Harley Evo 1/5th scale Preserving cam area with grease Microcosm R33
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- čas přidán 19. 10. 2023
- This Microcosm R33 1/5 scale Harley Evo runs great. It's worn in and required a very slight tweak to valve clearances. Now it runs perfect and I don't want any more cam or cam follower wear. I have it on good authority from channel friends commentary that "Marvel Mystery Oil" in the fuel tkes care of this elegantly, but I don't have...yet. Will use grease with a bit of oil. This is a great idea for any of these Chinese semi-scale models and vintage models which don't have cams and cam followers designed for long use.
New camera is an improvement, Thomas
Yeah about time too. Thanks XL!
Good to see someone else with this engine ! I love running mine and showing it on my channel 😁 Hm01 is next to get added to my collection
Superb Thomas.
But they are just a little too small and fiddly for my liking!
Yep it is a concern. v small. ...welcome to the comments!!!
very nice😍
Hey Sam, n ice to see you. Keep up your content, I do watch :)
My suggestion is to use less oil. These valves are tiny and get covered in burnt oil and wont seal properly
The spark plugs foul really easy witn too much oil as well
The loose cam gears is the common design flaws of these microcosm V twins .
Funny you should suggest this now, because I'm starting to suspect the same. Obviously always been paranoid about the engine wear of these desktop models with poor fit eg big and little end of conrod, and cams. Recently I'm seeing better manufacturing from China. The new Harley model from Microcosm is wearing in nicely but I'm getting a bit of loss of compression on one side. I'll try a clean. I have already changed the duel to use a bit less oil but will further experiment. Noted, thanks for your suggestion and support!!
@ThomasPCGuruENGINES these v twins specially with brass cam shaft are nightmare
I had a R31 and it was utter rubbish when it came to reliable running and actually giving joy. Jin is a great designer but the manufacturing is crap.
Sadly no amount of oil is going to overcome the flaws. I noticed these v twins run hot. And the piston o ring get shot quickly. Next are the camshaft lobes, then valve misalignment. The other issue is crap quality screws . He uses these tiny screws on the cam followers at the bottom of pushrods. Due to heat and pressure they start turning and you will end up having misaligned lifter movement, causing lack of compression, bad combustion and more problems as the result .
I always run jins engines in front of a desktop fan . I think if Musa and Cison start making similar engines, I would never buy jins engines and I suggest others to do the same
Lots to think about in that... I have had comments from others that their Microcosm vtwins just run better and better, but your experience is awful. My experience with the Cison vtwin has been way worse .
MUSA quality judging by looks along looks very attention-to-detail.
I'll have to have a think about your comment. I think the quality of our Chinese model engineering has improved vastly since the first hit-n-miss. I'm always excited to see the next engine
Thomas, my R33 engine’s cylinder closest to the fuel tank does not run. Because of this the engines performance is bad. What cylinder are you looking at when checking to see if it sparks at TDC?
Some things to try: new batteries, switch spark plugs, richer carb needle setting, clean the sparkplug..
As for TDC, if one clyinder is working well it should be same with other unless its like 45% off which has got to be unlikely? I may be wrong here, this is not a hit & miss engine so isn't only firing at really slow speed. Maybe before tdc is better if you want this to rev. I will work one cylinder at a time. Take out the spark plug, poke in something to hit the piston, turn the engine and find where that piston is highest. Hold that point and mark on the flywheel directly in like with the center of that cylinder.
Then you can turn on ignition and hold the end of the spark plug against the engine metal. See if the sparking is right where the flywheel mark passes the center of that cylinder. Your problem is a frustrating one. Compression? Fuel? Spark? work it through