OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Victa Two Stroke Engines High revving Victa..again

Thanks Norm.

Danny

I find a lot of people leave the throttle in the off position after turning the engine off and this compresses the outer
spring and it looses it's tension after time and won't open the poppet valve so you need to pull the spring out
and stretch the spring to a decent length again.

Sometimes the diaphragm stops the poppet valve reaching full throttle so with the carby off and setting the throttle to full throttle
I use long nose pliers to pull the poppet to full throttle while the back of the carby is off , then while you are holding the poppet
valve open put the back outer spring in and clip on the back cap.


Cheers
Max.

These days I just cut the long spring in half and use the halves on each side, seems to work ok for me. I don't bother with the governer I just use the throttle cable to control the revs. There is a lot of smoke and mirrors and voodo magic pedalled around these carbies

Have you tried a short spring in place of the long one NormK?

I hear a few people say they prefer the older Victa carby because they don't understand the G4.

The newer diaphragms are made to move a lot better than the old flat diaphragm ,if I didn't hold the poppet out
when fitting the back cover with the flat diaphragm it had no slack in the diaphragm to move.

Another problem is when people mix and match parts ,seen the wrong poppet valves used a few times (the poppet for a Vortex
used on other mowers)

Cheers
Max.

Hi MF,
As I said lately I have just cut the big spring in half and use them on each side

I fired this mower up last weekend, first time since April, and it started pretty easily. I know your'e supposed to drain the fuel when it goes to sleep for a while but I'm too lazy/stupid.

It didn't have much fuel in it so I just topped it up afresh and did about 40 minutes mowing and just as I was nearing the finish line I sensed it slowing down (it doesn't have much/any throttle response anyway) As I finished off it just slowed down and stopped quietly with no fuss. I didn't try to start it again.Still had plenty of fuel.

What do you think?

Danny

Hi Danny,
your float needle has stopped the fuel flow

Is this due to the poor prep during the down period Norm? This is the stainless needle with the return spring and hasn't given any problems before. I'm not looking forward to taking the primer cover off of this as I think the thread for the main jet is a bit iffy!

Danny

Hi Dan,
The fact it was working means it was fine, nothing to do with the lack of use, they are just a bastard design made worse by Chinese manufacturing. Obviously the needle has stuck in the seat and the little return spring can't dislodge it. This is what I have been trying to solve over the last week or so. I have found that reaming the seat is a 50/50 improvement, but no guarantee

Hi Danny and Norm,

If you haven't tried to start the mower it could be a few things ,if it's the needle sticking ,when it stopped you could have put
some fuel in the spark plug hole and if it started then it's a fuel problem , fuel flow can be restricted from a bad fuel filter or
a restricted breather on the fuel cap.

Spark plugs can fail when they get hot and even new plugs fail occasionally.


Cheers
Max.

And this is the problem with the design of these things, you can pump on the primer and you have no way of knowing if fuel is flowing through the float switch, that is of course unless it is pouring out the primer and by that stage you now have a flooded motor and that needs to be delt with before you can get it started. One way to check fuel flow is with the tap on pull the hose off the carby. If fuel runs out the hose it is usually the float needle. Then as you say could be the breather in the cap, but in all my years I think I have only had that happen twice on a Victa. And if that happens the revs usually rise as the fuel flow leans out. With the float needle sticking it stops the fuel quickly so the revs don't rise because it doesn't get time to lean out
Dan, if you get stuck with the main jet screw (pretty awful design) I can send you a few bodies reluctantly through Aus Post, but I hate being ripped by them

My 3 cents (because of inflation) is that it's a dead plug.

Good call there BT, I have had 3 of them in a row recently

I will check the plug although it is the one that started this thread a few months ago when I left out the diaphragm metal plate and this new plug nearly caused the motor to self destruct.

I was in no position to check anything at the time due to being black-laquered from my first hour and a half of mowing and whipper snippering for about 3 months!

Danny

Bingo bigted! This plug that was new at the beginning of the year was completely deado. I did get a run out of it since the time of my previous posts. I've got about 4 of these Champion BJ8s all useless.

I robbed an RJ19LM from a 4 stroke and apart from verging on being too long to get the plug lead on works a treat. I even managed to get it to run a bit slower...or did I imagine that?

Danny

Yep, you imagined it running a bit slower.

I did a couple of PT's recently and they are perfect. Start first pull and idle as they should. They are so good if the float needle and primer cap work, but it is such a crap shoot, for everyone I get to work I can usually spend hours fighting and swapping primer caps 15 times before I get a pair that will work consistently.

What I've only just worked out with the 2 running Victas I have is that some of the high running speed problem seems to be caused by the cable control having a mind of it's own and just moving independently of any human input.

One of them, a Tornado I think, (Blue 2 stroke) is particularly good at this...and I haven't even messed with it!

Danny

Hi Danny,
if you tighten up the screw through the filter housing you should be able to stop the lever moving too much