Thread: Wipper Snipper motor wont go !!

hi
I too have a lawn mower that is a persistant pain in the A$$, what I do is change the spark plug every now and again and spray loads of "Start you Bastard", (yes it's actually called that - from supercheap) into the foam filter and away it goes, Honestly if you do this and is still doesn't start it's not going to!

If it still doesn't from what you say either you are priming too much fuel into the carby, (flooded it) my mower says three primes but if I do more than 1 it floods or the carby has some crap in it. The blocked carby sounds more likely thought.
I havent really got any suggestions about unblocking fuel lines/crabys except an airline or worst case a strip down eeek

Many whipper snippers have a primer pump to pressurise the carb for startup.
Biggest problem normally blocked air filter,2strokes cant handle it,especially little ones.
Carboned up muffler is worth a check too.
Unless its an expensive snipper not worth havind work done except for a service.
If you check the US website for the brand you should be able to download the operators manual.
SAME GOES FOR ALL TOOLS GUYS!!!!! VERY HANDY BIT OF INFO TO REMEMBER!!!
US websites seem to carry all operators manuals free online,perhaps its a legal issue or other countries havent caught up yet.
Andrew

I went thru this last weekend , i tried cleaning the plug but would still only fire briefly then die. I ended up removing the air filter and muffler as it was filling with fuel and was causing it to not allow exhaust out thus preventing any fuel intake. Once apart i started it after about 20 pulls and it eventually started then when it was hot i quickly put it back together and started it, will see if it starts ok next time.

butchery time..

pull the air filter, dump the muffler, pull the spark plug clean it up and pull the rip cord to defuel the cylinder incase you flooded it. (put the plug in the lead and check the spark while your at this stage)

Preheat the plug with a ciggerette lighter or similar install it and give it a sniff of brake clean, areostart, or start ya bastard. rip the cord with the choke off and full noise selected.

If that dont get a sign of life out of it the carbies probabley shot Strip that if your game and get the gunge out of it and keep an eye out for the diaphragm if its stiff or torn replace that

.... once it goes let it warm up then put it back together again muffler first and try it again if it dont run then the mufflers shagged, blow it out with HP compressed air and that should sort that.


should take you all of about 30 minutes to do that.

Originally Posted by Blknight.aus

keep an eye out for the diaphragm if its stiff or torn replace that

Also check that the crankcase pressure gallery into the carby isn't blocked. The crankcase pressure runs the little fuel pump (diaphragm described above) in the carby. Does the carby have hi/lo mixture jets?
-- If so, remove them and check for dirt in the jets.
-- If not, the butterfly shaft is also acts the main jet needle. Could have a bit of ***** in it.

If it fires with fuel on the plug, then it is definitely a fuel problem and the above should sort it out.

All the above could help.

Have you used fresh fuel in the tank. 2 strokes are fussy on this from what I have found.

Also is there a filter on the outlet from the fuel tank? Some units have one attached to the fuel line inside the tank. The filter could be super blocked.

It will be a matter of trial and error.

I use a Stihl unit and made the mistake of fiddling with the mixture and idle speed screws. It took me hours to get it right after that. The manual is a big help here but I did not have one.

Originally Posted by barryj

All the above could help.

Have you used fresh fuel in the tank. 2 strokes are fussy on this from what I have found.

Also is there a filter on the outlet from the fuel tank? Some units have one attached to the fuel line inside the tank. The filter could be super blocked.

It will be a matter of trial and error.

I use a Stihl unit and made the mistake of fiddling with the mixture and idle speed screws. It took me hours to get it right after that. The manual is a big help here but I did not have one.

I was waiting for someone to say fuel.

1. New clean fuel/oil mixture (older fuel can go off and the oil can separate from the fuel)

2. Replace the plug, dont just clean it and dont earth them out anymore as it can damage the CDI unit in most of the modern ignition systems in most new type 2 strokes.

3. check the filter in the tank and the fuel line is not cracked and is a tight fit on the filter and the carbi or primer.

4. If it has a primer bulb that could be cracked as well

5. Carbi diaphram may be hard or cracked so carefully pull it apart and replace it, they cost about $4.00 and while it's apart clean it out by removing the adjusting screw and venturi and blowing them out.

6. Clean the spark arrestor in the muffler if it is still there, most people remove them but they do stop fires when your working in dry grass so if you can save it it is worth it but it's not the end of the world if you dont and mufflers can coke up as well so take it off and check it in you camp fire/firedrum/combustion heater or what ever you can have to clean it out.

DONT USE AEROSTART/START YA BASTARD on any engine unless you dont want to keep it as it is ether and has no lubricant and stuffs rings quicker than anything.

If you want to test the plug, it has to be done with a plug tester with a resister and capacitor between the ground and the plugs earth to stop spiking the CDI unit.

If you want to prime it manually, remove the plug and put a few drops into the cylinder not on the plug as wetting the plug stops them from working.

If it has no or low compression it wont prime either as well as if the case gasket is cactus it wont prime so check that as well.

Plenty for you to do, have fun.

Setting mixtures is a piece of ****, first, find the centre so count the turns and take it to half way on the high and the low screw, then once you get it started adjust the low screw with about half throttle until it sounds nice and then adjust the idle so it idles then hold it flat out and where it sounds like it's in it's sweet spot, back it off about 1/8 a turn so it just sounds like it's labouring or else it will have speed but no balls.

Thanks for the Help Everyone i will give it a go tomorrow.