560 running problem

[muldonach]

I have a 560 which has not really done a lot of work from new - it is now over 2 years old and out of warranty.

 

It was used for a few days felling in the spring and was reported to be running fine, it may have been put away with some petrol in it.

 

It is now lacking power at the top end - it will start and idle no problem but when the throttle is opened up the saw "hunts" - it will rev up fine but then die off - it is almost as if a rev limiter is cutting in, then rev up again basically it is working but it ain't working anything like it should. It happens whether the saw is in the wood or not. One possibility is that it is being starved of fuel but if that were the case I would expect it to be screaming off load as the mix leaned out.

 

It has been to a dealer and returned with the comment "we cannot find anything wrong with it" - there is something bloody obviously wrong with it imo!

 

I took the plug out this morning and if anything it is running a bit over rich - plug is chocolate brown almost black also the saw seems to be using more petrol than normal

 

My thinking is that something is gummed up in the carb and it needs to be strippped and cleaned, however before I get into it has anyone else any ideas or previous experience of a similar problem.

 

I also seem to recall reading somewhere that there is a recommendation to remove a gauze from the exhaust on these saws - can anyone confirm or otherwise please?

 

Cheers

mac

[Caleb]

On ours we removed the metal mesh grid from over the exhaust they aren't needed in this country and have you tried reseting the auto carb?

[MattyF]

Sounds like the spark arrestor ... Have you removed it?if you have not that sounds exactly like the problem.

[MattyF]

I cleaned out the fuel lines and carb a and it left me stumped on husky hedge cutter as it did exactly what you described .... Then realised the bloody thing was still in there !! Took it off and it was spot on

[adw]

By all means remove the sparl arrestor in the muffler, if it is blocked with carbon then there is your problem, if not you need to look else where, running rich would suggest there is no blockage in the carb or fuel system, flooding carb due to the needle leaking, or metering lever too high maybe, the ignition does have a built in govenor, is the air filter clean? as this will make it run rich, did the dealer plug the machine into the auto tune tool and check for fault codes? or update the software/

[muldonach]

On ours we removed the metal mesh grid from over the exhaust they aren't needed in this country and have you tried reseting the auto carb?

 

Th eonly way I know to reset the auto carb is to stick the saw into a big log and run at full throttle for 3-5 minutes. therein lies the problem - it will not run evenly at full throttle but yes it has been tried at full power in a big log

 

Cheers

mac

[Caleb]

Ok thats how I'd reset it so i can see how that would be a problem

[muldonach]

By all means remove the sparl arrestor in the muffler, if it is blocked with carbon then there is your problem, if not you need to look else where, running rich would suggest there is no blockage in the carb or fuel system, flooding carb due to the needle leaking, or metering lever too high maybe, the ignition does have a built in govenor, is the air filter clean? as this will make it run rich, did the dealer plug the machine into the auto tune tool and check for fault codes? or update the software/

 

Will have a look at the spark arrestor - cannot say I have noticed any carbon build up on it but will check again.

 

Air filter is clean

 

no idea what the dealer did or did not do - saw was left with him for several weeks while I was abroad and collected by my other half.

 

cheers

mac

[Stubby]

Will have a look at the spark arrestor - cannot say I have noticed any carbon build up on it but will check again.

 

Air filter is clean

 

no idea what the dealer did or did not do - saw was left with him for several weeks while I was abroad and collected by my other half.

 

cheers

mac

 

You need to be there when he does it . It only takes a few seconds when he has plugged it in . Get him to fire it up and try it .

[MattyF]

It says clean the arrestor regularly in the manual if it's never been done...