spudulike
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Everything posted by spudulike
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Was that a Zama carb? Was there any modification to the saw as the Zama throws in less fuel than the Walbro and I often set the H screw on modified 357s well over the standard one turn out. Was the saw tach tuned on the final set up? Is the fuel tank breather OK? Something has caused the issue - the fuel thing, often a seize is slightly old fuel or cheap two stroke that has no effect on all the other equipment as they are all set a bit rich and the one that goes has a slightly leaking seal and a carb that is tuned a little too lean goes bang!
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I asked as sometimes parts fail or are faulty so personally, I would recheck it as is to ensure it is still airtight. Is the fuel line OK and is the gauze filter clean?
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Most common causes are intake manifold, clutch side seal, impulse line come off, bad fuel or carb adjustment bar the EPA ones with the auto decomp. Have you done a pressure/vac check again? What did you tach to?
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Mmm - The 346XP is a completely different beast to modify than this MS150. The muffler is relatively simple but the ports are very significantly modified to get that performance. Glad you are enjoying it:thumbup: There are a few issues in modding the MS150, easy to see the vid and think it is all easy - a new flywheel is £65.90 ex VAT so if you go a bit far with the file:thumbdown:
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Always the stupidest of faults that catch even the best of us engine builders out. You live and learn.
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A leaking welch plug can cause these symptoms as can an air leak. As far as the test equipment, I have two systems that I use and always have a backup. The 372s will fail a leakdown test on the clutch side seal and the impulse line as a common fault. the decomp tends to leak also. Sounds like you need some better test gear long term!
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Looks in nice condition:thumbup:
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Or get that good at chainsaw repair that local guys will throw as much timber as you want just to get their kit back up and working......sort of works for me:thumbup:
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Husqvarna did a short shaft trimmer that looked a bit like that, looks like a good job, hope it lasts:thumbup:
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Royal Enfield.....my brother purchased a 250 and it never did run right, there again he wasn't as good a mechanic as me:sneaky2:
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The saw got packed up today and found......a 12" bar and chain in the box:001_rolleyes: I now reckon that there were a number of slight issues that were exacerbated by a stupidly small bar on such a large saw:lol: The 365 would be more at home on a 20" and it is now a 372 so 20-24" on that. Needless to say, it is now tuned pretty fat on the top end otherwise on a 12", it will fail again - I use an 18" B&C to tach saws on the large Husky mount.
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Or just fit the original type again. I think the Zama did have a tendency to bog when you grabbed a handful of throttle where the Walbro handled it fine. Had some fun with a 372 and Jonnie equivalent some time ago!
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Love you too:001_huh:
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Forgot to say that the bottom end had a good flush out and it took out a lot of aluminium powder but the bottom end is now smooth like silk:thumbup:
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The saw is wearing a new Meteor 372 top end, the carb is the same as the 372 so no issues there. The crank seal under the clutch has been replaced along with a bit of tidying and a couple of helicoils and spare parts but the saw is now airtight, all the checks have been done bar the final tach tune. I would say the issue was a mix of fuel and a slight air leak. Sometimes it is just a mix of a number of slight issues that can take a saw out. The factory limiters were still I place so unlikely to be a carb setting issue but will tach up to around 13KRPM and all should be good now.
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It will work but just not as well. I wouldn't try modding it with this carb. Last time I tried one of these carbs on a 372 I had issues and refitted the Walbro one but never found out if the carb was the route cause. Try it, tune rich and check the plug colour.
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OK, must have been a lack of fuel on acceleration caused by the L screw. Typical compression on a good MS200 is 170psi and on a well worked one is 150psi, anything below 150 isn't good and the maximum I have seen is 210psi on a modified saw.
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You would normally start with one turn out on both the H and L screw, if a saw is bogging at low to mid revs on pickup, sometimes it is just the L screw being a little lean. Be aware that many MS200s still have the carb limit caps fitted and these will stop you changing the H screw by much but that may be a good thing as it should run OK on factory settings. If an 020T carb has been fitted, these often run at settings other than 1&1 as there is only one pick up for fuel to feed both H&L screws meaning if you change the L screw setting, the H screw changes as well so more difficult to dial in. I have never just fitted a ring, worn rings usually mean the piston skirts will have excessive wear or enough wear to warrant a new piston. I have had saws make good compression but have no torque just down to a worn piston. What compression does it make on the first pull?
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What is the compression measurement? If the original rings were shot, I would have replaced the complete piston as a worn one even with good rings can lose compression. Did you hone/roughen the glaze on the bore when the new rings went in? The bogging you are experiencing may just be poor carb adjustment - try putting the H&L on one turn out unless it has an 020T carb where the adjustment can be more varied.
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Yes I remember now, no need to check, that is a good step forward. Do the plug and lets go from there. Can't be too much with the compression that saw has:thumbup:
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OK, did I put a Zama carb on it? I think I did from memory but am not 100%? If it has one then try a new spark plug and then drop it in if no good and will do a pressure check and carb overhaul. Also make sure the filter is still on the end of the fuel line.
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Not a problem, always glad to see my work still out there and working well:thumbup:
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Mmmmm all in the name it would seem.........I should really stop insulting my customers..........there again:sneaky2:
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Hope all is well with you and business is good down there in the West Country.
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Nice to hear from you again, been missing your dulcet tones:lol:
