Stihl cylinder/piston kits. Genuine or non-genuine?

[Ray1]

You would need to make sure you check all the things that may have caused the issue in the first place on refitting though if I just clean the bore!

 

Thats the problem, it would be best to send the full engine and control handle so it can be completely tested, its only 3 screws to remove the full unit.

[SawTroll]

Thanks for your replies.

I bought the machine on e-bay. I could not bring the revs down by adjusting the high speed jet. ......

 

That sound like there is an air leak. The leak has to be found and fixed before you put a new top end on there - if not the new top end will suffer the same fate in short order.

[Charles Ekin]

Thanks Sawtroll and Ray1 and great offer, Spud, thank you. I am in Fareham near Portsmouth. The machine is an FS400. The cylinder is off, the piston still attached. The piston is scoured as well. If pictures would help, I can always photograph it and send them to you. I have a reasonable understanding of the machine but my experience/level of expertise in the mechanics of it is nothing to write home about. Ideally, depending on the price, it would be great to hand the whole lot over and be done with it. Alternatively with the pot and piston (either honed - possible?) or replaced, I could have a go at it myself but without a torque wrench or specialist tools, it will be a faff. Let me know your thoughts and again, many thanks for the offer of help. Charlie

[bobh]

Send it to Spud, it'll come back working great.

 

Sent from my Nexus 7 using Arbtalk mobile app

[spudulike]

You are well off my beaten track. I guess one option is just to check the impulse line, inlet manifold and then fit new seals and tune the carb a bit fat on the top end, this way it would have a chance of survival but as I and others have said, a full pressure and vacuum check is really the only way to ensure the engine holds air - critical on two strokes, especially on vacuum!

 

Doing the work isn't particularly easy though

 

Posting such a large lump of kit won't be easy and don't know any one near you!