MS880 with MS361 coil

[Brewz]

Hi folks.
I have ported a 6 month old MS880 for a friend, fitted a larger 088 intake boot and a larger Tillotson HT12 carb.

With the stock coil the saw ran well but just sat there bouncing of the coils limiter.

@Mastermind suggested fitting an unlimited 361 coil which I have just done and now she runs like a sick dog.

I figure it's a timing issue but am unsure which way to go.

It is really sluggish off idle like a bad rich bog and runs really rough, sounds like an old diesel with the headers off.

I'm think it's way retarded as it starts really easy.

Has anyone done this mod before?
Any idea on how much che may need to be moved?

 

[Homemade]

I have no clue on ignition timing, but possible bad coil? Although I'm sure you've checked already.


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[spencerpaving]

I would advance it

 

[Brewz]

I really need to get a timing light

 

[Mastermind]

Did you use an aftermarket coil?

 

[Brewz]

No mate
OEM
Removed this:



Installed this:

 

[Mastermind]

Carl Miller tried a few AM 361 coils. None worked.....but the OEM coil worked well.

 

[Fruecrue]

Are the 880 and 361 flywheels a different outside diameter? Just wondering if the magnets / keyway would be positioned differently due to smaller circumference, or any other reason.
If anyone had the two to compare that might tell something, if they are X degrees off, that may be a starting point to find a position that works.
Or maybe I'm way off?

 

[jb-chainsaws]

I'd be tempted to advance it a few degrees at a time without a timing light, it can only get better surely! And should get you somewhere near. If it works you may just be onto something!!

 

[Brewz]

Just advanced it a 1/4 key and it ran a touch better.
Gave it a full key and it came to life.
Throttle lag is gone, sounds crisp, stopped blowing smoke.

Happy

4 strokes strong at 13300 rpm

 

[Brewz]

I marked the keyway with a black marker

I knew it was better when I needed to use the decomp to start it

 

[jb-chainsaws]

Awesome work!! You gonna take it any further with the advance or are you happy at that?

 

[Brewz]

It's a finger snapper without the decomp so it will run as is

 

[ferris]

Video from the Little Beats?

 

[Brewz]

Well it started easy enough warm when I was setting it but I cant crank it cold.
It just snaps the decomp shut and near breaks my fingers every time.

Going to have to play with the timing some more to get it right.

 

[ferris]

Maybe to much advance

 

[Brewz]

Maybe to much advance

Haha, yeah that's the general thought mate.

 

[jb-chainsaws]

Haha, yeah that's the general thought mate.

Maybe just man the hell up?

Just kidding, what he said ^

 

[hseII]

It's a finger snapper without the decomp so it will run as is

View attachment 71889

I'm Sposed to have one of dem der dinger snatcher 1124s.

I believe Santa Clause's delivery company will deliver tomorrow. [emoji38][emoji38]

 

[ferris]

Some news Here?