Adjustable ignition timing
- Thread starter Creative Engineering
- Start date
I need help i changed the clutch pads on my bike motor now the bike will not start i have spark i was wondering if there is a way to set timing. 49cc
If all you did was replace the clutch pads, why would you think you need to adjust the timing?
In answer to your question the answer basicly is no. The timing is fixed. The stock magneto rotor doesn't have any adjustment.
so if theres no way to time it then do you have a answer for why my bike wont run i get a backfire when i try and start it
It sounds like i am your next door neighbor, because i just bought a pk80 and it is a pooch.
Hey Biknut, can you verify this, please?
It seems that the crank turns clockwise? and if you turn the magnet counter clockwise wouldn't that retard the timing? Just asking?
(Some of Jim's pictures at the beginning of this topic it looks like the magnet was turned clockwise?)
With that being said....
I took my key out and moved the magnet counterclockwise on the crank, about the width of the key-way, and it did make a noticeable difference!! I just don't know if I advanced or retarded it.
Thanks
Replace the Magnitogorsk and it will run.... Lol... It ain't a car so don't **** with the timing
I concur with CCC about not messing with the timing! All air cooled engines need to have the timing way retarded to keep the engine from running too hot.
I'm very curious to try adjusting the timing on my Pig, anyone still making the adjustable magnet?
It is very confusing, but that's correct. Looking at the rotor, the motor turns clockwise. Adjusting the rotor counter clockwise advances the timing. It's counter intuitive.
The warning is valid though. There's great danger of burning your motor up if you go too far, and too far is very little adjustment.
Hey Bikenut and gokart25 --
I don't get it. If your rotor magnet is spinning clockwise it seems obvious that turning it several degrees in a clockwise direction would be ADVANCING the timing of the spark (as shown by Jim's pictures on page 1 of this thread). How can moving the rotor magnet counterclockwise be doing anything but RETARDING the spark timing? I hope someone out there can clearly explain that mystery to me.
In the meantime I am going to experiment with the magnet position by first removing the keyfrom the keyway, then turning the magnet slightly clockwise from its original position, then tightening it down firmly using a star nut (hopefully it won't slip) and see if it is better. After that I will move it slightly counterclockwise from its original position and check the result. I will then report my findings on this thread.
I don't get it. If your rotor magnet is spinning clockwise it seems obvious that turning it several degrees in a clockwise direction would be ADVANCING the timing of the spark (as shown by Jim's pictures on page 1 of this thread). How can moving the rotor magnet counterclockwise be doing anything but RETARDING the spark timing? I hope someone out there can clearly explain that mystery to me.
In the meantime I am going to experiment with the magnet position by first removing the keyfrom the keyway, then turning the magnet slightly clockwise from its original position, then tightening it down firmly using a star nut (hopefully it won't slip) and see if it is better. After that I will move it slightly counterclockwise from its original position and check the result. I will then report my findings on this thread.
LOL
Go ahead and try what you're planning. That's exactly the same thing I did, because I thought exactly like you. It won't hurt anything, and it's the best way to learn. It'll be obvious to you right away, that your motor is running real doggie. Then turning the rotor the other way will seen even better, because it will feel real powwaful in comparison.
This is the short explaination. Turning the rotor clockwise advances the rotor, but retards the crankshaft. Turning the rotor counterclockwise retards the rotor, but advances the crankshaft. What we're really wanting to do is advance the crankshaft when the ignition fires.
Don't over do it. Jim recommended 1/2 a keyway. I went about 1 keyway but tried to error on the less side.
Jermak I questioned it myself..
biknut
This is a good explanation:
This is the short explaination. Turning the rotor clockwise advances the rotor, but retards the crankshaft. Turning the rotor counterclockwise retards the rotor, but advances the crankshaft. What we're really wanting to do is advance the crankshaft when the ignition fires
biknut
This is a good explanation:
This is the short explaination. Turning the rotor clockwise advances the rotor, but retards the crankshaft. Turning the rotor counterclockwise retards the rotor, but advances the crankshaft. What we're really wanting to do is advance the crankshaft when the ignition fires
Yes, BUT, if you are running an expansion chamber, sometimes advancing the timing
is not a good thing. One size ( one timing setting) does NOT fit all.
( also the intake length,the compression ratio,the gearing, the mixture ratio, and probably a few other things I missed all play into the final timing setting)
It is a "Holistic Horsepower" kind of thing...
is not a good thing. One size ( one timing setting) does NOT fit all.
( also the intake length,the compression ratio,the gearing, the mixture ratio, and probably a few other things I missed all play into the final timing setting)
It is a "Holistic Horsepower" kind of thing...
I'm not too bright on this subject, still in the noob ranks... when it comes to the spark, how many milliseconds are we talking as far as advancing/retarding the sequence? i was going to suggest a small time delay fuse if they made one in the time range that was needed....
I bought an angled key for my Briggs its a 4 degree advance. Or retard depending which way you install it. The advance to my timing was noticeable