Stihl 046 Magnum hard starting

[SawMekanic]

Got me another 1128 400 1312 coil , and it still snatches the cord out of my hand sometimes , im so stumped

Checked flywheel key ( poly type ) , decarboned piston & cylinder , replaced coil

 

[burnses]

well I've read most of the posts about the running issue and I'm not sure what is up but you might try changing the coil gap if you can possibly a larger gap to make the coil less sensitive to the magnet pulse...might have to elongate the holes a bit. Got any bearing play that would change the coil gap while pulling on the cord?

good luck
sapcan

 

[SawMekanic]

Ive tried testing the coil gap bigger with no difference , and the crank bearing is tight as Hillarys gap...

I can pull it 5 times , and out of those 5 it might snatch once , then maybe not ... as it may fire up. Then after warm , it only takes 1 pull to start , but might snatch cord , or it might not. Its very frustrating , so i grip it hard as i can hoping it dont tear my fingers off. Its like playing russian roulette.

Im about to chuck it into the pond and replace with a Husky

 

[bossind]

Ive tried testing the coil gap bigger with no difference , and the crank bearing is tight as Hillarys gap...

I can pull it 5 times , and out of those 5 it might snatch once , then maybe not ... as it may fire up. Then after warm , it only takes 1 pull to start , but might snatch cord , or it might not. Its very frustrating , so i grip it hard as i can hoping it dont tear my fingers off. Its like playing russian roulette.

Im about to chuck it into the pond and replace with a Husky

Any luck yet?

 

[Millerhill520]

Hey,

I have 3 064's, and one of them does the same thing, but I know why. 064's had 3 or maybe even 4 different coil offerings over its life. I ended up building my last one and had to use one of those universal stihl coils, the default one for the 440/460 etc.... when I put it together, it would nearly take your arm off starting it. It ended up being timing. Of course, the 064 had some different flywheels and had timing differences, even one flywheel had 2 different key ways on it. Well, long story short, I notched the coil mounting holes to adjust the timing a bit, and wholla, it worked like a charm.

I have also notched a 460 coil to adjust the timing a hair when doing a m.m and opening up ports a little. Timing adjustments are common mod on these models. So, if you haven't owned your saw since new, check at me see if the coil had the holes opened a little, or may be sitting off of the mounting holes very slightly. While your in there, check the timing anyway and make sure it's firing at the right position. My problem with the 064 was something that took a ton of research on my microfiche and factory stihl sheets, but it is worth mentioning to you on your 046.

Carbon in the top of piston could possibly cause it due to some higher compression, but that piston would have to have a lot of carbon on the top to do that. Timing ignition issue is my guess.