Husq k970 compression, spark, won’t start

[ZackW]

Hi everyone, I’m new here. I looking for some help with a k970 concrete saw. Bought it not running as a project. It has 130 psi compression (4 pulls), has spark, but won’t fire up. I took apart the RWJ-7 carb and cleaned/new seals with no change. It has a new bpmr7a spark plug. I pulled the flywheel to check the woodrift key, which looks fine. The magnets on the flywheel appear to be passing the magneto at top dead center. I’ve taken off the exhaust, which appears to be clear, and the cylinder/piston looks fine. I’ve sprayed starting fluid into the cylinder, still won’t fire. Looking for any other pointers or experience with these saw that could lead to getting this thing running.

Thanks, Zack

 

[ZackW]

I have both L and H screws set at 1.5 turns

 

[srcarr52]

After you pull it over many times is there raw fuel on the plug?

 

[Duce]

Flywheel to coil gap correct? Air filter clean?

 

[ZackW]

Flywheel to coil gap correct? Air filter clean?

Do you happen to know the correct gap? I’ll gap it

 

[ZackW]

After you pull it over many times is there raw fuel on the plug?

I’ll try it again this evening. I’ve sprayed starting fluid in it the couple different times I’ve tried so it’s been tough to tell us it’s from the carb or from the spray.

 

[Duce]

Do you happen to know the correct gap? I’ll gap it

I use Husqvarna air gap tool 0.3mm or a business card will work.

 

[Duce]

Make sure grounding parts of coil and case are clean.

 

[ZackW]

Make sure grounding parts of coil and case are clean.

I clean the parts, and gapped it to .3mm, now it’s backfiring but still not starting

 

[cus_deluxe]

the only one of those i ever worked on needed an impulse line, behaved just like yours

 

[ZackW]

I replaced the coil, it now runs good. Apparently it was getting spark but not enough under compression