I was preparing my Mash Fifty for bike season when I heard a noise from the engine, and I decided to investigate it further. The dealer claims that these engines don't last more that 25.000 kilometers, and mine is at 21.000 km's. That is a bold claim, and there is only one way to find out wether or not these engines have a limited lifespan.
In this very detailed video I show all the steps to disassemble and rebuild a Mash 50cc engine, and we'll have a closer look at the build quality, wear and durability. You can follow the chapters to skip through this video.
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0:00 Intro
1:11 What is wrong?
2:02 Emissions system explained
6:05 What could be the problem?
6:23 Engine disassembly
7:04 Inspecting the clutch
7:48 Clutch removal
11:24 Oil pump mechanism
12:19 Generator cover removal
14:00 Cylinder head removal
18:05 Cylinder removal
18:26 Piston removal
18:55 Splitting the crankcase
19:34 Removing the shifter mechanism
23:11 Crankcase inspection
23:30 Gearbox removal
27:15 Plot twist - End of life for this engine?
30:28 Will Honda parts fit?
31:25 Gearbox comparison
34:25 Engine reassembly
41:55 How to test the gearbox
43:20 How to test the kick starter
45:00 Clutch assembly and advice
53:15 Cylinder installation
54:36 Cylinder head installation
55:05 Timing chain guide upgrade
1:00:00 Timing chain installation
1:04:30 Setting the valve timing
1:06:30 Timing chain tensioner
1:11:50 First start
1:14:10 Test Drive
1:16:10 Verdict on the lifspan
1:17:10 Outro