spudulike
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Everything posted by spudulike
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I was thinking it was a different piston and cylinder between models like the earlier 365 ND 372XP. Looks like they got lazy with the design!
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Bloody predictive text......if the caps are off!
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Yes, ignition the limit caps are off.
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One turn out from fully in If the limiters have been removed. If they haven't , unless you have a tach and know how to use it then leave well alone unless a fault is suspected. If the saw has a blue limited coil, care should be taken in tuning the saw.
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It would be VERY unusual that the spring has lost it mojo - I have known them break but not fail like this. It may be that the spring needs taking out and cleaning with a craft knife - check the pulley spins round the shaft OK then when reassembled but not under tension, make sure the pulley is still free. If the pulley then becomes stiff after you have tensioned it, it is possible the centre shaft or hole in the pulley has worn - it usually makes the pulley rough and rattley in operation but generally on much larger saws. Have you put too much grease/oil on it? They like very light lubrication!
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Your original post was to convert a 365 x-torque over to being a 372 x-torque. To do this you would need the Cylinder and piston (around £325), possibly a carb and other parts! If you were looking at converting it to a 372XP, you would need a suitable piston and cylinder kit - OEM or aftermarket, the carb, inlet manifold and air filter manifold and possibly other parts. I am not sure how this can be done for near to nothing:confused1: The bottom ends appear to be the same on all these saws (the IPLs will confirm this) but the top end and fuel delivery are completely different as the x-torque separates the air from fuel/air vapour to feed the strato transfers via the piston ports!
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Yes but loads of the carb choke diameter is just feeding air in to the strato system! Have you got the 372X torque kit yet - I have one of these saws on the bench and was forced to fit an OEM piston as there were no aftermarket ones or are you fitting the earlier XP kit - if so, you will need a new inlet manifold, carb, airfilter manifold and possibly other parts:thumbdown:
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Yup, that is pretty much what we have found:thumbup:
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Looks like you have found out that the people who say to richen the saw after porting, really don't know what they are talking about. The extra flow through the carb is increasing the fuel being pulled up through the main check valve - try moving the metering arm toward the carb body by 0.5mm - it will lean it down a bit and may help - if the saw is done well it should pull 14500 - 15000rpm quite OK. It may be your saw has a worn H adjuster - my 346XP did similar but could get it up to 15,000 with the carb on 3/4 turn H screw.
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Tell it to me straight Rich - what do you think of the Hsqvarna 435?:lol:
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Just call it "Hot Babes Wrestle in Grease" That should do it:thumbup:
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They hurt my head:lol:
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The squish band is set to stop the piston clouting the top of the cylinder but also controls detonation, the theory is to keep the combusting fuel on the centre part of the piston rather than the hot outer parts which will eventually melt and pit the top of the piston through compression and igntion advance. Lowering the squish increases compression, increased compression gives more torque, a pop up and turned down base or squishband and base means even more compression and torque plus the upper port timing will stay the same if a pop up and base is done correctly. If the compression is pretty healthy then the height of the exhaust port can be raised to raise the powerband without losing valuable compression. If the height of the exhaust port is raised, the blowdown will be increased which will reduce the fuel charge in to the cylinder which will also require changing by raising the uppers. Who said it was easy:001_rolleyes:
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My Stihl Red Eye 066 - for those that have been following my progress - it was acquired after the coil went bad, the flywheel is keyed completely different from standard, I tried re-keying it and damn near blew the thing up - far too much advance. I then applied a bit of science taking pictures of the dual key flywheel, drawing lines over the keys and measuring the angle. I recently had an 064 in and managed to measure off the difference it had on the keyway to my standard flywheel and bingo - 52* as I had on the images so filed out a big key, fitted a new key in the crank and used JB weld to form a new keyway. I ended up bang on the 54* I wanted - that is standard + 2* advance - it will kick like a mule once the compression is up but should be bang on as far as ignition timing goes. Next job is to machine the base and pop up piston - there is a big fat base on this cylinder so will see if we can get 0.75mm pop up and then adjust the ports and transfers!
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And you have the habit of "just passing by" don't you:001_rolleyes:
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Thanks Rich:thumbup:
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If the saw runs fine on a different carb with no sign of the issue then it is the carb that is the issue. You then need to work out if the issue is on the high speed circuit or low speed and then work on that part of the carb....or fit a new/known good one. If it won't run on a known good carb then I do a pressure/vac test, check the piston/pot and then rebuild knowing the base machinne is in good order. Common faults on these carbs are check valves, accelerator pumps and leaking welch plug.
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Not too many saw dynos out there, a few in the US but don't know of any in the UK. I usually say I expect 15-25% reduction in time to cut a piece of timber but it isn't n exact science unless you spend hours doing before and after cuts using the same cutting gear etc. The 357XPs I have done have been timed against 560XPs and keep up with them! Cost - PM me if you want a quote - it varies from saw to saw!
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Bet it killed you doing that muffler mod didn't it Rich - thought you weren't in to tuning:sneaky2: The dual port muffler ups the 066 HP by around 0.4 HP - should go a fair bit better now:thumbup:
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All this talk of age Rich...I am quite relaxed about mine, I am guessing that you approaching 30 yrs may be giving you some issues and you are wondering what might have been. I quite enjoy kicking round the flea markets and bricabrack/antique shops, always something worth having! I guess it will come to you at some stage but don't think you will be looking back at this era and its low quality goods and reminiscing about them! Old age...pah, maybe on the outside but still have a sense of humour of a 12 yr old:lol:
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I actually had a rare Saturday off going round a couple of Essex Antiques Emporiums - had a really good day out:thumbup: Been on the 064 today and seems to spin up quite nicely:thumbup:
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Spent my Sunday porting a 064 Stihl. The exhast port widenend, the inlet port widened and squared up similar to the 066, the lowers opened up a bit and the upper transfers......noticed they were uneven so leveled them, got a little angle on them and ended up with 19 degrees blowdown, 162 degrees exhaust - same as standard and the squish spot on 0.5mm. The piston windows were also significantly opened up an flowed. The saw has a pretty rapid pickup now, probably won't get the chance to use it as it is damn loud but early signs are good - just need to run and tach it. No pics - the camera batteries ran out! One benifit of doing this saw is that I could check the degree difference of the Red Eye 066 ignition timing using the 064 coil. The degree difference on the dual key 066 flywheel part 122 400 1214 is .....52 degrees - fact! Makes my own 066 mods much easier now:thumbup:
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Had an 064 in for porting but had a couple of interesting faults - an oil leak traced back to a faulty oil tank vent pissing out oil. The other one was that the saw just wouldn't hold pressure or vacuum and had an ever so slight leak - I generally use the carb to plug the impulse line and there was the issue - found the pumping membrane had a hairline fracture in it allowing the thing to leak air and not hold pressure. A nice fault once sorted:thumbup:
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So you have had a busy weekend Martin - looking good and the chipper looks nice in the pic:thumbup:
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Wo worries Alastair, glad the check worked out, just crossed my mind as worth checking - had an MS460 in with a similar fault a few weeks ago and glad it worked:thumbup:
