Saw builds

[jmssaws]

Mine has a different disposition on different days.

Maybe you personalized the build for me.

I had to retard the flywheel 015 to get it where it won't get you everytime.
It's just once in awhile now.

It's the same timing as your saw and when you get the exhaust down that far it gets cantankerous.

 

[jmssaws]

015 didn't help much
It's at 030 retarded now and still acts like to much timing.
I'm scratching my head

 

[Chainsaw Jim]

015 didn't help much
It's at 030 retarded now and still acts like to much timing.
I'm scratching my head

What's the squish set at?

 

[jmssaws]

What's the squish set at?

018 185lb a little bit warm

 

[jmssaws]

The other saw has 040 advance and the same flywheel and coil and the same compression.

015 retarded it will still hit when trying to get the piston up to Tdc.
It's the craziest thing I've seen

 

[TreeLife]

Polarity of the magnet change?

 

[jmssaws]

Polarity of the magnet change?

Ive not changed the flywheel but have everything else.
It runs great just a *b-word to start

 

[jmssaws]

Found my problem.
Both are stamped 1201a

 

[jmssaws]

Cleaned it up and noticed someone had the same problem before and scratched 03 above 01a
I didn't see it until a minute ago

 

[X 66 stang347 X]

So would you have to have a coil to match? The 1201 supersedes to 1203

 

[jmssaws]

So would you have to have a coil to match? The 1201 supersedes to 1203

1203 is a limited flywheel.
It's been running this whole time about 4 keys advanced.
I'm surprised it ran at all,it runs much better now.

 

[Brewz]

Pulled down the MS880 I am about to port and found a nasty restrictive intake.

100/122/66 and about .040 squish

Question: What is the purpose of the little hole in the bottom of the intake?
I plan to get it to about 102/122/78 so good chance I'm going to get down into the hole.
I plan to open the intake right out properly anyway so if there is any of the hole remaining I will just fill it.

The transfer tunnels are really narrow as well, like half the size of an 064 cylinder

 

[Deets066]

Check your intake boot, no sense making the intake neck way larger than the boot

 

[Deets066]

coil and carb with need some attention too

 

[mdavlee]

Pulled down the MS880 I am about to port and found a nasty restrictive intake.

100/122/66 and about .040 squish

Question: What is the purpose of the little hole in the bottom of the intake?
I plan to get it to about 102/122/78 so good chance I'm going to get down into the hole.
I plan to open the intake right out properly anyway so if there is any of the hole remaining I will just fill it.

The transfer tunnels are really narrow as well, like half the size of an 064 cylinder

View attachment 65632

View attachment 65633

Probably to prevent fuel pooling

 

[Chainsaw Jim]

There's nothing restrictive about that intake unless you're putting something like a Tillotson HD on it.

I'm just gonna play imagination land on the little hole and say it's a vent to keep spitback fuel from puddling. I've never heard mention of it in all my days of not working on 880's. lol

 

[mdavlee]

I've never seen that hole in the 5 88 cylinders I've seen.

 

[Brewz]

coil and carb with need some attention too

Carb will get the limiters removed.

Coil..... are they limited?

 

[Brewz]

I've never seen that hole in the 5 88 cylinders I've seen.

Its a 6 month old MS880

 

[mdavlee]

Its a 6 month old MS880

I've not worked on a stainless muffler version