Another roadside find, plenty of rust but runs OK for a few seconds with a bit of fuel tipped down the carb throat.Came with a reasonable catcher and a full tank of fuel.

Did a search to find out what it is and although there's an number of photos of Victa Corvette 700s they are either two strokes or unlike this one, some of the ones with red covers had the carbs and mufflers on opposite sides to this.

Any clues as to why I can't find anything similar?

What does DOV mean - double overhead valves?

That one came out in about 2012ish. I remember seeing an ad for it in a wheels magazine I have around here somewhere, it was when the toyota 86 first came out.

Yours originally had a red cover as well, it clipped into these slots on the cowl and were fairly easily pulled off by low hedges.

Don't think they sold many of that model as most people were smart enough to go for the mustang at that price range

At the time, they were above the side engine quantum engined corvettes, now they have OHV briggs on the corvette range (muffler on opposite side

Dov means direct overhead valve - basically it is long cantilevered lever arms for valve actuation.

Thanks for all that info Tyler.

Interesting to see the video, all that hype about the "direct overhead valve" system :-) Looks like an overly complicated way to do things, reminds me of some "high cam" designs of the 1920s, just adding an extra gear to drive the camshaft.

This machine will be getting flogged if/when I get it running properly, no intentions of restoring it to concours condition. It will have to survive without the clip-on cowl cover.

Gave the carb some very sorely needed TLC, put an in-line tap in the fuel line, sharpened the blades and the Corvette is now performing extremely well.

One of the springs associated with the choke crumbled into dust and I was about to remove all the throttle governing system and just have the throttle cable directly control the throttle butterfly but it is running perfectly without that spring.

I find it very satisfying to be able to save abandoned machinery from landfill, even if just temporarily, for minimal cost and a bit of time and effort.

One thing I haven't seen on any of my other B & S motors is the spring loaded tensioner which I presume automatically adjusts the choke when the ambient temperature is low.

The deck is rather rusty. Any ideas what other Victa (or other) decks could easily accept this motor?

I think the Razor alloy deck takes the longer shaft motors like the Tornado. Not sure about the Mustang from the same era.

Been using this mower a lot, goes well.

Only problem is the way the blade carrier is mounted. There's a two eared thingie on the end of the crankshaft which fits into a couple of shallow grooves on the carrier and it's not possible to see or feel if things are lined up exactly when tightening the bolt. I take off the carrier to sharpen the blades when needed and too many times the carrier has come loose and rattled around next time I mow because it wasn't perfectly located, and this is chewing up the grooves.

Right now it is sitting perfectly and I don't want to touch it, so can't see if the crank end bit can be removed and replaced with some more common part and married to a more common blade carrier.

Anyone can advise?

They are a minor PITA but you have to just put them on with extra care such as carefully checking it's located fully as you tighten with the other hand.
Once tightened, spin the blades slowly by hand -making absolutely sure the spark plug boot is well away from the plug end, and look carefully the blade carrier is spinning true.

As MF said it just takes one hand to hold the plate and the washer into position and when you turn the washer as you
put the washer into position you can feel the washer lock into place then tighten the bolt with your other hand holding
a rattle gun.



Cheers
Max.

As Max said very easy to get them locked up using the rattle gun. I just put the blade carrier on, put the washer on over the tabs holding the washer in place, start the nut then put the socket over the nut and push it on so the socket helps hold the washer and the pull the trigger on the rattle gun, job done.

With the Sanli I did recently, hand tools worked fine as they use a 17mms bolt along with two 16mm bolts either side as well as a D shaped raised bit that keys with a corresponding D shaped hole in the carrier.
With a Victa, a rattle gun is a major advantage.

A bit different to what Max and Norm suggest, there's no tabs. "Bolt head side" is stamped onto the square dished washer which has just a round hole, not the cross shape in your photo Max.

It's a B & S motor with a 23 mm shaft. The coupling is keyed on with a single slot. Looks easy enough to get it off.

Problem is the double eared coupling does not fit exactly into the carrier grooves, there's a few degrees wobble room and I can't see or feel if it's in right from below, then even if the bolt is snugged up tight the carrier eventually gets loose and rattles around, and the ears have chewed into the grooves.

Just wondering if there's another easily available coupler/carrier arrangement off another B & S mower which I can put on when/if this gets too chewed up.

Not sure what you are talking about that is the standard boss and blade carrier fitted to thousands of 4 stroke Victa mowers

So why does the washer in the photo Max has posted differ from what is on mine?

It looks like it would fit over a splined spigot on the boss, and perhaps the blade carrier would also have a crucifix shaped center to positively locate it.

G'day MM and all,

I think most of us have had this type of boss and plate it's just the older type is more common and without images the first
type will come to mind first.

Yep I've had a lot like that ,there is a bit of a knack to fitting the blade plate , you just hold the plate up with one hand and
turn the plate so the drive side of the boss lines up with the plate and tighten the bolt with your other hand , I'd suggest
using a rattle gun to tighten the crank bolt if it's not tight enough it will come loose.

Once you line up the plate with the boss you can mark the boss and plate or use a centre punch ,that way next time the plate
is off you just line up the marks.

I have used the old boss with that blade plate , the old boss being round with no drive tangs , if you swap the boss you
also swap the washer to the old cross washer I put up before.

I've also used this boss with the two drive tangs and cut the tangs off to use a plate that doesn't have the drive tang position
on the plate.

Cheers
Max.

Hi Max,
I think Victa used the round boss on the Tecumesh motors for some reason

Hi Norm,

Yes that Tecumseh round boss is the one I use on my Honda LPG mower with the same 4 blade mulch plate that MM put up
before.

Cheers
Max.

Hi Max
The round bosses don't seem to slip so I'm not sure why the put the ears on the boss they used on the Briggs, I guess just to be sure.

Makes it more tricky to put on though. The two strokes have a key that locks onto the tension washer and that seems to work fine.

Hi Norm and Mf,

I've had quite a few of the early round boss mowers when the blade plates had to be thrown out , as there is not much
support on the boss shoulder to the blade plate and the blade plate will bend easier when people misuse the mower.

A few blade plates of mine were slipping on the boss and had worn the metal thin so no matter how much you tightened the
crank nut the plate would slip but I expect someone before has used the mower without tightening the crank nut enough

It looks like Victa used a larger surface area on the boss mounting face to support the larger heavier 4 blade mulch plates and
made that a standard so used the same boss even if it was .a smaller oval 2 blade plate and then added the ears to the boss
for more support and the ears would also stop the plate slipping but as Norm mentioned if you don't abuse your mower by
smashing the blades into unmovable objects then you aren't going to notice the difference with the 2 extra ears on the boss.

The 2 ears could also be an extra layer of safety to stop the blade plate bending if someone hits something solid with the blades.

Cheers
Max.

Thanks for your responses Norm, Max and MF.

Would still like to know if there's any other type of boss which fits onto a single slotted 23 mm B & S shaft.

Have managed to get this working satisfactorily, as you've advised it's just a matter of accurately lining up the driving edges of the two ears snug against the stamped plate grooves, and holding the wobbling bits in place while tightening the bolt with your third hand but not being able to eyeball the pieces as you go :-)

All of my other rescued mowers have a system of positively locating the blade or plate carrier to the crank boss with tabs, splines or several screws and the centre bolt just holds the boss firmly onto the crank. Same with all of the slashers I have worked on, and a gazillion other couplings.

A consumer item should not need an impact device when performing routine maintenance.

Otherwise it is a great mower.

MM if it troubles you that much just change the boss and blade carrier to a Rover type, but I can tell you if you are having trouble fitting the blade carrier on you do not have a hope in hell of getting the blade boss off a Briggs. I find it often takes up to 6 tons to get them off

23 mm isn't accurate enough , Norm mentioned a Tecumseh 7/8 boss would fit without the ears ,I'm sure there were images MM.

Yes I agree if I had 3 hands ,one to hold the crank from turning ,one to hold the blade plate into position and one hand
to tighten the bolt then my rattle gun shouldn't be needed for routine maintenance.

I was like Norm and struggled to get the boss off without a lot of force but found a 3 leg puller even when it's not pulling
perfectly straight will always remove the boss easier than 2 legs ( or 2 bolts )

I've removed at least 100 crank hubs with the 3 leg puller in the below images and lots hadn't been off in 50 years ,just using a
12 inch shifter to tighten the puller attached to the bearing plate and that doesn't pull perfectly straight because one leg pulls on the
bearing remover bolt.

Haven't had a blade hub not come off , once the puller is on ,you tighten the puller bolt as much as you can with the 12 inch
shifter and this alone won't budge the hub ,you need to put one side of the hub on a block of steel (train track ,I beam ,hammer head ,etc)
and then use a brass drift on the hub and hit the drift with a big hammer then the hub will move and you tighten the puller again and
use the hammer again until the hub just moves by tightening the puller bolt.

On old B&S motors that I was throwing out I would cut the crank shaft off with the boss and then use a press to remove
the boss but I find it easier now to smash one side of the alloy off the bottom of the motor so I can get the brass drift on
an angle to the boss and hit the boss off , you do get a small flat side on 3 positions on the boss by hitting it this way
but no matter how rusted the boss is, it still comes off.

Disadvantages of removing the boss my way is if you hit the boss too hard some will crack on one side but this
does make them much easier to remove but makes the boss useless , it's ok when it cracks if you're replacing the boss anyway.

Another disadvantage and I didn't think this was possible is I've completely stripped out the thread on my puller just using
a 12 inch shifter but I expect the cheap puller is the problem as I found it thrown out at a scrap metal yard even though it looked
brand new when I found it .If you spend more and buy something well made it usually lasts a lifetime .

Cheers
Max.

Thanks for those details Max.

I'm OK with pulling things apart, only times I've had problems is when some ditz has used red Loctite or similar, but a bit of heat fixes that.

Last time that happened I nearly flipped an old Toyota Corolla onto its roof trying to undo a front wheel hub nut with a length of steam pipe and a three foot breaker bar with a 1 inch drive socket.

As said the carrier is firmly mounted now and the rest of the mower will probably fail before the boss/carrier connection does.

If necessary there's the remains of a Toro in a shed which has a tapered end on the drive shaft which fits into a boss with sensibly designed bar locating tangs, might have a go at tapering the end of this Corvette shaft if I can't find an easy replacement for this two eared thing.

Hi Max,
I have no idea how you can get some of them off with just a 3 jaw puller, a couple I have not been able to move even with the 6 ton jack pulling on them. One I distinctly remember id the GXV 160 I ended up putting on the split bodied Tornado, mate wanted it put on an Ariens but I couldn't move the boss so I suggested to him that I build the wide body one, which he loves

These days they make impact devices for consumers that many now have. You'll be happy if you join their ranks, even without the ear carrier.

HI MM , Norm and MF,

MM if you don't like the 2 ears on the boss just get a cutting disc and cut them off but cut both sides even, so the hub is still
balanced and put a wet rag around the crank where the oil seal is so you don't melt the seal with sparks and excessive heat.

I've cut them off before but removed the boss to do so but you could cut the boss on the mower if you're careful.

You'd still want to tighten the crank nut up tight so the friction connection doesn't slip.


Norm ,if a hub is rusted on solid it just takes more force to try and move it free and this is how you can damage parts but
if you apply a fair amount of force to the boss and then shock the rusted connection loose it will come loose 99 percent of the time.

The same sort of principle is used at mower shops to remove rusted on ride on mower back wheels but they use an air hammer
to hit the centre of the axle.

If you have an old briggs that you are throwing out that the boss won't come off ,I don't even need to use a puller ,if I hit the
boss in 3 spots it will always come off, because of the shocking of the rusted connection it takes less force to remove.

I bought an Ingersoll rand rattle gun over 20 years ago , it was only around $50 new ,never had a problem with it.
I've also sold a fair few 2 Hp good air compressors for $15. each and thrown out at least 10 that could have easily
been repaired, just because I had too many.

Cheers
Max.

The Victa Corvette 700 became my favourite mower, easy to start, did a good cut, lots of power without needing maximum revs, very quiet, filled the catcher nicely, was able to idle slowly when removing and emptying catcher, great fuel economy, very comfortable to push and manoeuver.

Hit a rock and motor stopped instantly. No grinding type of noise, just stopped, big gouge into the rock. Wouldn't start again, compression OK, spark OK. Crankshaft not bent. Put some fuel down the spark plug hole, couldn't get a cough. Rope frayed with all the pulling, then broke so took off the covers and used a drill and socket to spin the motor but nada, nothing.

Appears the nut on the flywheel has never been touched, rather rusty. Could not budge the nut (don't have an impact driver) but plenty of big hammers, so couldn't take off the flywheel.

Suspect the flywheel key is sheared or flywheel slot damaged. Yes/no ?

Fortunately I still have 24 others, the grass has started to go beserk lately.

Would have to be flywheel key MM.

I agree they are a nice motor - due to massive time constraints I have been working under since august, I have only been using a masport SP with that same motor on it- except the IC cast iron sleeve. Havent even touched a 2 stroke or anything since then. Fires first or 2nd go, good on fuel and plenty of power so no complaints

Pull start is weak as though - looks like they made it a large puller presumably to make it easier to pull over - downside is there is more flex in the starter and more force on the parts if you give it a really decent pull

Thanks for your reply Tyler. The mower is sitting in the "morgue" along with a few others needing an autopsy before being either scrapped or put in the queue for repairs. Have been putting some oil on the stuck nut every now and then and have found what looks to be an identical flywheel nut from an old B&S defunct motor in case I have to resort to the angle grinder and cold chisel trick.

I find it interesting to ponder just why the DOV motor was so pleasant to use. Modifications and developments in OHV operation methodology have always been made with the aim of reducing/eliminating valve flutter or bounce at high rpm - think Ducati and their small desmodromic singles of the 1950s and 60s which developed a lot of HP from very few CCs, albeit fast but fragile.

Yet the Victa DOV just plods along slowly revwise with a very wide smooth powerband.

Anyway hopefully I'll be able to get that motor running again. Meanwhile I was given a Gardenline mower last week with a B&S Sprint 375 motor. Usually I wouldn't bother giving anything Gardenline a second look but this one has a really solid rustfree deck, only needed the air filter foam replaced and an oil change and it is flying, may even get an extra pair of blades added to the two blade carrier.

After putting a couple of drops of thin sewing machine oil on every few days for several weeks the flywheel nut unscrewed to reveal a sheared key. Hooray ! The keyway in the shaft is unharmed but the alloy flywheel keyway has been gouged wider a bit. I had some 4 mm keystock in the shed but the original key looks a tad bigger. Interestingly the original has a stamped B & S logo.

Being Saturday arvo and I'm out in the bush can't just wander down to a mower shop for a new B & S key so thinking might just use a bit of what's inhouse and some threadlock, but wondering if there's anything else I should be looking for when a motor hits something hard enough to shear a key. As mentioned everything else seems OK.

Thoughts ?

Ummm, to answer my own question...

Put the new smaller key in, smeared some threadlock around, put the flywheel on and as the nut was being tightened noticed two cracks radiating out from the centre of the flywheel.

Another old mower off to the scrap bin

Actooooolly, as I really liked using this mower before this happened perhaps the flywheel from another B & S might fit?

On the underside is " 3C ". Is that a common type of flywheel?

Dont think its a very common flywheel unfortunately. From memory, it has four vertical prongs that the starter locks into.

Maybe a quantum could be fitted if you bodge the starter (or just use a drill) but I think there is a size difference

Correct Tyler, 4 straight prongs.

The flywheel (marked 53D) from an old Toro has exactly the same OD and I was happily getting ready to bodge up a starter arrangement but noted a big chunk flaked off one side of the slot in the crankshaft taper therefore will be scrapping this motor.

Sometimes you just have to know when to pull the pin on some of these motors