HM 01 Timing Adjustments
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- Опубліковано 25 сер 2024
- Fine tuning the timing on the HM-01
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My HM-01 had a whopping 45 degree ignition before top dead center. It ran very rough, difficult to start, stalled a lot. sometimes slamming violently in reverse halt turn. (yikes) after seeing this video My insulated spring had a bent arching bow shape to it, I straightened it to look like yours I now have roughly 10 degrees TDC The engine runs so much better now. easier to start, smoother running My HM-1 engine, after assembly did have many bugs that I had to learn to fix or adjust along the way. This video helped a lot.
I am glad I could help. Timing for slow running engines is 0-10. The advanced timing is for the burning fuel to develop pressure on the piston, so if you ignite the fuel at 20, 30, or 40 degrees before TDC, the engine has to be turning fast enough for the piston to be at TDC when the pressure is highest. With your ignition timed properly I am sure you'll have an easy time getting this engine to run nice and slow.
I were waiting for the run, Henry! 😢
It's like watching surgery you putting the contacts back.
I just can not get mine to start and run. It seems like it sparks on exhaust stroke as not a lot of compression as on other stroke.
I have triple checked timing and marks are dead on but it seems to fire 180 degrees off!
My crankshaft also looks different it’s round, not cut off along rod cap…new design???
They did update the crank web and are leaving them round instead of milling them square like mine so you got a new production version. There weren't any other updates mentioned but the Chinese manufacturers do include minor changes, updates, and improvements on each run of engines so I don't know if yours has any other differences from mine.
You said you think your timing is 180 degrees off, have you watched your exhaust valve carefully to see when it is opening and closing? The HM-01 rotates with piston moving down the cylinder while the connecting rod is going over the crank, the upstroke of the piston is when the crank goes down. The HM-01 cam lobe has 3 steps (high opens exhaust, middle closes exhaust, low has closed exhaust & closes ignition contacts) so you need to make sure that the exhaust valve is closed while the cam rides that middle step. Exhaust should open and BDC (or slightly before BDC) and remain open as the crank rotates down, then it needs to close at TDC (or slightly before) to make sure the atmospheric intake valve will activate. Also, double check your intake valve spring is *much softer* than the exhaust spring. If they accidentally put matching springs on your valves then the engine may not draw fuel.
I didn't have issues with my HM-01 but I have found about 1/2 engines I get from China need a valve job immediately or soon after I get them. Have you checked your valves to make sure they are sealing properly? Did you get your HM-01 preassembled or as a kit? I had to check the exhaust valve rocker clearance very carefully when I assembled mine, the first time I put it together I got it wrong and it wasn't closing the valve completely so there was compression but it was leaking.
Lastly, double check you are turning your engine the right way. I've spent 10 or 15 minutes being tired and getting frustrated with an engine before I remembered to check that I was turning it the right way.
Wow!!!!!!
Thank you for response!!!!!
I’m frustrated a little, I watched your video I just found as I suspected my timing is 180 off.
Your spark plug fires at TDC as exhaust rod is away from valve.
Mine fires just as exhaust valve is shutting with very little compression as on other stroke you can always feel more compression….
I’ll make quick video
@@fh64lucky yes, some of the ignition modules will fire when the contacts are moved (open to close OR closed to open) so if your contacts are too close together and remain closed for most of the cam movement, but open when the exhaust valve is opened the ignition may fire when they open instead of when they close.
I understand, but yours fires when rod is away from valve, I can’t see anything on mine that will make a spark at that position, spark/valve control all on 1 cam, it just seems my cam not machined right lobe timing, only thing it could be… odds are high on that though I guess.
You were right!!!!!!!
Thank you so much!!!!!!
It was a kit but contacts were all ready installed, they were to close as YOU said!!!!!
Had it running in 5 minutes!!!
Thank you again!!!!! Joe