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Thread: Temperamental 2 stroke engines.

  1. #41
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    20,184
    The only time my Husqvarna chainsaw has failed to start easily in the last twenty years was when the throttle plate came off. I wish my four stroke ride on lawnmower (B&S) started that easily!
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  2. #42
    Join Date
    Oct 2006
    Location
    canberra
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    Quote Originally Posted by JDNSW View Post
    The only time my Husqvarna chainsaw has failed to start easily in the last twenty years was when the throttle plate came off. I wish my four stroke ride on lawnmower (B&S) started that easily!
    Old huskys never die. Mine just keep getting better 16 husqvarna saws at last count

  3. #43
    Join Date
    Feb 2013
    Location
    Ballarat,Vic,Aus
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    2,145
    Quote Originally Posted by 460cixy View Post
    Old huskys never die. Mine just keep getting better 16 husqvarna saws at last count
    Well I have a nice straight shaft Solo brush cutter.... It's the biggest POS ever. It's a bitch to start (if it starts). And never seems to want to run right... It's a quality modern german made machine...

    Now ... I have an old Victa super 600 with the power torque commercial 2stroke on it... It's done so much work, the rubber has worn off the wheels....the carby diaphrams and orings are rock hard (to the point with it pretty much leaks). It ALWAYS starts and runs bloody lovely ... heaps of power.

    I recently purchased an old ProMac 650 chainsaw.... You know, other than it has the most horific thirst for petrol and chain oil.... It's bloody brilliant. Always starts ... always runs perfectly.

    Why did they get it right 20+ years ago ... but can't get it right now

    seeya,
    Shane L.
    Proper cars--
    '92 Range Rover 3.9V8 ... slugomatic
    '92 Range Rover 3.8V8 ... 5spd manual
    '85 Series II CX2500 GTi Turbo I :burnrubber:
    '63 ID19 x 2 :wheelchair:
    '72 DS21 ie 5spd pallas
    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual :zzz:

  4. #44
    Join Date
    Oct 2006
    Location
    canberra
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    2,715
    I not long ago had a bunch of brush cutters from a hardware chain that all came back for refund and got passed on to me by a mate to save them from the tip every single one of them had incorrect fuel settings making for some pretty ordinary to use and others un usable at all all had some form of tamper proofing on the screws some easy to defeat others impossible. Wonder how many new machines went straight to the bin?

    Now don't forget Malcolm's mower tax is coming too meaning all new machines have to pass emissions standards one good thing that night come of this is cheap China made junk might disappear but to pay for the testing and seting up of this scheme/scam is a tax on all new machines sold. This covers all non road going spark ignition engines

  5. #45
    I can't say I'll miss 2 strokes too much when there gone, and I think they are well on the way out. must have owned over 20 2 strokes over the years: whippers nippers, motorcycles, lawn mowers, etc over the years. All bar a few have given problems at some time or other.

    They are overly sensitive to fuel mix, altitude, fuel ratio, air temperature and humidity, engine temperature. Unless light weight is paramount IE you carry the engine such a a chainsaw..then I wouldn't buy one again. The world is moving away from 2 strokes..horrible fuel consumption, noisy, smokey, wear out too quick, fuel separates, leave a fuel/oil residue if not drained.


    Clive

  6. #46
    Join Date
    Oct 2006
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    canberra
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    Quote Originally Posted by clive22 View Post
    I can't say I'll miss 2 strokes too much when there gone, and I think they are well on the way out. must have owned over 20 2 strokes over the years: whippers nippers, motorcycles, lawn mowers, etc over the years. All bar a few have given problems at some time or other.

    They are overly sensitive to fuel mix, altitude, fuel ratio, air temperature and humidity, engine temperature. Unless light weight is paramount IE you carry the engine such a a chainsaw..then I wouldn't buy one again. The world is moving away from 2 strokes..horrible fuel consumption, noisy, smokey, wear out too quick, fuel separates, leave a fuel/oil residue if not drained.


    Clive
    Ridden a modern four stroke dirt bike lately ? They make two strokes look as reliable as an anvil with there delicate valve trains and cylinder heads trying to match two stroke performance and failing badly but people lap them up

  7. #47
    No I haven't.

    Used to own a few MX/Enduro 2 strokes bikes a long way back. As far a 2 strokes went they were some of the better ones I've owned. I also owned a rotary disk valve 250 side by side KR250. Horrible engine.(fun to ride not own). Lighting fast narrow powerband. Came on for a few thousand revs, nothing either side. Would have to be the most temperamental engine I've ever owned too. Hard to start, always, impossible when it was just warm. The read vale one pot moto engines were superior.

    I will grant 2 strokes with respect to power to weight are unbeatable by a Normally Aspirated 4 stroke. It wouldn't surprise me either if they lacked low down torque too compared 2 stroke
    I can only surmise in trying to match the performance of the 2 strokes, they have tuned and lightened the whole valve train, reciprocating parts, etc. to the point of unreliability.
    Performance is everything to the dirt bike crowd. I guess they'll tune em up as far as the rider will put up with, before maintenance, and other problems hurt sales.


    I still think I go 4 stroke (a lower power for reliability) except a for a chainsaw. But I have a feeling, or at least the home size ones, will be all battery in some time. Electric motors suit cutting.


    Clive

  8. #48
    Join Date
    Jan 1970
    Location
    Narre Warren South
    Posts
    3,436
    Quote Originally Posted by clive22 View Post
    But I have a feeling, or at least the home size ones, will be all battery in some time. Electric motors suit cutting.
    With battery powered items it's a pain when in 5-10 years time the battery karks it and you can't get a replacement or battery technology has moved on. Re-populating the battery works out more expensive than a new tool so you throw it away.....

    Mind you...... I have problems with a Homelite chainsaw at the moment. Starts & runs OK but if you turn it off it will not re-start until stone cold, seems to be the coil pack which may be obsolete from an internet search ! Still usable but if it stops it's game over till it's cooled.

    A win recently was an old Ryobi whipper snipper (dark green). $5 at a trash & treasure market. fuel pipes were brittle so replaced them and it runs like a new one now.....Not that easy to start because no primer bulb but 4 or 5 pulls on full choke and off she goes.

    I have a few other Ryobi whipper snippers that have been thrown out because they wouldn't run (start OK). Always a blockage in the carby, take the carby apart clean it out (never seem to actually find anything) and it then runs OK.



    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '60 SII 109 ute (gone)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

  9. #49
    Join Date
    Oct 2006
    Location
    canberra
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    2,715
    Could be the coil check for apart straight away once it won't start what model is it?

  10. #50
    Join Date
    Jan 1970
    Location
    Narre Warren South
    Posts
    3,436
    Quote Originally Posted by 460cixy View Post
    Could be the coil check for apart straight away once it won't start what model is it?
    It's an i3850b
    Found a coil out of Hong Kong but it wasn't listed for this model. Need to take it apart & check to see if it looks the same.

    Colin
    '56 Series 1 with homemade welder
    '65 Series IIa Dormobile
    '70 SIIa GS
    '76 SIII 88" (Isuzu C240)
    '81 SIII FFR
    '95 Defender Tanami
    '60 SII 109 ute (gone)
    Motorcycles :-
    Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C

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