp7Gus/v-deo.html
My estimate is that I am seeing 30~40 Watt here.
The boat: ua-cam.com/video/20EiBJfWSSo/v-deo.html
Right now, I have a Cison OHV fourcylinder coming for a larger project, hoping for 100 Watt @ 1500 RPM