Port Timing

[PhillH]

Hi all,

 

Looking for some help, I am rebuilding a MS440 and will replace piston and cylinder.

Whist waiting for parts to be delivered I have been doing some googling about port timing and would like to check mine when i get that far.

 

Does anyone have any instructions or recommend a good youtube video? maybe a video one someone from here has put together?

 

Thank you

Phill.

[spudulike]

What is the reason to know the duration and opening timings of your saw? TBH, you will need a timing wheel, a method of fixing it to your saw, a pointer and then there are a number of ways that the durations can be expressed so you will need to get your head round those if comparing them.

A little knowledge can sometimes be dangerous!

[PhillH]

What is the reason to know the duration and opening timings of your saw? TBH, you will need a timing wheel, a method of fixing it to your saw, a pointer and then there are a number of ways that the durations can be expressed so you will need to get your head round those if comparing them.
A little knowledge can sometimes be dangerous!

Hi Spud,
I had a idea you would comment as this is right up your street. I am not into porting it anything like that. It is more out of curiosity to see that everything is as it should be. Engineering is not a problem as I am a turner/fitter by trade and have easy access to a good old Colchester triumph.

I have no intention of changing anything unless something jumps out and then I will be straight back to you for advice.

It is also good to know for in the future too if there ever was a problem.

I will continue to search google in the mean time.

Thanks, Phill.

[spudulike]

A bit extreme, the beauty of the two stroke is set port timing, very few moving parts and complexity compared to a four stroke engine.

But - go ahead and I guess most of us have 6 weeks + of being locked up so plenty of time to fiddle....good luck!

[PhillH]

A bit extreme, the beauty of the two stroke is set port timing, very few moving parts and complexity compared to a four stroke engine.
But - go ahead and I guess most of us have 6 weeks + of being locked up so plenty of time to fiddle....good luck!

Cheers Spud,
If you think it is over the top then I won’t bother.
Yes there is some use to this lock down.

Thanks again, Phill.

[jmac]

Check out the ironhorse on YouTube, he does some videos explaining port mapping. I thought he explained it well.

[PhillH]

Check out the ironhorse on YouTube, he does some videos explaining port mapping. I thought he explained it well.

Cheers Jmac, I will take a look

[CutterSy]

There are loads of videos on how to do it. Tree Monkey does a good one if I remember. It’s easy to do, but everyone has slightly different methods, so can’t always count on comparing numbers to what others have.

[PhillH]

There are loads of videos on how to do it. Tree Monkey does a good one if I remember. It’s easy to do, but everyone has slightly different methods, so can’t always count on comparing numbers to what others have.

Thanks CutterSy, I will take a look.

I am curious more than anything.

[jmac]

6 hours ago, CutterSy said:

There are loads of videos on how to do it. Tree Monkey does a good one if I remember. It’s easy to do, but everyone has slightly different methods, so can’t always count on comparing numbers to what others have.

Aye he is good, more in depth porting than ironhorse.