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STIHL Hp ultra fail??? Or my fault??? #4673900
02/21/18 10:42 PM
02/21/18 10:42 PM
Joined: Feb 2018
Posts: 8
Australia
Matt2stroke Offline OP
Matt2stroke  Offline OP

Joined: Feb 2018
Posts: 8
Australia
Bought a brand new 2 stroke mower never been used. (Victa 2 stroke power torque) it says to use 25:1 or 50:1 using there victa formula semi synthetic oil (Valvoline made). I couldnít find any on shelf so I bought the STIHL go ultra and mixed it at 50:1. Iíve used the mower for 20hr and I thought Iíd have a look see on the exhaust port side of the cyclinder. Well I donít know if itís already scoring or if it was because I didnít run it in and itís just from the initial startup lubing from new. ( I got told I didnít have to run it in with fully synthetic at 25:1 just to stick to 50:1). It looks like 2-6 scratches on the cyclinder... I was wondering if itís because not enough or if I should just run STIHL ho ultra at 25:1 or even 32:1.. any input would help cheers Iíll link HD photos below..

Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673901
02/21/18 10:43 PM
02/21/18 10:43 PM
Joined: Feb 2018
Posts: 8
Australia
Matt2stroke Offline OP
Matt2stroke  Offline OP

Joined: Feb 2018
Posts: 8
Australia


Last edited by Matt2stroke; 02/21/18 10:44 PM.
Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673904
02/21/18 10:46 PM
02/21/18 10:46 PM
Joined: Apr 2017
Posts: 443
TN USA
Crispysea Offline
Crispysea  Offline

Joined: Apr 2017
Posts: 443
TN USA
I wouldnít worry too much about it. You could run it at 40:1 or 32:1 if youíre really worried about wear. I think 25:1 is overkill.

Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673910
02/21/18 11:03 PM
02/21/18 11:03 PM
Joined: Jul 2013
Posts: 1,870
Ottumwa, Iowa
jhellwig Offline
jhellwig  Offline

Joined: Jul 2013
Posts: 1,870
Ottumwa, Iowa
That isn't scored. The scratches are from carbon in that goofy shaped port. What do the rings look like?


Sparks fly from my fingers.

1995 Chevy K2500 Suburban lt 5.7
2014 Toyota Sienna
1983 Chevy K5 350
Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673915
02/21/18 11:09 PM
02/21/18 11:09 PM
Joined: Aug 2003
Posts: 460
Ga
Buzzsaw Offline
Buzzsaw  Offline

Joined: Aug 2003
Posts: 460
Ga
Stihl Ultra is only JASO FB. I'd run a FD rated oil at 32:1 to 25:1 if it were me. Your mower should be okay.

Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673922
02/21/18 11:21 PM
02/21/18 11:21 PM
Joined: Sep 2015
Posts: 6,175
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline

Joined: Sep 2015
Posts: 6,175
Kalifornia Kollective
I run all my 2-stroke power equipment at 40:1, or slightly richer. I use a 50:50 mixture of Motul 710 and Pennzoil TWC3. Have been doing this for close to 20 years. Most of my piston skirts will show an odd scratch here or there, but the engines run up to 10 years before re-ring.

I just tore down a Red-Max blower to re-ring. It was 20 years old run weekly for at least 2 hours w/o previous internal service. Looked fine with slight carbon cap. Cleaned right up.

Only motor I have lost in the last 30 years was one Homelite 46cc saw engine. A modern one with a CAT in the exhaust. I blame the CAT for too much heat retention. Have never seized a hot saw or a race saw on my mix. Others running much more expensive lubes have...

I have ancient outboards and Weedeaters, inexpensive Ryobi's, and expensive built Husqvarna's. They all get the same mixture. Set the timing right and the mixture, and keep a good air filter on it smile

2-strokes never die from too much oil. They will die from too little. But way more important is the mixture control. Slightly rich will live 100 years. Slightly lean will die in an hour ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673928
02/21/18 11:29 PM
02/21/18 11:29 PM
Joined: Nov 2017
Posts: 683
South Carolina
eyeofthetiger Offline
eyeofthetiger  Offline

Joined: Nov 2017
Posts: 683
South Carolina
I don't see the problem in the picture. It's good to run a bit more oil when breaking in a new engine, but I still run my old chainsaw and weed wacker around 25:1.


2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh
Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673942
02/21/18 11:43 PM
02/21/18 11:43 PM
Joined: Nov 2017
Posts: 511
North of you Idaho
KneeGrinder Offline
KneeGrinder  Offline

Joined: Nov 2017
Posts: 511
North of you Idaho
Originally Posted By: Matt2stroke
Bought a brand new 2 stroke mower never been used. (Victa 2 stroke power torque) it says to use 25:1 or 50:1 using there victa formula semi synthetic oil (Valvoline made). I couldnít find any on shelf so I bought the STIHL go ultra and mixed it at 50:1. Iíve used the mower for 20hr and I thought Iíd have a look see on the exhaust port side of the cyclinder. Well I donít know if itís already scoring or if it was because I didnít run it in and itís just from the initial startup lubing from new. ( I got told I didnít have to run it in with fully synthetic at 25:1 just to stick to 50:1).

"It looks like 2-6 scratches on the cyclinder..."

I was wondering if itís because not enough or if I should just run STIHL ho ultra at 25:1 or even 32:1.. any input would help cheers Iíll link HD photos below..




We are looking at the piston are we? I sure hope that's not your cylinder!

50:1 is proper ratio for Stihl Ultra. I use a lot of it. It is a good mix for a chain saw that pulls 14k rpm's, I doubt your mower pulls that kind of rpm, so your exhaust port looks very oil fouled for 20 hours run time. Your picture is shifted 90 degree's? And your exhaust port looks different on the right side which I believe is the floor of the port, just part of the design I guess.

The Scuff could very well be debris sucked in thru the air filter side, but it sure looks like you have enough lubrication in your fuel. Another possibility is not letting the engine warm completely before using, that can cause scuffing on 2 strokes.


08 Tribeca 86k PUP 5w30 wix
06 Accord Hybrid 134k PPHM 0w20 wix
02 Chevy k3500 99k Delvac 1 esp 5w40 wix
00 F350 136k Delvac 1300 15w40 wix
Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673946
02/21/18 11:50 PM
02/21/18 11:50 PM
Joined: Dec 2016
Posts: 8,021
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,021
Waco, TX
Light scratches.... definitely NOT scored.

Properly machined modern 2-strokes can all handle 50:1 without any issues.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: STIHL Hp ultra fail??? Or my fault??? [Re: Buzzsaw] #4673961
02/22/18 12:09 AM
02/22/18 12:09 AM
Joined: Feb 2018
Posts: 8
Australia
Matt2stroke Offline OP
Matt2stroke  Offline OP

Joined: Feb 2018
Posts: 8
Australia
Yeah I asked the guy at STIHL and he said STIHL didnít pay for the FD rating like they did with the STIHL Hp super because for how many people pay premium for the ultra wasnít worth it. There super is FD rated. ( not %100 sold on the truth of the matter) but it would make sense ultra would be better than super.

Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673962
02/22/18 12:12 AM
02/22/18 12:12 AM
Joined: Feb 2018
Posts: 8
Australia
Matt2stroke Offline OP
Matt2stroke  Offline OP

Joined: Feb 2018
Posts: 8
Australia
Photos of rings and upper cyclinder below

Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673967
02/22/18 12:14 AM
02/22/18 12:14 AM
Joined: Feb 2018
Posts: 8
Australia
Matt2stroke Offline OP
Matt2stroke  Offline OP

Joined: Feb 2018
Posts: 8
Australia

Re: STIHL Hp ultra fail??? Or my fault??? [Re: KneeGrinder] #4673968
02/22/18 12:15 AM
02/22/18 12:15 AM
Joined: Feb 2018
Posts: 8
Australia
Matt2stroke Offline OP
Matt2stroke  Offline OP

Joined: Feb 2018
Posts: 8
Australia
Oh yeah sorry the piston

Re: STIHL Hp ultra fail??? Or my fault??? [Re: Matt2stroke] #4673976
02/22/18 12:31 AM
02/22/18 12:31 AM
Joined: Dec 2006
Posts: 4,226
Port Orange, Florida
Panzerman Offline
Panzerman  Offline

Joined: Dec 2006
Posts: 4,226
Port Orange, Florida
New cylinders come with scratches. You even scratch them when you rebuild.
Nothing to worry about.
But richer is better than less oil. My last weed whacker, A Sears Craftsman was 25 years old. It didn't die just got hard to start. My wife bought me a new Echo but I ran 32:1 in it it's whole life and I run 32:1 in the echo too even though it says 50:1. Runs fine.

Last edited by Panzerman; 02/22/18 12:31 AM.


2006 Dodge Ram 2500 Hemi 4x4
2016 Dodge Challenger Scat Pack
Re: STIHL Hp ultra fail??? Or my fault??? [Re: Panzerman] #4673987
02/22/18 12:54 AM
02/22/18 12:54 AM
Joined: Feb 2018
Posts: 8
Australia
Matt2stroke Offline OP
Matt2stroke  Offline OP

Joined: Feb 2018
Posts: 8
Australia
Originally Posted By: Panzerman
New cylinders come with scratches. You even scratch them when you rebuild.
Nothing to worry about.
But richer is better than less oil. My last weed whacker, A Sears Craftsman was 25 years old. It didn't die just got hard to start. My wife bought me a new Echo but I ran 32:1 in it it's whole life and I run 32:1 in the echo too even though it says 50:1. Runs fine.



Yeah I might do what others say and go 40:1,32:1 just to be safe. I know STIHL ultra is good itís in my STIHL whippersnipper/weed whacker

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