Air filter upgrade

[cgarman]

Hey Guys:

After fighting with my new (old) 076 for milling, I bought a FOP filing guide (Thanks BobL) and took the rakers back to where they're supposed to be. Funny how the old plate guide tells me everything is fine, when the FOP takes off another 0.020". At least I'm making chips again.

With the increased bite now, I noticed the saw bogging down for the first time. I pulled the air filter to try a few inches, and the saw runs like it should. Diagnosis: filter filthy. It came with the saw, and is likely caked with 30 years of oil and dust. I brushed it off, but didn't get anywhere. I soaked it in sopay water overnight, so hopefully that will help.

Since I'll eventually have a problem finding these filters, I thought about getting an upgrade kit, except it looks like they don't exist. Anybody found one for the 076? My buddy upgraded his Dolmar 7900 and it made a huge difference.

Option B is to try and build one myself. Anybody tried this? I figure if I get a small automotive K&N round filter, they just clamp on a round tube. I can make a plate that fits over the filter housing with a gasket, and come off of it with a tube to mate with the filter. Sounds easy, but I haven't tried it.

Anybody been there? Anybody with an 076 who wants to help me figure it out?

 

[820wards]

Anybody been there? Anybody with an 076 who wants to help me figure it out?[/QUOTE]



cgrman,

Don't have a 074, but do have 134cc motor on my mill. I used a K&N filter as you described on my mill and after running it a few times, found that the filter was not keeping the very fine sawdust from getting into the carb. So I went down to our local lawnmower shop and found out that Stihl makes a secondary filter that slips over their existing round filters for their weed wackers. It was larder in diameter that the K&N so I had my wife the sewer cut it down and re-sew it to make it fit the filter.

With that don I bought a kit from K&N that has a spray they recommend for off-road filter use. I spray it on prior to milling and can run all day with no problems at all, and with a 134cc motor it needs good air flow.

Here is the K&N Filter with the Stihl filter. It looks as though it's made from some sort of felt material. It has elastic where it's joined together so it will fit tight around the K&N.

Part number. I think I paid about $8.00 for the filter.

Installed filters

When I was cleaning the mill from the last time out I took the K&N filter off to inspect the bore of the carb. and there was zero dust.

This works for me.
jerry-

 

[BobL]

Hey Guys:

After fighting with my new (old) 076 for milling, I bought a FOP filing guide (Thanks BobL) and took the rakers back to where they're supposed to be. Funny how the old plate guide tells me everything is fine, when the FOP takes off another 0.020". At least I'm making chips again.

With the increased bite now, I noticed the saw bogging down for the first time. I pulled the air filter to try a few inches, and the saw runs like it should. Diagnosis: filter filthy. It came with the saw, and is likely caked with 30 years of oil and dust. I brushed it off, but didn't get anywhere. I soaked it in sopay water overnight, so hopefully that will help.

You need to be careful running the saw without an air filter even for a few inches as the saw could be running too lean and you could seize the engine.

It could be the filter is clocked with lube that has polymerized and gone hard. Try soaking overnight and washing the filter in raw gas in a clear glass container and look for a dusty residue, repeat with fresh gas until no more residue come off. If the filter was blocked the saw will be running rich and the plug will be black and rpms will not reach the carby governor. It sounds like you need a tacho to check the setting of the H screw.

Usually 076 filters lose their flocking material and become more open over its lifetime rather than blocked. When the filter is working properly the H screw can be adjusted so the saw will hit the rpm (carby governor) limit of 9000 rpm and there is more than enough air coming through. Rather than an air filter mod the 076 would almost certainly be limited by its exhaust so a muffler mod will be more beneficial to the saw than a filter mod.

 

[jnl502]

i have a old stihl 510 i think it has a raised top and uses a large round filter and pre filter the 051 and 076 saws are near the same u might could use the top of the 510 cut off saw to use and it should filter very good but with a larger filter u would need the muff mod to make use of the extra air and the saw would make noticeable power gain pm me if u want some pict.
jnl

 

[Trever]

i have a old stihl 510 i think it has a raised top and uses a large round filter and pre filter the 051 and 076 saws are near the same u might could use the top of the 510 cut off saw to use and it should filter very good but with a larger filter u would need the muff mod to make use of the extra air and the saw would make noticeable power gain pm me if u want some pict.
jnl

+1. I have a 075 that is getting the TS 760 air filter system (inner filter, pre filter, and filter). The TS 510 and TS 760 will work on all 050,051,075, and 076 saws. Also plan on updating my 075 with the newer 076/ TS 760 starter cover. I hope this helps. Have a blessed day.

 

[cgarman]

I'm having a hard time understanding how the TS760 (can style) filter will fit on top of my 076 (flat filter). I found some TS760 filters online, and there's no way it would mate with my 076. Is there an adapter I'm missing?

 

[BlueRider]

for the TS760 air filter conversion you will also need an air filter box from a TS760. this is the metal filter cover and the plate that mounts on top of the carb. you will also need the rubber gaskets as well as the studs and bolts to hold it closed. to buy all the parts from a dealer would likely cost too much $$ but you can often find a trashed TS760 for $25 there will be very few usable parts other than the filter box as these saws get trashed by sucking concrete dust through the engine. ask your dealer if he has a filter box off of one he will sell you on the cheap, or to keep an eye out for one for you.

Jerry's K&N set up is nice and I have had the privlidge of seeing it in person, but trying to mount it on an 075 will require some fancy foot work. There is nothing to clamp the fliter to and on the 075 the bottom filter plate holds the carb onto the intake as well as the mount for the kill switch. any mounting adapter will have to incorperate the stock bottom filter plate.

Stihl has a confusing nomenclature for their different filters. one is a white fuzzy filter that I think they refer to as flocked, this is their older style filter. The other is a yellow paper looking material that I think they refer to as mesh. the yellow filters are quite rugged and breathe much better then the older style and they are still available from the dealer. I always keep a spare with me and sice I have two saws that use the same filter that gives me a total of three.

 

[cgarman]

I think I have the flocked one. It's white, and looks like one of those hard plastic kitchen scrubber pads. It has "Stihl" printed all over it, except where 30 years of dust and oil are caked on.

Just tried to order a new one from Bailey's, but they're on backorder.

 

[820wards]

It could be the filter is clocked with lube that has polymerized and gone hard. Try soaking overnight and washing the filter in raw gas in a clear glass container and look for a dusty residue, repeat with fresh gas until no more residue come off. If the filter was blocked the saw will be running rich and the plug will be black and rpms will not reach the carby governor. It sounds like you need a tacho to check the setting of the H screw.


Bob is right on about cleaning the filter. I forgot to tell you that I take the filter off my motor and wash it thoroughly to get the K&N filter treatment off both pieces. I then let it dry before I spray new filter treatment on both filters.

So Bob, did you bring back any ash with you? I still have some from when Mt. St. Helen's erupted back in 79 or 80. I was up there at a Trans Am race when it popped the second time.

jerry-

 

[BobL]

It could be the filter is clocked with lube that has polymerized and gone hard. Try soaking overnight and washing the filter in raw gas in a clear glass container and look for a dusty residue, repeat with fresh gas until no more residue come off. If the filter was blocked the saw will be running rich and the plug will be black and rpms will not reach the carby governor. It sounds like you need a tacho to check the setting of the H screw.


Bob is right on about cleaning the filter. I forgot to tell you that I take the filter off my motor and wash it thoroughly to get the K&N filter treatment off both pieces. I then let it dry before I spray new filter treatment on both filters.

So Bob, did you bring back any ash with you? I still have some from when Mt. St. Helen's erupted back in 79 or 80. I was up there at a Trans Am race when it popped the second time.

jerry-

I'm still in Europe. I saw the ash covering the hire car I picked up in Rome. I will post something woody once I get organzised.

 

[jnl502]

I think I have the flocked one. It's white, and looks like one of those hard plastic kitchen scrubber pads. It has "Stihl" printed all over it, except where 30 years of dust and oil are caked on.

Just tried to order a new one from Bailey's, but they're on backorder.

did u get the pictures i sent of the 510 air filter setup? or do need some better ones?
jnl