Hutzl stihl 390 replacement engine question

[stihl_head1982]

View attachment 65555

Anyone ever fix coil holes
In the plastic case?

They make inserts. You may have to use a regular threaded screw but I've done it before with good results. Drill and tap for the insert -- use some super glue to set the insert with the allowed dry time. Then move forward.

 

[67L36Driver]

Try a piece of zip tie in the hole Cobey.

 

[BuckthornBonnie]

I had to use a zip tie on a backup saw. It works, but I can't speak to the longevity of the fix. 029 coil holes...

 

[fearofpavement]

Hmmm, I've worked on a lot of these saws and don't recall any of them ever having an issue with the coil holes. Think it's a case of them having been over torqued in the past?

 

[cobey]

Thanks all

 

[BuckthornBonnie]

Hmmm, I've worked on a lot of these saws and don't recall any of them ever having an issue with the coil holes. Think it's a case of them having been over torqued in the past?

Yes, or just many attempts at "fixes" over its life. The one I found it in had issues from day 1.

 

[Wood Doctor]

Yes, or just many attempts at "fixes" over its life. The one I found it in had issues from day 1.

Yes, could be an overtorqued wrench setting. Easy to do after a few beers. That's why when I work, the suds stay in the fridge.

 

[MustangMike]

That's why when I work, the suds stay in the fridge.

Ditto when hunting or cutting. I only came with 10 fingers and you don't get any replacements!

The Father & Sons in the cabin next to me were/are excellent hunters. Year after year they harvested some of the biggest bucks on the mtn. But the suds used to go out with them. About a decade ago, one of the boys mistook another hunter for a Bear. Things will never be the same, the other hunter was from one of the other groups up on the mtn. I can't help but think that the suds were a contributing factor. I can not imagine the pain suffered by both groups.

Sage advice WD!

 

[cobey]

Well more case issues....
Got a case coming from
My buddy Chad

 

[BuckthornBonnie]

Well more case issues....
Got a case coming from
My buddy Chad

What was wrong?

 

[cobey]

What was wrong?

The standoffs for the coil are cracked
A I don't want to have the coil losen/fall off I think it has happened before

 

[BuckthornBonnie]

The standoffs for the coil are cracked
A I don't want to have the coil losen/fall off I think it has happened before

Gotcha.

 

[cobey]

Some pics of my thread repair
It was an 832 screw insert, I had to snap
The screw ears off the top, I drilled
The hole .230 the insert was .250
I think the hole needs to be .240 ish
The insert tops break easy. I got 3/4
Of the insert in and ground it
Flat to the case. I installed them by screwing a screwing inside the
Insert and screwing it in. Again they are brittle but once installed work well.
It takes work to get the coil set correctly

 

[cobey]

Gotcha.

Btw there was a hair on the case I thought was a crack

 

[cobey]

I had another case and threads were bad
On one coil screw. I'm gonna fix it too

 

[cobey]

I had to put thin washers behind the pump so it didn't bind. I spun it by hand and it pumps oil

 

[cobey]

I won't ever put a hutzl
Motor in a saw I would keep.
Next time I will find used oem
Parts. Even with hutzl success
Stories, when people search
"Hutzl " they know the quality
Isn't the same as original equipment
Makes it harder to sell with aftermarket
Parts

 

[Terry Syd]

It takes work to get the coil set correctly

I elongated the slots on the coil and then removed the threads from the top part of the screws so I had an 'adjustable coil'. It gives me about 4 degrees of movement. It makes it easier to dial in the ignition timing. Just set the coil to full advance, test, and then start filing the flywheel key. Take off a bit, test it, take off a bit more, test again - when you go too far, just move the coil back to the sweet spot.

This series of saws has a factory tolerance of between 23.5 degrees and 28.5 degrees due to manufacturing tolerances, that is a lot of slop in manufacturing.

 

[cobey]

I elongated the slots on the coil and then removed the threads from the top part of the screws so I had an 'adjustable coil'. It gives me about 4 degrees of movement. It makes it easier to dial in the ignition timing. Just set the coil to full advance, test, and then start filing the flywheel key. Take off a bit, test it, take off a bit more, test again - when you go too far, just move the coil back to the sweet spot.

This series of saws has a factory tolerance of between 23.5 degrees and 28.5 degrees due to manufacturing tolerances, that is a lot of slop in manufacturing.

The 8/32 screws I used give it lots of room to adjust . Thanks for the info
I advanced it about 1/2 key

 

[MustangMike]

The guy that has the 029 I converted to a 390 w/Huztl P&C loves it, and he would not have paid the price for OEM parts, so as long as you are honest with your customer, the rest of it is knowing your customer.