It does not damage modern auto engines, as they have materials suitable for it. I have personally never had a fuel-related problem in any of my vehicles, and I typically keep them for 250000 miles or more. They would run longer but the upholstery wears out, and I prefer not to get poked in the butt with springs!
Possible new bad gas. What should I do?
- Thread starter ace4059
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My first chain saw was a Remington. It would vapor lock any time I tried to use it in warm weather. The fuel tank was part of the same casting as the engine block; there was no air gap between the engine and the fuel tank. It just got too hot in the summer; the gas actually boiled in the tank. (I could even hear it boiling when the saw stalled due to vapor lock.)
I like Red Armor 40:1. It looks dark like off road diesel. Easy to see if you have the correct mix when you pour.
Not from lack of looking.
He posted some already, I don't see a problem. Go back and tell me. I'm thinking he is good to go, I am pretty sure it was vapor locking that day.
Ok seen pics…exhaust side looks great however the intake looks like it need looked at…which mean you would have to take all the air filter assembly and such off..
Take this with a grain of salt but I have seen pistons look great on one side and be ruined on the other….
Take this with a grain of salt but I have seen pistons look great on one side and be ruined on the other….
Here was the pic of the MS 400 cylinder looking through the exhaust port This was after running RA 50:1 for about 5 minutes. Notice how it cleaned the cylinder wall up. The scratch looks deep on the picture but it’s not bad with the eye.
Do any of these saws have much run time on them???
We can't make an accurate assessment from that blurry pic take a good clear one!
My guess is less than 15 hours on the 261. Maybe 6 hours on the 400 and probably an hr on the 500. They were new saws. See above. Ran with stihl ultra that I bought with all the saws. I used 2 out of the 3 packs and then switched to RA right before this. I used probably 1 gallon of RA mix at 50:1. Then mixed the new gas of 3 gallons of RA mix at 40:1 which that wouldn’t run so I ran a gallon combined of tru fuel through all 3 in total. The first set of pics where they are black with carbon is after the tru fuel. Not sure what they looked like before.
If I fill up the tanks of all three saws just one time, it takes over 1/2 gallon.
If I fill up the tanks of all three saws just one time, it takes over 1/2 gallon.
looks fine to me. If ut is any sort of issue the gad didn't cause it, and it's still under warranty anyway.
This is the only other one I have right now.
Well can you get. clear one later?
Safe to say no oil cleans up scratches.
Stop being a spazz and just run it. If you are really worried pull the cylinder and inspect.
I would also inspect your filter and make sure it's sealing properly snd the carb throat isn't dirty.
So with good gas, do the saws run fine right now????
Ok I read back sounds like they do run, all you can do now is either continue to just run them or break them down all the way…
You would know the more seeing the Intake side…
Ok I read back sounds like they do run, all you can do now is either continue to just run them or break them down all the way…
You would know the more seeing the Intake side…
So they all run OK now.
Yes. They all run just fine now.
Once the gas was replaced with the tru fuel, all three saws started running again.
The consensus where we are at now is the saws were vapor locking with the gas and it was probably a winter blend of gas and nothing is wrong with the gas.
As far as what caused the damage to the intake side of the cylinder, I’m not sure but will but continue to run the new saws as they are.
Damage to the intake side could certainly be from debris entering past the filter. Like bwalker already stated, check the filter.
