OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Victa Two Stroke Engines Victa Twin: No Spark

I managed to fix the problem by revving the guts out of it.
it sounds unreal. Its my new ringtone. pity my lawn doesnt need mowing.
I didnt really want to pull it all apart again

Arh yes I had all the faith in the world you would work it out.Most likely just some junk caught up somewhere.Good Work.

Soooo,

I now have spark again - cleaned up the flywheel again and bright blue spark. Not sure what's going on though - I can only get it to run for 10 seconds or so before it backfires and dies. It starts pretty easy now but dies soon after BUT it runs quite well on just the rear cylinder with the front lead disconnected. Not sure what the issue is now but it's going to have to wait for another week before I get the chance to look at it again ...

Pete

I'm getting confused now I think we have two people with two different twins with two different problems.

your still helping both mate , was pete's 1st i think though , but yes 2 different machines now

OH bugger I hope I was giving the right information to the right person.I should really check names of whom I'm answering.

all good mate. you are answering each question as they come up so all advice thus far is right.

Thanks,
Pete

Cool thank goodness for that.I'd hate to be giving the wrong advise to the wrong person.

Hey Blumbly and anyone else who may be able to weigh in on this ...

After much trial and error I have found that the front cylinder is flooding.

When the front spark plug is removed the machine starts first pull and runs very smoothly on the rear cylinder alone but when the front plug is installed it is hard to start (Takes several pulls) and then starts popping away (Fuel igniting in the exhaust) and dies.

This is as far as my knowledge on these engines takes me. How does this machine spread the fuel flow to the 2 cylinders? Any suggestions for me?

(Mods; perhaps the title of the thread could be changed to Victa twin flooding front cylinder???)

Thanks,
Pete

OK the fuel distribution is the same as any other two stoke which works,from the compression of the rings.So you saying it's flooding in the front cylinder which tells me it is getting the fuel.Which doesn't sound like a problem.What sounds like the problem is,is a weak coil.Which is not uncommon with the Twins.However this would be the first one I've herd about being the front cylinder.Unless someone has changes the leads around (which really isn't that hard to do).I guess you could check the lead on a multi meter,but I can't remember what the reading would be.
Failing the leads being a problem.I'm sorry to say but it could well be the coil,they did have problems with these coils and it was always a week spark to one of the plugs.Usually the back,but I guess even though I've never herd of it could well have been the front too.
Just a pitty you weren't closer or we could try one of mine on it.

i'll have a look around here too if you think maybe it might be the problem ?? had a really dead supreme here ages ago but im sure still had strong spark , would it be the same ? took all the bits off of it as base was badly broken and engine was hmmmmmmm fried

Thanks guys,

I was hoping there was maybe a little trick with the fuel distribution that would fix it up. I tested the spark from the front plug while the engine was running on the rear cylinder. It was very consistent but perhaps it wasn't a bright blue spark (I'm actually a bit colour blind).

Vccomm; if you do happen to have a coil lying around I would very much appreciate it if I could borrow it to test it out and if you're open to selling it I'd definately buy it off you if mine is cactus. I'm in Elizabeth so not far from you either.

So disappointing. I get most of my enjoyment out of reviving old machines that had been declared dead by their previous owners - I don't like to be beaten! This one was in a TERRIBLE state when I got my hands on it but now it's SOOOOO close I can taste it. Just can't finish it off!

Thanks,
Pete.

Incidentally the machine I am playing with is the red 500 with points and condenser.

Thanks,
Pete

sure , i'll have a look around for you , cant promise but i think i kept it
and yeh wave out the window and i could see you from here hahahaha if i do have it so will you , im never gunna use it i think , you tried swapping plugs front to rear ? might be that easy could just be a weak plug even if they are new

Thanks greatly.

I thought it may be a weak plug so I changed the plug with another new one, then another new one. Unless the whole box if faulty I don't think the plug is to blame unfortunately.

I'll have a play on the weekend and see if the leads have been swapped around. I'll try clean up the contacts AGAIN too.

I know one of the blokes that works in the Caltex at Virginia has 2 almost complete twins in his shed and a 3rd engine. He offered me them a while back but I had too much to do already so I turned him down. I since lost his number and every time I call the service station he isn't there ... A conspiracy isn't it.

Pete

Actually try this and see if it happens in reverse.Where the plug wires go into the coil.Unscrew them (just with you fingers) and put the front lead in the back position and vise versa and see if the front runs and the back doesn't.That will confirm if it is the coil.As both cylinders fire at the exact same time so it won't do any damage.Do that I'd be interested to see what the result is.

no problem , was worth a shot . yell if you get them hahaha i might buy one from you too , i think its going to be my turn soon to play with one as the one i did have was just beyond it and for me to say that it WAS dead
i'll be home all weekend too so yell if you need a hand

now theres a good bit of thinking !! plug wire i have too (if i can find that !)

hmmmm, so here's a bit of a puzzle.

I couldn't get the leads to budge from the coil so I simply plugged the front lead to the rear cylinder. It worked fine on the rear cylinder with the front plug removed.

I installed the front plug and NO GO

I plugged the rear lead into the front cylinder (VIA a home made extension lead). Plenty of bright blue spark but NO GO

I removed the rear plug and left the front plug in play powered by the rear lead. NO GO.

I tested for spark and found that the front lead would only spark when the rear lead was attached to a plug and was sparking against the body. When it wasn't I would get no spark from the front lead (irrespective of what cylinder it was plugged into and visa versa.

At this point I am pretty confident that my problem is now NOT the coil but either the carby flooding the front cylinder (Unlikely) or something inside the front cylinder that is sucking too much fuel through. As compression is OK and not too high or too low on both cylinders I don't see it being the rings or the decompression valve. What else could I be facing?

Is there something on the inlet manifold that directs fuel flow??? I am completely lost now. This machine has me stumped but I WILL NOT LOSE! I will not be beaten by this thing. Regardless of how much it wants to be scrapped!

Thanks in advance for any help!
Pete.

tried changing decomp's front to rear too ? checking if they are working fitted , enough vacuum there ? i dont have a book here or a supplement but i cant see how they would have something to direct fuel . blocked exhaust port or partly blocked muffler