OzVMX Forum

Marque Remarks => Husqvarna => Topic started by: Chilly on November 03, 2016, 11:53:57 am

Title: WRK 250 issues
Post by: Chilly on November 03, 2016, 11:53:57 am: Bit of a newbie when it comes to two strokes, have an 89 Husky (Cagiva) WRK 250, pretty much new engine, new bearings, seals, piston, cylinder re done by electrosil, new mikuni TM 38 flat slide. When I check for spark I am getting spark if I kick it over quick enough. Plug is wet if I kick for long enough so it is getting fuel. Carby was jetted to suit by mikuni oz, air screw is 1.5 turns out.

All I get is the occasional backfire. Bike has the original motoplat ignition, magnets are not in great condition, they shattered at some stage and were glued back in. Would this be the most likely cause of my problems?
Title: Re: WRK 250 issues
Post by: bigk on November 03, 2016, 01:01:08 pm: Sounds like a timing thing, perhaps check it hasn't sheared the flywheel Key.
K
Title: Re: WRK 250 issues
Post by: Chilly on November 03, 2016, 01:19:31 pm: Nope, key is good.
Title: Re: WRK 250 issues
Post by: smed on November 03, 2016, 01:41:30 pm: Quote from: Chilly on November 03, 2016, 11:53:57 am

All I get is the occasional backfire. Bike has the original motoplat ignition, magnets are not in great condition, they shattered at some stage and were glued back in. Would this be the most likely cause of my problems?

Yep, first place I would be looking ;),Pretty sure magnets if put in the wrong orientation will not work, IE backwards ;) There is a clue also in " kick it over quick enough" = stator windings or other elec probs, take the lot off & send to SCR Geelong, they set em up on a test rig & run em up looking for problems, tell em the symptoms :)
Title: Re: WRK 250 issues
Post by: 80-85 husky on November 03, 2016, 02:22:26 pm: that's small coil rewinds....I believe ;)
Title: Re: WRK 250 issues
Post by: smed on November 03, 2016, 02:30:09 pm: Correct :)
Title: Re: WRK 250 issues
Post by: Chilly on November 03, 2016, 02:34:16 pm: I'll just wait for the PVL ignition I have ordered to turn up :)
Title: Re: WRK 250 issues
Post by: smed on November 03, 2016, 02:40:12 pm: That's the go ;)
Title: Re: WRK 250 issues
Post by: roon on November 03, 2016, 02:56:30 pm: My near new '89 WRK260 decided to suddenly stop half way across Shallow Crossing, it was a long tow back to Termeil
On tear down I found that the Motoplat ignition had dropped the magnets, can't remember if I fixed or replaced (long time ago) but even then it was a "known problem"....was a great bike though, in fact I saw it advertised on Gumtree about 3 months ago and was tempted to buy it back, but it was sold before I could get a round tuit....
Title: Re: WRK 250 issues
Post by: Chilly on November 25, 2016, 04:56:15 pm: It's ALIVE ;D The new ignition solved all. Big thumbs up to Prime8 Racing for tracking down the ignition for me.