Stihl bg85 coil or carb problem?

[daveindales]

Ok, my 15 year old blower suddenly stopped today. Thought it was out of petrol, and it was. However, it suddenly stopped, not coughed and spluttered a bit before stopping, like things usually do. just stopped.

 

Filled her up with juice and she won't start. Plenty of compression, I don't think it's a piston problem. Taken carb apart and cleaned with carb cleaner. All looked ok. Plenty of fuel in primer build, so fuel is getting to carb.

 

Have put a bit of petrol down cylinder and she makes an attempt to fire, but won't start. So it seems to me that petrol isn't getting to cylinder. I checked the spark with a couple of plugs, (grounding on cylinder) and I thought the spark seemed very weak with both plugs. Gap to coil seems ok.

 

Anyone any ideas?

[MATTMOSS]

I would concentrate on the apparent lack of fuel getting to the cylinder.

If it sparks and tries to start with petrol put in cylinder i would look at that issue first and assume the spark is fine.

Have you another carb you can try?

[daveindales]

No carb, but only £20 on ebay

[MATTMOSS]

Just seems suspicious that the issue has started after running out of fuel to think the coil could be at fault?

I would think carefully before getting dragged into spending money on a 15 year old blower trying to get it sorted, maybe its time to treat yourself?

I would guess on the carb but engine could be tired also, has it good compression?

[MATTMOSS]

Sorry you said it seems ok in the First post.

I would check and double check the carb and gaskets, maybe take exhaust off and have a look at the piston.

Prob worth £20 to try a carb.

[daveindales]

Think it's worth a carb, but was just wanting others opinions first, before I buy one

[MATTMOSS]

Check fuel pipe and filter.

Hope you get it sorted.