Chainsaw help

[Spark plug]

I’ve got been getting some big trees dropped off for firewood, so time to get the old Stihl 064 out, but it doesn’t want to play nice.

First of all it wouldn’t tick over nice so gave it a bit work to try and wake it up, but no better. Now when trying to start it its kicking back terribly, ripping the cord out of my hand to the point ware my hand and arm are still hurting 3 days later.

I’ve just had another go, took the chain and bar off to make things a bit safer and easier. It’s starting now but you have to pull it like you mean it, it ticks over without the bar on but it’s verry rough. It’s bouncing it’s self up off the bench when ticking over.

How would you 2 stroke experts recommend I start to get it running nicely again.

It’s an old saw but it has loads of power for it weight and I wouldn’t replace it with a modern offering if I can help it.

 

[Barking Mat]

Carb kit?

 

[Wendelspanswick]

It sounds like the timing has slipped but it must have electronic ignition?

 

[wristpin]

May need a thorough decoke and / or may have a partially sheared flywheel key.

 

[slim_boy_fat]

Old petrol mix emulsifed in the carb and jets during the 'dormant' period?

 

[Wendelspanswick]

May need a thorough decoke and / or may have a partially sheared flywheel key.

That would explain my theory about the timing being out.

 

[pedrobedro]

How long since you last used it. It's knocking 85cc it's always going to kick does it have a decomp button ? They all jump about on tickover. Take the mixture (H&L) screws out and fire some carb cleaner through them then screw them back in till they seat gently and open them up one full turn each. It sounds like the clutch is sticking if it runs with the bar and chain removed, does the clutch outer and sprocket spin with your hand when the saw is not running and does it stall with the brake applied ? Get yourself a nice new MS661 and let me have the old 064 to play with

 

[dobbslc]

May need a thorough decoke and / or may have a partially sheared flywheel key.

Had the same on two Yamaha RD125LC's where the key sheard off the flywheel and it would kick back like a wipped mule and wouldn't run.
Is it old enough to have points?
I'd still give the carb a good strip and clean and fit a new plug as they do go "off" . New fuel and see how it goes.

 

[Spark plug]

Shepard flywheel key could be a possibility. It runs every few month so wouldn’t say fuel problems, I never get any with other stuff that runs less frequently.

I could get a ms 661 but at nearly twice the weight and all the modern emission controls they put in a them now.

I’ve got a a big old ex rail track disc cutter that is based on a 076 that I’m looking for a knackered saw to convert it back to its original purpose for those really oversize logs.

 

[Spark plug]

Hear is a little video of it running:

 

[pcwizme]

Id worry that if the fuel is old it can cause a real issue and potentially score the piston, remove the muffler and have a look in the exhaust port with the spark plug out to see if there is any damage.

 

[Tinbasherdan]

Seems to be running well enough to me, a carb kit probably wouldn't go amiss though

 

[dannyp]

thats not to bad,

the current mixture of crud they call unleaded goes off really quick tho, my husquvarna will kick back like a mule and not idel on petrol mix thats 3 month old, tho a fresh can of superunleaded and decent 2 stroke oil, starts easy as then.

might seem odd but the chainsaw really really notices the fancy petrol more so than the track car

 

[Ton-up]

I had basically that on a saw and someone on here said have a look at the exhaust. Sure enough it was blocked.

 

[pedrobedro]

If I leave my 044 ticking over it will walk away from the job. Check the clutch is disengaging, look at the springs are they intact, does the chain run all the time?

 

[frank horton]

ur lucky over there, u only have 5% crap put in the fuel by the government..........over here, France, we have to suffer 10%, this stuff eats everything, fuel hoses, ally ,copper and brass..........
for proof, look at the Ducati web site for the the trouble they have gone to help with the problem..........also this Ethenol atracts moisture........!!!!!!!!!!!! I have a small black Museum for fuel damaged parts.........

I only ever use super plus petrol for everything in cluding our spare car........cost a little more but they all run sweeter.........any 2T fuel mixture if not used within a month goes into the ride on mower..... a thirty year old machine with an unburstable side valve V twin Briggs and Stratton.........all small four strokes of mine (walk behind mower's , genny, water pump get filled every other time with 2T.......acts as an upper lubricant for the valve's, doesn't smoke and NEVER fouls the plugs.......u wouldn't know by the way they run.......also every machine get's extra in-line fuel filter's...........
during the year, summer, winter all my hand held machines are emptied of fuel and run dry.........only filling for use.........
Husqvarna has introduced a fuel substitute for winter storage......for use in 2T's and 4 strokes......garanteed not to go off and will protect the carb internals from fuel moisture, etc... the product is good for 2 years and when I bought my last chain saw, an Echo, the dealer would not cover warrenty problems in the spring unless stored with this product.......not cheap at €25 a gallon.....but hey ho..........just put a mug full of the substitute in the empty tank, then run em up for a min and forget...........
As for Sthil I have a very old one that's heavy but sweet.......having bought 2 new'un's, Stihl's that is....never again afraid they are trading on the name..........sold all my euro trash an replaced everything with Japanese Echo.......
My Parts supplier in the UK has handed in his dealership with Sthil and sell's only Jap gear (3 dif makes) because of all the warrenty problems with Sthil........
I refuse to repair Sthil anymore, u c I repair garden machinery plus other stuff for a living........
for all the problems we have here it was nec to buy an Ultra-sonic cleaner.......it's big enough to get a Tri/Spitfire carbs and manifold in..........it's virtually always on.......

out of interest there are some mod's on line (USA) for 4 Stroke engines with bad starting and rough running, it means delacately drilling out the slow running jets in the carb..........I was very sceptical about this but bought the gear to do it and tried it on MY machine's, what a difference..........spose the problem is like in the states and Euro Emissinon controls.......
always leaning............good luck ......rant over.......hahaha.........
Frank

 

[pedrobedro]

Husqvarna has introduced a fuel substitute for winter storage......for use in 2T's and 4 strokes......garanteed not to go off and will protect the carb internals from fuel moisture, etc... the product is good for 2 years and when I bought my last chain saw, an Echo, the dealer would not cover warrenty problems in the spring unless stored with this product.......not cheap at €25 a gallon.....but hey ho..........just put a mug full of the substitute in the empty tank, then run em up for a min and forget...........

I use Aspen in the saws it is an alkylate fuel and will store for years rather than the ethanol in petrol which has only a lifespan of weeks in some cases nowadays. I know it's expensive but it saves on repairs and frustration at machines that will not run even if you just use it for storing them for long periods.

 

[Migmac]

As said check the clutch

 

[wookie]

ur lucky over there, u only have 5% crap put in the fuel by the government..........over here, France, we have to suffer 10%,

On the last trip to the continent that I was on with the MVT everybody's vehicles had running problems with the rubbish stuff they sell as fuel over there, except one guy who had brought all his own fuel in jerry cans.

The thing that gets my goat is these vehicles will happily run on really low grade fuel, 68RON is the minimum for most of the vehicles and that's weaker than most peoples pee after a weekend bender.

 

[Spark plug]

Who ever said the clutch could be at fault gets a gold star:

The clutch springs look a bit streached.

While I’m on do I just replace the springs or is there a method to check whether the clutch and durum are worn?