Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: ECpirates96 on January 20, 2012, 01:44:14 pm

Title: Aftermarket cylinder and piston for MS250?
Post by: ECpirates96 on January 20, 2012, 01:44:14 pm
Any recommendations on a cylinder and piston? I just pick one up that was scored and with either rebuild or keep around for a parts saw. OCD kicked in and made me buy this saw!
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: Al Smith on January 20, 2012, 02:01:24 pm
Out of curiousity I flea bayed that one and got surprised .I had no idea they made an after market cylinder for a clam shell engine and they do .I learned something today .
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: Cut4fun . on January 20, 2012, 02:46:03 pm
Sure it cant be cleaned up? Cylinder and then maybe just needing a piston?

Used 250 p+c $69 shipped on ebay.
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: Al Smith on January 20, 2012, 07:15:39 pm
I did find a piston pretty cheap like 19 bucks .If that cylinder would clean up it might be the hot ticket .Rubber gloves ,3m green scratchy and easy off oven cleaner might do it .No flap wheel now ,you'll grind right through it before you know it .Traveled that road .
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: ECpirates96 on January 21, 2012, 11:52:15 am
The motor actually turns free so it may just need a piston and rings. Are the ones from HL ok or is there an after market that is better?  ???
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: Old Iron Logging on January 21, 2012, 01:11:53 pm
Make sure you get the right piston. 2 were made 42mm and 42.5mm. May not apply to the 250 but does the 025.
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: Cut4fun . on January 21, 2012, 01:13:53 pm
What makes you think you just dont need rings? Have you looked through muffler or had piston off yet?

I havent heard anything good yet on the HL place. Only bad reads so far.
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: Cut4fun . on January 21, 2012, 01:22:45 pm
IF you need piston kit. AFM Meteor   42.5mm http://northwoodsaw.com/store/index.php?l=product_detail&p=68

42.5mm ring  http://northwoodsaw.com/store/index.php?l=product_detail&p=704
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: ECpirates96 on January 21, 2012, 02:43:28 pm
Thanks. I am taking it completely down tommorow to see what I need. Rings only would be great. I will keep you posted and maybe some pictures.
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: Al Smith on January 21, 2012, 09:22:26 pm
Well I kind do some stuff half fast some times but I've buffed them out if they aren't too bad . A low spot below the rings unless it's a giant one usually won't hurt you .A high spot is what breaks the surface tension of the oil film and will get ya .

The thing won't be perfect but you probabley won't even notice it if it holds compression .Just depends on what you want to do with it I guess .

You get it going with maybe new rings  and  run it with 32 to 1 and it might go for years .
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: ECpirates96 on January 24, 2012, 08:47:59 am
I got it broke down last night and the piston is toast but the crank, bearlings and rod look fine. Looks like one I get the new piston and rings in I may have a good engine.
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: Al Smith on January 24, 2012, 09:24:05 am
Well now it depends on what side of the piston is damaged .If it's scuffed on the intake side it ate too much dust .If it got burnt on the exhaust side it's either sucking air or somebody tried to lean it out like a model air plane engine with some misinformed information it would run better .

Most times if it's cooked on the exhaust side  it does irrepairable damage to the cylinder but not in all cases .
Title: Re: Aftermarket cylinder and piston for MS250?
Post by: ECpirates96 on January 26, 2012, 09:09:40 am
I can feel it a little on the exahust side but it doesn't look or feel bad. I am going to scotch brite pad it and try a pistin and rings and see what I have then. Thanks