The new stihl 662 4 mix

[Deleted member 83629]

I would not jump to that conclusion as the only 4 mix stuff is currently available is clamshell two valve with stems parallel to the bore. For all the 450 moto x stuff in this thread the bore/stroke is about similar with my ht131.

i had a br600 it swallowed valves the fs 90 needed yearly valve adjustment timing belts did break in them and they were to heavy.
i will stick with husqvarna or echo hand held equipment.

 

[big t double]

timing belts did break

4 mix engines don't use timing belts...but I agree ive seen a few trash motors due to dropped valves

 

[Franny K]

I have had an Efco Honda engined device go from vroom to vzzzz in the first minute out of the box. I spent a few minutes looking for valve keepers and eventually figured out what they were using. I was able to put the keeper on but it spits out the intake a bit. I would hope the 662 Stihl 4mix product has a more conventional keeper set up.

 

[ANewSawyer]

4 mix engines don't use timing belts...but I agree ive seen a few trash motors due to dropped valves

I thought that 4 mix engines did use timing belts? The one thing I hate about Stihl is I can't google an IPL to confirm/deny this.

 

[ANewSawyer]

Actually, I found a IPL by googling. http://www.motoculture-jean.fr/upload/pdf/FS130_FS130R.pdf

 

[big t double]

Nope. Cam drivin off the crank. No belts. I've seen the insides of plenty of 4mix motors. Matter of fact I can take a pic tomorrow when I get to work if you'd like...got one in last week that lost a crank bearing. Getting a short block under warranty.

 

[ANewSawyer]

Yah, my bad. I found that IPL right after I posted. Sorry!!!!!!

But, seriously, is the 662 really going to be 4 mix? I can't find out if it is a real model or not.

 

[Franny K]

This isn't the video I was searching for but it clearly shows push rods and rocker arms.

 

[ANewSawyer]

Oh and I find it funny that Stihl's pro weedeaters use a clamshell design. Not that I have a problem with clamshells. But I wonder how many guys on here who won't touch a clamshell saw are happily using a 90/110/130. Lol.

 

[bwalker]

Oh and I find it funny that Stihl's pro weedeaters use a clamshell design. Not that I have a problem with clamshells. But I wonder how many guys on here who won't touch a clamshell saw are happily using a 90/110/130. Lol.

I don't think it's the clam she'll that's looked down on per se. It's the fact that cheap saws are made with plastic and sheet metal clamshells.
Of course the four mix has a plastic cam, which is even worse than plastic and sheet metal crank cases.

 

[ANewSawyer]

Hmmmm. Wonder how much a spare cam runs?

 

[big t double]

Of course the four mix has a plastic cam, which is even worse than plastic and sheet metal crank cases.

I have never seen a cam fail in a 4mix...and I've seen my fair share of 4mix engine failures.

Hmmmm. Wonder how much a spare cam runs?

Cheap...they're plastic

 

[hseII]

Oh and I find it funny that Stihl's pro weedeaters use a clamshell design. Not that I have a problem with clamshells. But I wonder how many guys on here who won't touch a clamshell saw are happily using a 90/110/130. Lol.

FS250 FTW

 

[HuskStihl]

Come on Ben ,sign of the times ,i got forced to ride 4 stroke back in 2005 ,that was 10 years ago now ,the 2 smokes are extinct now ,time to step up and adjust some valves .

Nobody gives a **** about what kind of moped you ride, junk man!

 

[ANewSawyer]

I have never seen a cam fail in a 4mix...and I've seen my fair share of 4mix engine failures.

You've seen a lot of 4mix failures? What are the most common failures that you see?

 

[big t double]

crank bearings..usually the fan side. valve retainer clips will let loose and drop and valve, this usually destroys the engine. seen a few drop a seat. none of these are terribly common but do happen. if valves don't get adjusted eventually rockers will pop off the push rods...

 

[redtractor]

Of course the four mix has a plastic cam, which is even worse than plastic and sheet metal crank cases.

I remember a training class for Toro where they were talking up their "Toro made" (Chinese) push mower engine. Their selling point was that the plastic cam wouldn't introduce metal contamination, thereby promising longer engine life! Uh huh. That's why they did that. Right.

 

[big t double]

I remember a training class for Toro where they were talking up their "Toro made" (Chinese) push mower engine. Their selling point was that the plastic cam wouldn't introduce metal contamination, thereby promising longer engine life! Uh huh. That's why they did that. Right.

have you seen many "toro" engine failures? just curious...they haven't been a terrible motor in my opinion...other than really sensitive to poor fuel quality. honestly id rather have one of those engines in a snow blower than that junk techumseh they were using.

 

[redtractor]

I've no doubt that the Toro engines will last long enough for a homeowner to feel he got his money's worth. What made us roll our eyes was the claim that they went to plastic to improve the quality of the product.

 

[Deleted member 83629]

plastic camshaft wasn't toro's only problem they also ran lawn boy in the ground also.