spudulike
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Everything posted by spudulike
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Brushcutter blues
spudulike replied to the village idiot's topic in Forestry and Woodland management
Pretty simple to keep the revs down - just turn the H screw anticlockwise until the thing doesn't scream and it would be pretty difficult to seize one then if the mix was OK. The 545 may be salvageable depending on the state of the cylinder and it may have failed through an air leak or bad mix. I have seen saws where the carb has limiters over-rev even with the H screw turned fully anti clockwise to the limit so you really need to find the maximum permissible revs, take off 1000 - 1500rpm and set the carb to this with a tach - limited coils make this a bit more difficult but still possible. -
MS660 Chinese crank, one careful owner: -
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I have just stripped down a customers saw and new the crank bearings were shot but they have taken out the crank as well. The retail £130+ makes the repair very very borderline Sooooooooo Has anyone got a good crank or bottom end(with Crank) they don't want silly money for. I am happy to pay a reasonable amount or make an agreed sum donation to the Childrens charity in recompense! Fingers crossed:thumbup:
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Acoustic Research eh, got a pair of Castle Severn floor standers myself, not quite as old but still cut the mustard:thumbup:
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And so endeth the lesson for today:001_tongue: Only worth doing on cold and wet days when you have nothing else to do.
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I reckon that piston is original, Stihl use that "S" with a box around it with the arrow on their pistons! Chances that your verniers may be reading low and there is a little wear.
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With the throttle valve closing, it can only run on a fast idle and without much power. Sounds like a bad air leak or the throttle valve sticking open a bit. What happens if you force the throttle valve closed by pushing it with your finger where the cable links to its arm?
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Blimey-we agree on something - we could have places that do a big mug of coffee for £1 and muffins for £1.....bugger, I have invented Poundcafe a subsidiary of Poundland:blushing:
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Yes, must be 42.5mm!
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It is one thing getting the hardware and another getting support for it. I believe Stihl only issue it to dealers as they are the only ones that can service their machines correctly:001_rolleyes:
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Looks like Meteor do a 40mm one for the MS230 and a 42.5mm one for the MS250. Strange yours measures 42mm but perhaps it is a cheapo aftermarket kit rather than the OEM part. The piston looks seized front and rear - that is unusual! It is possible that you are measuring where there is wear on the piston. I usually measure across the top side to side and it is correct the piston is smaller on the top than the bottom! Have you measured the bore? Are your vernier calipers decent??
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And that is why I dig out the callipers before ordering pistons:thumbup:
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Yes, side covers are OK but the gears in the adjusters on the 372 type are made of cheese or something of similar hardness......Oh.....soft cheese:001_tongue:
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I usually ask if it is a primary work saw or an old hack backup. Chinese parts can be really mixed. I have had cranks snap, big ends fail, piston ring pins come out, rings snap, AV mounts fall apart etc and these are the Good parts:lol:
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There is a plastic catch on the end of the choke valve rod and this catches on a plastic cam on the end of the throttle valve rod. Page "N" and numbers 5 & 13 are the latching mechanism - http://www.hsqintec.sk/vykres/h-550-xp-autotune.pdf Unlikely to have worn, possibly the choke lever isn't pulling the latch over quite far enough to engage or it is full of crud - difficult to tell without seeing it.
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It was common on early 064s and 066s for the fast idle cam on the choke rod to break off making starting almost impossible. It was usually caused by people pushing the choke lever down too far and hard and then forcing the lever back up without opening the throttle fully. Not seen it on any 660s though!
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I was contemplating it but they were nice, no play, very smooth so gave them a good clean, blast with the compressor, oil and they were then VERY smooth so left them as they were and it all felt good. Not seen any issues with 346 bearings before so all good in the end and am sure they will last. Just trying to keep costs realistic!
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So....Chinese cranks, here is my experience with a MS660 that is used commercially by a hard worked outfit doing a lot of council type work and typically on a 30-36" bar and chain. The original big end failed so the first Chinese one was fitted, the crank sheared (pics below). The second one - has just come back and the big end has failed....fortunately, the cylinder has survived both times and am now weighing up the cost of repair with OEM parts.....ouch:thumbdown:
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You sure this is worth it? The brown on the piston is not always a bad sign, just depends on what compression it was making in the first place. probably just needs a look by someone who has a bit of experience!
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I usually check the compression is OK and then check the carb out. The gauze filter in the carb is the common one to get bunged up. The saw may just need a bit of love and attention if it hasn't been serviced lately! Most issues are fuel related, then compression then spark/ignition but it is one thing stating them and another finding them!
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Nothing aftermarket here - it is a work wagon:sneaky2:
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Totally standard.........
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How is that Chevy Hemi big block going in your landie:sneaky2:
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It is like stress and creeps up on you leaving you feeling bloody awful. I suffered from stress much earlier in my life and still get a bit edgy now and then but am much more laid back now....but not in my work!!!! Usually physical work, projects, focusing on something else that you like doing, just keeping very busy will help! Good luck with it!
