Stretchsaws
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Everything posted by Stretchsaws
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stihl Replacing cylinder and piston Stihl MS 260
Stretchsaws replied to Craig Howe's topic in Chainsaws
Agree with above. First and easiest job is to pop off the muffler and have a gander. Work the piston up and down and give the ring a gentle prod with a small screwdriver to check that it does flex. Unfortunately some workshops don't have a clue or aren't interested enough to work on small 2 stroke equipment, so they fudge it off by saying 'not economical to repair.' I know because I've had to do it, it's down to my service manager, not me personally. If the top end looks naffed, then give it a go replacing, but should only be done after finding the cause of the damage. Try to find a local shop/person that actually know what they're doing, or if you're in Suffolk, come and see me! ☺ -
Could be a few different things. Pot and piston may not be scored, but remember you can lose compression at the bottom end as well, sounding like a bag of nails could be worn bearings and leaky seals. Best off pressure vacuum testing before taking the pot off. We can all guess, but it's testing that gets the answer right....usually.
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Unfortunately, us dealer techs are restricted by huge parts markups and our high labour rate. I've been forced to write off many saws because the cost creeps up to 60-80% of the cost of a brand new saw with hardly no time at all. My company is an agricultural as well as horticultural engineering firm, so you can imagine our labour rates, and I work on everything from tractors to leaf blowers! Dealers often get a bad name, but it's the nature of the market. It's often more economical to have a small independent business work on small kit, as long as they know what they're doing and try to stay updated with current kit.
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The error codes in the CST can help to point you in the right direction, but I find the fuel settings info more useful IMO. If you know what the Autotune chip is looking for when it's doing its micro-adjustments, then you can get a snapshot of where going on inside the saw. For example, if it's adding a lot of fuel to compensate for a leaky de-comp valve, (550xp/560xp) then it could be too flooded to start correctly. Just an example. The CST is just another tool in the toolbox, it doesn't replace all the other tools.
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Don't mistake a small build-up of fuel vapour in tank after running saw for a while for a vacuum.
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An 026 will be getting on a bit now, so there's a chance seals, and rubbery parts will be starting to stiffen and wear a bit. An issue that arises when unit is hot suggests that it's either to do with expansion and contraction. I.e part is fine when cold and contracted, but is failing when heated up and expanding. E.g seals, etc. Or another shot is ignition module failure. When hot, the teeny tiny solder connections in the module move apart and break contact, then re-join when cold. As usual, nothing is certain without seeing the unit.
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I do the same with the classic smashed/dropped top-handle, it works out cheaper for the customer in the end.
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No, they had the older style flat cover.
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I've had to put new cranks in 4 of the earlier ones under warranty. Lately I've had a few of the newer (2015/16) with destroyed bearing cages, however the cranks were not worn.
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There are many highly skilled and knowledgable people on this forum who can help with any number of problems, but at the end of the day, you're the one with the actual chainsaw that has a problem. So it boils down to hands and eyes...take it apart and look at it. How does the chain brake function? A band, essentially a big spring, tenses and relaxes, gripping or releasing a clutch drum. So either there's not enough gripping going on or none at all. Check all parts of the system, for wear and contamination, or if any are missing! Swap the side cover or drum with a known good one if you can beg or borrow (not steal) one.
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Not really right mentioning names of employers.
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On my bench last week was a 346xp that has sat with fuel in it on someone elses bench for a year or two! Carb went through the ultrasonic cleaner 3 times and fitted carb kit in Monday. She runs sweet as ever now, saved the customer £130 for a new carb (yes I work for a dealer!)
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No offence taken Spud, perhaps I was a bit defensive. We've all had different experiences, when I sprayed it in small amounts around a Husqy 350 intake it sent me around the houses, yet on the 026 clutch side seal, it was a handy pointer.
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I suspect you're correct, there are so many variables with chainsaws, more so than other 2-strokes in my opinion. There's chain, bar, type of wood (or plastic..go figure) being cut, fuel, carb, tank vent, hoses, mating surfaces, gaskets etc. etc. That's why I love em I guess, the challenge. Hope you get to the bottom of your issue.
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At the risk of getting shot down in flames by making suggestions, I'll share a few ideas. If the saw is idling, then fuel is reaching the carb, however it might not be getting enough.Take the top cover off and look at the intake area when in the cut, anything out of place? Hoses all intact? You can do quick checks by taking the exhaust off and having a peep at the piston. All quick little visual tests that can save a lot of guess work.
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I agree, like I said it can give false readings. Which is why I wouldn't rely on it at all, however it was useful to me once out on site at a customer's when they asked me to look at their erratic running 026, so that's why I mentioned it. Also, I agree that it sounds like a carb issue, and was not trying to send the fellow off down the garden path, just trying to help.
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That's a fair point, the Stihl vac/pump kit was around £200! But I picked up a Bluepoint one for £90, which is a bit better. One method to check is to get a can of carb cleaner with a long nozzle and whilst the saw is running, carefully spray in areas where air leaks could appear I.e around intake manifold, impulse line, base gasket etc. However, the saw needs to run first and you can get false readings if any spray gets sucked into the carb! Your saw sounds like it's a fuel delivery issue rather than an air leak, so I'm not trying to lead you off on a tangent.
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Any saw rebuild that involves breaking the integrity of the cylinder/crankcase needs a vac/pressure test, in my humble opinion. However after one rebuild I remember chasing what I thought was an air leak, but turned out to be an incorrectly aligned spring on the carb causing a high idle. Just check, check more, and check again. Sounds like its lacking for fuel.
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Yes, like myself, do a land based engineering course for 2 or 3 years or an apprenticeship through a dealer and then learn through experience working on the machines day in day out, and go on the training courses offered by manufacturers to dealership technicians, which are actually quite useful. Other than that you can get old saws and strip them down and rebuild them and figure out the 'mechanics' by yourself. I get the best of both worlds by doing chainsaw repair in my own time and working for a dealer as my full-time job. Happy days! There are some good books out there, 2 stroke engine repair by Mr Dempsey, bit old now, but some good info.
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The solenoid is a part that can fail but I'm not sure I'd call it a wearing part that needs regular replacement. I guess it's possible they had a bad run in the factory and the dealer is replacing bad for bad (has happened to me several times!) When I did the Stihl technical training last year they said it is a part that had caused problems with early models but should have been debugged by now.
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Just finished rebuilding my old 200T plus adding a cheeky little extra hole in the muffler to add a touch of spice. When I was in the trees it never missed a beat, now I'm on the spanners, I still love it! Plus an honourable mention for my faithful 357xp. See all sorts everyday though, love all the mainstays, Husqy, Stihl and Dolmar.
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Looks like an 08 S. Can't say for sure though.
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Quiet day for chainsaws. Got an MS 271 in with bogging issues and a MS 391 in for a service and bits n bobs. All good fun.
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That there saw needs a buckshot muffler mod á la Chainsaw Guy!
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Cool. Thanks. Hope all works out well.
