aametalmaster
Member
- Messages
- 763
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- Salem Ohio USA
Check your fuel line maybe its soft and might be sucking shut...Bob
- Thread starter marky2222
- Start date
Yes but rare.
On most small engines as these, the flywheel is located on the end of the crankshaft either on a pentagonal section formed on the end of the crankshaft, or a tapered end with a keyway, or very rarely a spline.
The only way the timing could be out is if the flywheel had been removed and replaced x degrees out on the pentagon, the key has snapped and the flywheel moved on the taper, the spline type usually have a master spline so will only fit one way.
Could it be wasted spark ?
No.
Wasted spark refers to a spark at every top dead center where one spark is not igniting anything.
As has been mentioned a two stroke fires at every top dead center, ( just before actually ).
A single cylinder two stroke won't have a wasted spark system.
A four stroke single can have a wasted spark system, in fact the plug sparking exactly the same as a two stroke, however one spark ignites the mixture at top dead center the end of the compression stroke, the other spark is at top dead center on the exhaust stroke and is therefore wasted.
Hope this helps.
before i so your post i did put abit of fuel down the spark plug hole and replaced the spark plug i then pulled the cord yet still and nothing but when i removed the plug again and brought the piston back up a very small about of grey smoke came out and the piston head was dry again so it must be buring it off but still not enought to fire it up
Leave the plug out overnight so hopefully the bore will be clear of fuel, have a clean dry plug ready.
Next day, before priming etc. turn the engine over slowly several times with the plug out, again to get rid of any excess fuel.
Put the plug back in, prime it up, put the choke on if it has one, open the throttle wide and give it six or seven quick pulls on the cord, if it doesn't start, whip the plug out, it should be now be wet with fuel.
If it isn't you have a fuel problem, if it is you may have an ignition or compression problem.
I haven't worked on one of this make so my suggestions are a generalisation.
One other thought, is there any sign of reed valves in the induction tract ?
the snooper
getting older by the day
- Messages
- 21,067
- Location
- Hull UK
on a 2stroke engine the crank case has to be air tight so if you have removed a cover exposing the conrod make sure it is sealed again also if it has been run with no oil take out the piston and inspect it for damage or piston rings stuck tight in the piston
once you know the piston rings are free and the cylinder isnt damaged you can move on
dont be fooled by sticking your finger in the plug hole and feeling some compression it may not be enough
unfortunatley those McCullouch's are known as disposible as the cost of the parts are rediculas and quite often just as cheap to buy another one
once you know the piston rings are free and the cylinder isnt damaged you can move on
dont be fooled by sticking your finger in the plug hole and feeling some compression it may not be enough
unfortunatley those McCullouch's are known as disposible as the cost of the parts are rediculas and quite often just as cheap to buy another one
They're doing them for £50 at Argos right now. Can't get the link to work Certainly worth a thought if you wanted a McCulloch strimmer and were tempted to spend anything on spares to get one to work.
From the web page
"* Please note item 7304022 has previously been on sale at £44.99.
Current selling price valid until 29/07/2011"
the snooper
getting older by the day
- Messages
- 21,067
- Location
- Hull UK
hey guys thanks again for all your help i still havent got round to getting any pictures but i now definitely know the engine had been run on straight petrol as the bloke said he put the 2 stroke mix in the 4 stroke genney and clogged his plug up and the straight mix in the 2 stroke strimmer he run it for a while then it just cut out which would explain the stiffness when trying to pull but now i have the pull start free and the engine turning over what could be damged to cause it not to start i know its only a cheap jobby but i am determined to get it working
but i have so on plenty of videos were there saying if this happens even if it was something like a stihl i would still not be worth trying to fix cheers
mark
but i have so on plenty of videos were there saying if this happens even if it was something like a stihl i would still not be worth trying to fix cheers
mark
GeorgiePorgie
pre-moderated
- Messages
- 957
This would have badly pitted the piston head,hence why you say you could see a lot of black carbon and might be due to why its not firing up? ie petrol soaking/flooding the chamber
Having been run on neat petrol till it siezed, the favourite problem with two strokes is cylinder bore / piston skirt damage.
As Snooper suggested, remove the piston and examine it and the bore.
You may see spots of ally ' friction welded ' to the cylinder bore.
You may also find broken rings or the rings stuck in the lands where the ally has flowed as it siezed.
Nothing to be lost by stripping it further, at least you will see what running without oil does.
