spudulike

Sounds like lack of compression. Worth trying to find out what scored the piston before fixing and running it incase it goes again.

Will this master plan involve invading Belgium and marching in to France because it has been done before:blushing: Hate to tell you ....the Germans didn't win:001_tt2:

Now theres an offer, I have always thought the exhaust port looked a bit small but not done the piston measurements to see what can be done but there should be a fair bit to get it going even harder. Think Jons suggestion of a MS660 on a 16" bar is only suitable for Russian power lifters with wood cutting tendencies:001_rolleyes:

There are a number of things that may cause this, if you havent got an Ultrasonic Cleaner - get some carb cleaner, I use Rockwood as it melts most substances known to man, remove the H screw and blast it through in very large amounts - if all is well, you will see it coming out of the brass H speed circuit check valve inside the carb bore. It is worth doing the same to the L screw but it sounds more like the H speed is playing up. There are a few other issues that can manifest in these carbs that can cause issues. Sometimes the crank seals can look OK but if you rotate the crank round or put pressure on the end with your thumb, it can allow air to piss out/in!

Never done much to a 254XP, I have had a couple, revs a bit like a 346XP but has more low down torque - damn good saws IMO. Be an interesting project to see what I can get out of one:thumbup: This saw must have made Husqvarna a fortune and deservedly so!

Sorry for hijacking the thread:blushing: Must stop doing that:001_rolleyes:

OK, looks like the cold night air has cleared the alcohol fueled bravado, we are now out of the car park, back in the bar, man hugs all round and getting last orders in. We have all written pretty much the same thing:thumbup: Good night all...love you all:thumbup1::lol:

I find it varies from saw to saw - I would rather strip an MS200 than a 335XPT but a 346 or 254 is easier than a 026/MS260 but not that dissimilar and depends on how many you have done etc....lets look at the MS390....Oh.....lets not:blushing: that handle arrangement.....oh....makes me shudder:blushing: Build quality - also depends from saw to saw - each manufacturer has their high points - Husky - 254XP...one damn good saw....Stihl 066 - still a big hitter. Working for a German company for 30 years has jaded my opinion of anything that has hailed from Germany - just the way it is and nothing will change that...sorry. The Torx bolts are quite nice though:thumbup: But why T27 - such an odd size??? Anyway...what about Tanaka and Echo:001_rolleyes:

With which bit Barrie or is it the three pints of cider talking:thumbup1: Think it is that time of night, too much alcohol, Monday off work and hot weather:001_rolleyes::lol:

You are becoming predictable Rich, are you of German ancestory....Count Von Rich of Dover....not sure about that M8, doesn't sound quite right:lol: Ponder on this my friend, if Stihl are so great, why did they design a decomp valve that, if it fails, it falls straight on top of the piston........and Husqvarna - well they fitted theirs behind the wall of the cylinder with no damage if it fails:001_tt2: Not so great when you think about it! No one will win the Stihl/Husqvarna debate - it is like religion and politics...there is no correct answer just personal views!

Each man to his own, I try to repair them and keep the repair cost effective but my time is exactly that but different for each repair shop. Don't worry, I wasn't keeping anything from you I haven't told you about already:001_tt2: Never had this problem with Husqvarna carbs:001_rolleyes::lol:

Just the normal carb fix issues Rich - the OP PMed me and I obliged as normal. Last guy to ask me that question was Megatron:blushing: The outcome is he is going to fit a mates carb and if it resolves the issues, will purcahse and fit a new carb. Fixing these carbs is a war of attrition and I aint giving in:thumbup:

All three MS200Ts now running, the last one was a bitch, couldn't lean the carb down to bring the revs down despite doing an accelerator pump fix and a damn good clean in the cleaner, a good blast of carb cleaner resolved the issue in the end:thumbup: Celebrated by cutting the grass and splitting some logs:lol:

I have responded to your PM and have said what I think the issues may be. A 2010 saw is a later model and unless the saw is a high hours one, the issue probably is the carb. Try another one on your saw, it is a quick way of finding out what the issue is.

let me think...Husqvarna or Stihl....Stihl or Husqvarna........Orange for Stihl:confused1: you colour blind Rich:lol: A rethink is in need here. Husqvarna........North Herts Shouldnt we just have a shoot out - one long length of timber and a big basket for the cookies:thumbup:

I haven't forgotten it Andy, just been fixing a flood of non working kit before takling it:thumbup: There is no confusion over working and racing saws, I do the work that reaps 80% of the power gains and that fits with most peoples needs. The longest running saws I have done are Stubbys 346XP and Burrells 357XP and both have now had a lot of work done with them to much satisfaction! The only saw I have got a bit radical with and gone pop up and full port plus a couple of other extra tweaks is my 357XP and that would just be too expensive in time to do as a standard offering on a working saw. I guess two heads have different thoughts whizzing around in them, that and a background of motorbikes and having watched much racing doesn't help:blushing:

Thats one good reason for tuning a saw - lighter saw doing the work of a larger one and being less tiring on the old body. My involvement in porting was just getting a bit fed up with just FIXING saws and wondered what I could do with a 346XP and what it would go like...that did it for me!

The only heads that get broken are undoing rusted up bolts that won't shift, usually on mufflers. Nice set of kit, only trouble is the T27 would get used all the time and the T25 would be too long for side covers and internal covers on the recoil MS200T - the rest would never get used! I use these - EXPERT T27 1/4" HEX. DRAPER TX STAR TITANIUM NITRIDE COATED INSERT BIT 25MM LONG x 2 | Insert Bits | General Hand Tool | ToolSupermarket.co.uk Never felt the need for anything more for this sort of application - why over complicate matters!

The guy that I did this saw for already has a 357XP that I prepared for him, for jobs where he would have typically grabbed a MS660, he is now using a saw that weighs a lot less, cuts nearly as fast and has better AV - he has noticed a big difference on the impact on his body. Apart from that, most guys that run these saws just get more out of them - lighter, faster, more work done, greater satisfaction......I run mine and they are just more enjoyable than their standard counterparts. I guess you just love modified kit or you don't, I am always looking to get the most from any mechanical kit I have, others leave it well alone! Never knocked the MS200T, best topper out there but when it comes to others - the 346XP is just a better saw than the MS260 and the 254XP better then the 026 IMO - the Stihl is just a bit of a banger compared to the Husqvarna in this range - Saws from each manufacturer have their own strengths but I love the Swedish saws for many reasons and having worked for a German company for 30 years has kind of jaded my opinion against Stihl and toward the Swedish kit:thumbup: Everyone is entitled to an opinion and their own views - Rich, you may change yours if we ever have the next Sawfest and you come up here:thumbup:

Finished porting the 372XP, nice job, pics on the Muffler Mod thread....just had three more MS200Ts in, all with idle issues, have baked the carbs in the cleaner and just need to strip them and pressure/vac test them before reassembly and testing.

You just use a small "T" bar and get used to giving it just enough:thumbup: you can usually tell by the torsion in the bar as to whether it is about right or not.

May as well add to this...been lightly modifying a 372XP for my mate Burrell (Martin), Exhaust port and inlet port widened, upper transfers re profiled, lower transfers heavily modified and a muffler mod to wake the dead. Sounds rather nice now, fast off the throttle and the tweaks to the squish have given a whopping 180psi comp.....:thumbup:V nice. Lookng forward to testing it - should eat 441s for breakfast:thumbup:

It appears that the OP is elated about finding a decent beverage being sold by the roadside by some dudes that looked like ZZ Top, he appears to have had a drive home looking forward to drinking said beverage safely in his own armchair....I hope! No need for the aggression unless the OP confirms he is a drink driver and got wazzed on zider with ZZ Top and then drove home:001_rolleyes:

Barrie - have you ever thought about lawnmower racing - you could run an alternative to carting with that lot, charge the punters £40 a time and tell the owners it is part of the testing procedure:thumbup: Tached another MS200T, the accelerator pump is now isolated and the saw runs spot on - it is the fully tuned variety so has a bit more....punch:thumbup: The MS260 was a worry, it had a new piston, was returning high compression but stopped after around 5 mins of running and wouldn't restart, had visions of a failure like Rich had - snagged rings but the conpresson still felt good and I had smoothed the exhaust port as I always do. Checked the spark - none, checked the lead, fine. Changed the plug....a good spark, tried my patent special plug with 4mm gap....fat spark so...the plug had failed, first one ever:blushing: New plug fitted, tached, still pulls 180psi so all is rather good apart from telling the owner I wasn't that happy with the bore and would knock £20 off my repair bill.....before I measured the compression:blushing: Oh well!

Mmmm, the neighbours are still talking about your 372XP, one of the villagers came round to complain after my test run, took one look at it and whinged at another neighbour I had sold a 024 Stihl to and had been using it a little:001_rolleyes: Don't think he liked the look OR the sound of it - flippin loud! Oh...the muffler was on their already, my work was the trick stuff to the porting:thumbup: One fast saw!