Any ideas stihl combi wont start

[sasha.p]

Sorry my mistake didn't mean to cause any confusion was rushing earlier I meant 4 mix not stroke and yes fuel was mixed 5l to a one shot same as I use on most my tools not neat fuel I will wait to hear back from my dealer and get them to check it out its probably something simple and im just too tired to see it but thanks anyway always worth asking just incase

[Ray1]

My guess is that it has dropped a valve.

[Lozzatrees]

We have several Combi units with the 4mix engines, and have had several of them seize after problems getting them to start, etc.

 

Eventually after spending a fair bit of money fixing them and chasing Stihl on an answer; we found out we should have been using Stihl's more expensive green two stroke oil in the fuel mix which nobody told us when we bought the machines

 

As a result we have now gone over to using the green oil for all our 2stroke equipment rather than mess about with a seperate fuel can for the 4mix engines.

[RobRainford]

My dealer told me The green hp ultra oil is recommended for the 4 mix engines. Using the cheaper oil causes problems. I've seen con rods blow out the side of engines on the 4 mix blowers.

[Warners]

I'd be interested to see what the dealer says. I like the 4mix engines. Seem quieter and less intense than a usual 2 stroke.

[Acg128]

New 4s are 25-1 mix?!

[Acg128]

We have several Combi units with the 4mix engines, and have had several of them seize after problems getting them to start, etc.

 

Eventually after spending a fair bit of money fixing them and chasing Stihl on an answer; we found out we should have been using Stihl's more expensive green two stroke oil in the fuel mix which nobody told us when we bought the machines

 

As a result we have now gone over to using the green oil for all our 2stroke equipment rather than mess about with a seperate fuel can for the 4mix engines.

 

You still require 2 fuel cans as the mix's are different? 50:1 for saw and two stokes and 25:1 for the new 4s.. That what I was told by dealer.

[sasha.p]

Sorry I was so tired the other day I didnt get a chance to look at it after I first took a quick look until yesterday and I pulled it and it started!and sounded like its running ok so I used it for a short whilejust to have a listen and see if it sounded ok and if it was going to do it again and it didnt so now im confused so I have absolutely no idea what the heck happened the other day but it appears to be running ok.

 

Thanks for the advise about the green two stroke I did not know that and maybe its on its way to seizing or somthing I guess if its going to go it will go soon after what happened the other day I have not had a chance to check my e mails so not sure if the dealer responded yet but when they do I will ask them what to do but I will pop along and get some green two stroke for it. After the mention of what ratio the mix should be I just dug out the booklet off the shelf that came with it to double check as I scribbled the ratio on the plastic when I first had it in permanant marker and just wanted to check incase I had got it wrong this is what it says it recomends stihl moto mix but says its not widley available or to use only stihl two cycle engine oil 1:50 anyway got to get to work thanks for the advice everyone:thumbup1: