• Husqvarna Motorcycles Made In Sweden - About 1988 and older

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

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    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Non start - 1979 125cr - help please

R

Ruairi

Husqvarna
AA Class
The engine has been rebuilt. Compression is good.
Good spark at plug. Fuel present in float bowl.
Fuel poured into spark plug hole enables engine to start briefly and there is a “phut” through the carb as it dies.
I have kicked it over and over and it’s not even trying to fire.
I am presuming the timing is out? Unfortunately the link for the ML/MK Engine Manual available on this site is corrupted so I am a bit stuck at the moment because I have not got a clue re Motoplat ignition.

Any advice or tips very much appreciated.

May need a set of experienced eyes on it so any advice re good workshop in England would be most welcome,,

Thank you
 
I'd start by carefully cleaning the carb including removing the jets, and yes, again, if it's already been done.

Sounds like maybe a blocked pilot jet (and/or starter jet if Mikuni)
 
Hi Markt2
Its a bing 84 but yes will strip it down and go through it.
This episode may encourage me to go Mikuni !!
Thank you
 
Thank you guys all very much appreciated. Shed time booked for later in the week so i will let you know how i get on.
 
Longshot, but check that the reeds have not glued themselves shut. If this is a resurrection of a long-unused bike, I have seen this! Reeds varnished so badly that they won't open. You can have good motor, good compression, good spark, good timing, good carb, but it just won't fire. Fooled me well, that one.
 
Carb has been re-stripped, blown through with air gun and I am convinced no blockages. Bike will not start. So i have removed the reed valve block. Nothing looks to be gummed up. All the bits open if i prod them. That said reed valves are new to me so i am unsure how flexible they should be. Mine open and snap shut. Not sure how old these things are. £56 to replace when i possibly dont need to.Damn frustrating.
 
Thankyou Vinskord for putting up the ignition timing pages. Thank you Visiteur1948 i will look to see how my Bing is set up. Justintendi yes i will be replacing with Mikuni at first opportunity. What size Mikuni and jetting are any of you guys using onyour125 Husky please?
Its shed time later so i am hoping today us the day it fires up!!!
 
for me BING 84 is perfect with new parts main jet and needle jet 2.80 !
but is possible ! CARB MIKUNI 125 YZ or 125 CR HONDA KEIHIN !
keihin 35 sur 125 ebay.jpg
KEIHIN 35mm
 
I would check for a massive airleak...as that will cause it not to start even if everything else is correct...ask me how I know !!
 
Ok, How long did it run for, when you got it running, 10-15 seconds, or enough to rev it up?

If it ran for a bit & then died , then ignition & timing don't sound like your problem.

Sounds like carb, or air filter clogged, i had left a rag over the air box on the 2 stroke street bike once..duh


Start from the beginning again before you try starting again.. some of these may sound dumb... double check
them any way..

1) verify you've got a nice blue spark, re-check coil wire & connections , spark plug cap, did you re paint the frame or have it
powered coating, if so check the ground to frame (coil mount).

2) Pull the pipe off, see if there fuel in the cylinder, check to make sure the piston not in there backwards.

3) Put in a brand new plug, even if there's a new one in there

4) Check your kick switch/button, disconnect for now..

5) Check you carb slide, does it open & close completely & not hang up, when you open & close the throttle?

6) Petcock/ fuel tap, does it work correctly on & off, flow good?

do those simple things first, then let us know..


Husky John
 
I say again, do a leak down test before doing anything else . Air will not only leak past crank seals but also reed gaskets, exhaust flange gasket, base gasket and past the head. If it is a big airleak it will not start.
 
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