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#Post#: 90234--------------------------------------------------
Rebuilding Small 2 strokes
By: rangerovering Date: July 2, 2014, 4:25 am
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Thought I'd start this one as I am about to rebuild a Husqvarna
232R strimmer which is an absoloute bastard to start but once
hot is great. New piston and rings are ordered (they come
complete so for 18 squids it seemed reasonable). Pictures will
be up as I go, hints tips and suggestions most welcome as well
as your own projects - I'm good with 4 stroke but never played
with 2 stroke engine until recently!
Watch this space....
(Mods if this section is wrong please move and advise)
#Post#: 90240--------------------------------------------------
Re: Rebuilding Small 2 strokes
By: strang Date: July 2, 2014, 6:47 am
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[quote author=rangerovering link=topic=8322.msg90234#msg90234
date=1404293124]
(Mods if this section is wrong please move and advise)
[/quote]
Fine by me - its what this section is for! (I hate 2 strokes
though!!)
#Post#: 90241--------------------------------------------------
Re: Rebuilding Small 2 strokes
By: Jackual Date: July 2, 2014, 6:55 am
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This is my absolute forte, I love working on small engines. Good
tip to compress the rings when fitting the cylinder barrell is
to use wide cable ties around the rings, then once the piston
and rinds are fitted, cut the cable tie away :thumbs:. The rings
are pretty easy to fit, being so small they are easy to flex
wide enough to fit onto the piston with your finger tips. Word
of warning about Husky self tapping screws, They are shit and
tend to strip the threads upon replacement, Some repair kits are
available with oversize screws if you do end up with a stripped
thread or two.
I've always got something in the shed with a small engine,
usually perk jobs, at the moment I have to local Marae's John
Deere X595 in for a cutter deck re-build, replacing all the
spindle bearings and idler pulleys.
#Post#: 90245--------------------------------------------------
Re: Rebuilding Small 2 strokes
By: rangerovering Date: July 2, 2014, 8:50 am
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:thumbs:
This was an ebay special, "sold as seen no time to test". Got it
for £50 delivered which seemed fair, at that money I could still
break it and not be out of pocket.
Got it home, buggered about for a while then tried a new plug in
it. Few pulls and it spluttered into life >rock< Once sorted
out with a harness and line head off I went and its done a good
few hours work since purchase.
Since using it and getting a reasonable state of tune on the
carb its proven to be great once running and warm, but shit to
get started when cold. So as a wee side project to waste/invest
money on I have progressed towards a rebuild. I like the machine
and its ideal for my needs, so to me its worth the effort.
#Post#: 90799--------------------------------------------------
Re: Rebuilding Small 2 strokes
By: nickjaxe Date: July 16, 2014, 4:46 am
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If its still hard to start after your rebuild...take out the
plug...inject a bit of mixed fuel/oil and try again.
Nick.
#Post#: 90802--------------------------------------------------
Re: Rebuilding Small 2 strokes
By: rangerovering Date: July 16, 2014, 6:37 am
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Cheers Nick. Have been using it a bit and it is running quite
well, new piston and ring have arrived but I want to do a
compression test first before rebuild - partly because I'm
interested to know if it is worn out and what improvement the
new one will give, and also because there is a possibility that
the carb may need a rebuild as well. Will update when I have
more info
#Post#: 91878--------------------------------------------------
Re: Rebuilding Small 2 strokes
By: fuckwit Date: August 15, 2014, 1:29 am
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I've Stihl Strimmer and have alwasy just fired a lump of Bradex
in it, especiailly at the start of the season with stale petrol.
This trick has started to fail me as it'll only run at high
revs, so I assume the carb idle jet is gunked-up with stale
two-stroke mix. Don't fancy strippping it so will try soem carb
cleaner in the intake.
#Post#: 91884--------------------------------------------------
Re: Rebuilding Small 2 strokes
By: rangerovering Date: August 15, 2014, 2:55 am
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Well I took it apart (which is pretty easy all just screws) and
have found the thrust of the piston has polished up the cylinder
nicely. New piston with ring ready to go in, bought a honing
tool for £7 that should fit down the bore and de glaze it.
Still got a sneaking suspicion the carb will need rebuilt as
well but the kits are about £8 so not too worried. Will get some
photos next week when I get an evening to put it back together
>rock<
#Post#: 91899--------------------------------------------------
Re: Rebuilding Small 2 strokes
By: nickjaxe Date: August 15, 2014, 11:46 am
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Will only run at high RPM...had a 2 stroke outboard that would
only run at high RPM...turned out to be the fuel
pump...diaphragm had a hole in it...letting neat fuel into the
crankcase...the engine could cope with the excess fuel at high
RPM but not low RPM...
#Post#: 92461--------------------------------------------------
Re: Rebuilding Small 2 strokes
By: Jackual Date: September 1, 2014, 9:59 pm
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Go steady honing the cylinder, they only have a thin layer of
hard nikosil and then you're through to the soft aluminium, Once
the nikosil has worn through it just tears up the bore once
running. I never hone the cylinder when replacing rings, just
put new rings straight in, its only a 2-stroke so ring/bore
slubber isn't an issue.
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