OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Victa Two Stroke Engines Victa Performance Mods

Hey guys, I'm Casey and I'm New to outdoor king. I'm a massive victa enthusiast and for the past couple of years I've gutted plenty of mowers, 160's and early and late 125's but been modifying primarily victa 160's, trying different things as I've gone along, had failures and triumphs to varying degrees.so far my best setups have been a 5400 rpm twin g3 carbyd full crank 160, a 7600rpm full crank side start 160 with 25mm tillotson and a 6000/6500rpm 160 with full circle crank,reed valve and 25mm tillotson. Currently working on a crankcase reed valved full circle 160 with squish band head and expansion chamber setup. If anyone's done performance mods with victas and wants to exchange ideas and go into more details as to the stuff I've done then I'd love to hear from you. I wish I could upload pics on here of the different things I've done but I'm not that computer savy, but I'm able to email pics of some stuff if anyone wants. Anyway, hope to be talking soon to any of you guys who share a likeminded interest in squeezing more grunt outa these old victas. Cheers

Hi and Ltdkc83 to the ODK forum.
If you need to know how to upload photos then click here
The only thing is (and I don't think is mentioned there) you must resize your photos.Most normal photos(JEPS) are from around 1.25mb and upwards.So you need to resize them so they can be sent.Just open paint and resize your photos around the 50% mark save and then you should be able to upload.Not really that hard,just spend some time you might surprise yourself.If you can get a 160cc to rev at 6500rpm then you'll be able to upload pictures.
What do you do with the rest of the mowers once you've pulled the engine off?
I'm more into restoring to their original condition but each to their own.
I'd still like to see some pictures though.
Once again

Thanks blumbly, yeah I didn't mention that I'm accessing this site from my mobile phone and not a computer. To be honest,im 33 and I've never owned a computer and therefore have had bugger all experience doing what most people would probably find very easy and unless I have someone beside me physically showing me what to do,then I really struggle when it comes to certain things. Never even had Facebook or anything like that. All I basically use the net for is to Google search stuff I'm interested in or look at stuff on YouTube. That's it.Lol. To answer your question about what I do with the mowers once I pull the motors off them, the more common victa 160 stuff I just take to the tip. The older less common stuff I've put aside and will sell it, like victa sheerline stuff, I've made a point of not throwing out as it's far less common than the later models of the popular victa 18's which every man and his dog seems to have and thinks is rare. if I was going to restore a vintage victa it wouldn't be a victa 18 past a model 2a unless it was a complete victa automatic with all the super rare bells and whistles. $300 and up for Nos or repro wheels are a big killer for victa 18's, then a full true and proper rebuild of the engine is $200 or more, then include correct paint, decals, nos or mint handlebar badge and all the true and correct incidentals for a mint resto that a highly knowledgeable and fastidious victa enthusiast will struggle to nit pick, your looking at over $600 to properly restore and these things just aren't selling for that because the market is flooded with them and a victa 18's in need of restoration are up for sale all the time and usually for delusional prices. The 12 victa 18's ive baught over the past 2 years I haven't paid any more than $40 each for. Most Complete 18's minus engines just go to the tip. 2 bases I've made a point of not throwing out are ones that don't have that provision for the bolt on Edger on the carby side. They seem to be far less common. One even has the accessory toe protector ring which is cool. Including those 2, All up I've got 6 or 8 victa 18 bases plus cowls, tanks and starters to get rid of plus some sheerline stuff. If you or anyone you know wants any of it, let me know. I'm going to get rid of it fairly cheap.

I have often pondered whether it is possible to introduce forced induction on Victas.
The G4 would need some different mouldings to make it work a well as some elaborate pipe work
It would sound magic and give that extra oomph in tall grass.

G'day Mowerfreak,
Just as a hypothetical, given the complexity of even a basic turbocharger/supercharger setup, why would you even think about using a G4? A small bore Keihin or Mikuni racing motorcycle carby is infinitely more tuneable...

And welcome to ODK, Ltdkc83. As far as the early plastic Victa wheels are concerned, have a little patience.

The prices that even the aftermarket repros are now fetching, will pretty much ensure that somebody in China will make and market copies, in time.

Forced induction victa...... Cool thought. Has been done by a bloke mowerfreak. It was a fairly stock victa 160 fully rebuilt mounted on a bmx bike with a small turbocharger plumbed up to it. He was running a mikuni of some description and from memory was fiddling with carby position I think he started on a draw through system then was wanting to try a blow through setup. As far as forced induction goes I'm not sure how beneficial it would be. I would think You'd probly get a bit of blow by at a certain point on the power stroke as you'd have all ports open for a period and alot of fresh charge getting forced out the exhaust. unless you had a suitable expansion chamber it'd probly just be an impressive exercise in fuel wastage. Lol. And as far as carbys go, gadge is spot on. Plastic g4's aren't much good for anything other than mowing lawns. Use a mikuni or a small tillotson. And gadge, thanks for the welcome.your probly right about the wheels, with the amount of people doing resto's on early victas there will probably be a Chinese substitute hitting the market in the future. But with so many people restoring them, they'll still be very common and as much as I love the look of them, I'd probly rather restore something far less common and that you don't see much of like an early sheerline or one of the victa twins. I wish I could upload pics and videos coz i recon that a lot of you blokes would get a kick out of my twin carbyd sheerline and my reed valved victas.

I suspected the two stroke aspect would pose a problem, but all practicalities aside, the thought of a Victa VC Sports revving at full cry with a snail bolted on hissing dog whistle notes comes across as very marketable for the neighbour impressing niche.
Just the name alone would be a best seller. The Victa Vortex Turbo limited edition.

Haha. Yeah I know what you mean. Victas do do have a sweet sound when your ringing their neck! If you know of any vc sports kicking around I wouldn't mind a few heads and possibility crankshafts if they're a full circle job. If you wanna hear a victa having a good scream I'll see if I can email a vid of my twin carby sheerline. Revs out to 5400 rpm.

This YouTube clip came immediately to mind. Check out the carby near the end.

Warning: some coarse language.

Yeah that thing goes pretty good hey. That carby is a mikuni. I've got a 24mm mikuni I'm gonna try on my crankcase reed valved 160 with an expansion chamber off a 125 or 157 2stroke dirt bike, I'll also try my 25mm hl tillotson, and maybe try a twin walbro setup. It'll also have a squish band head off a Suzuki ts 100. Along with opened up transfer ports that flow into the crankcase, enlarged exhaust port and crankcase stuffing, hopefully it'll go real good. If it works well then I'll look at casting my own reed block crankcases which will be able to be used on not just 160's but victa 125's as well. As the later 125 victa crankcases are interchangeable with 160's I can cover both sizes. The only differences between the 2 really are the cylinders which have the same bolt pattern at the base, and the come of and crank pin. Happy days eh?

Sorry, conrod and crank pin

Finally figured out how to upload pics. Happy days! Lok

G'day folks,

Over the years, the go-karters have tried just about everything imaginable, to hot up Victa engines.

Just plug the search term 'Victa go-kart' into the Google Custom Search window above...

This type of go kart would be the type your talking about gadge. This is a 1960 vintage kart that I'm going to end up racing or "demonstrating" as the vintage Keating boys put it. Lol. It'll have a hotty reed valved methanol burning victa 125 powering it. From what the vintage kart guys tell me, it's the 125's that they really get screaming. Apparently the 160's aren't quite as good to get power out of as the 125's and therefore not many people have bothered spending the time modifying them. Seeing as how 160's are more abundant at this point in time, I want to see just what kind of power I can get out of one without completely having to re invent the wheel. As Martian Luther king said "I have a dream" but mine is more simple and fun, consisting of go karts, drift trikes and motorised bikes powered by hotty modified victas.

Does anyone know of anyone who can rebore victa cylinders?

G'day folks,
As long as the barrel isn't already at maximum oversize [+0.060"/1.5mm, these days], GA Spares offer a changeover service via their dealers.

Way cheaper than getting one done as a one-off [unless you can get 'mate's rates'] - but this does require that your barrel has standard porting.

http://www.gaspares.com.au/program/...p;SEARCHSTOCKDESC=1&SEARCHSUPPCODE=1

Ok. Great, but what about boring a cylinder you've done port modifications to. Do they do that or do they operate strictly on a changeover basis

Like-for-like changeover only. So you'll have to go the custom route - sniff around the go-kart scene a bit; it's a haven for tinkerers.