Wanting to attach clutch to Victa powertorque engine

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sexyvicta

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Hi, a friend and i are wanting to bolt a victa powertorque engine to a pushbike frame. we're in NZ

I guessing there must be a few australians who have done this or seen something similar?

looking for a cheap clutch off a reel mower or scooter but not having much luck.

We are also unsure of the best way to attach a clutch or sproket to this engine

any suggestions?

cheers
 
Bluethunder3320

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what is the shaft diameter? does it have a keyway?

go kart clutches are available in 5/8", 3/4" and 1" shaft diameter.

search the forum, i saw someone use direct drive on one here before.

if its 5/8 or 3/4 you are looking at $30 american. if it is 1" (doubt it) then it can cost minimum $120 american. those ain't cheap.

if the shaft is tapered you may either need a different crankshaft, or find a way to attach a sprocket to the tapered shaft and put the clutch on a jackshaft.

welcome to the forum sexyvicta :roflol:
 
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sexyvicta

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Bluethunder3320 said:
if the shaft is tapered you may either need a different crankshaft, or find a way to attach a sprocket to the tapered shaft and put the clutch on a jackshaft.

welcome to the forum sexyvicta :roflol:
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Thanks
yes its tapered, a tapered sleave goes over the top. Then the cutting disk is fitted. The end of crankshaft is threaded to attach cutting disk retaining nut.. edit: would be way easier if the shaft was the same as brigs/honda engines etc

Prob easier to run a sproket to drive a remote clutch like you say

Keen for some feedback from the Ausis as i belive you can get adapters to attach a clutch to the earlier victa engines(they put them in reel mowers, minibikes, gokarts etc) and i was wondering if they had anything similar available for the powertorque engine

might just be ruthless and go direct drive if we cant find a cheap clutch :cheers2:
 
redsox985

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This is a decent read on Victas, but you seem to know a bit about what's going on. Also, Russ has used Lawn Boy engines, pretty much like the American version of a Victa, and has also worked the PTOs to accept a clutch. I'm sure he'll be along to add in how he adapted the PTOs to work.
 
newrider3

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From what I've read up on here about Victa engines, is that the "Powertorque" is to be avoided for a kart application. Mostly the half-crank design having poor durability.
I'm sure one of our Australian members can chime in.
 
jman231994

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Suprisingly ok. I've only sat on it when it wasnt running and it had a tendency to lean that way. But she was saying as soon as you get moving on it you barely notice its there. Gyro effect haha

Pretty epic though
 
sideways

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The power torque has a 13mm threaded shaft, go to a small motors shop and order a 13mm bore pulley to fit an A section belt and 2" or larger diameter and run a pulley tensioner clutch.

You cut a key way in to the threaded shaft with a Dremel and use the blade retaining nut to hold the pulley on.

If you really want a centrifugal clutch get a 13mm bore sprocket instead of the pulley and run the clutch on a jack shaft.

Another option is to find a pulley boss off a self propelled Victa Power Torque. Like so. They are only a Z section belt though so they can't transmit very much power.

http://www.diygokarts.com/vb/attachment.php?attachmentid=8032&d=1277549365

What ever you do, you must keep the blade mounting boss, it supports the flywheel.

There are no adapters made to fit Power Torques, for good reason really, they aren't exactly performance engines. Get an older full crank Victa if you can.

Replace the carby with something better, take the head off and clean all the carbon off it, clean the carbon out of the exhaust port and you'l get a fair few more ponies. It will be limited by the ignition system to 5000-6000rpm, I wouldn't recommend revving to max revs for too long though, not the strongest design of engine for sure.

Good luck with your project. :thumbsup:

Thanks

Hayden
 
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hey thanks for all the replys

i have tried to find an early victa engine but they arnt so easy to come buy. I think more people over here bought masports back then as they are easy to get hold of with the two stroke ironhorse engine. Old victas do pop up for sale from time to time but i dont realy want to spend money on this project

The main reason i'm using the power torque engine is that i mow lawns for a living and have about about 7 victas in my garage :wai: so i have parts for africa. + i know how to rebuild them etc. Its always easier to stick with what you know haha


Sideways: i will try and find a '13mm bore sproket' and go from there. I did consider using a pully off a self drive mower but i think it will slip too much. Would prefer chain drive

Cam: im in Auckland. Where abouts in Whangarei are you? my granparents live in Whau Valley
 
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newrider3 said:
From what I've read up on here about Victa engines, is that the "Powertorque" is to be avoided for a kart application. Mostly the half-crank design having poor durability.
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im sure it'll be fine, im not looking to make much power/revs out of this engine. In the field i find them to be a much better engine than the brigs 4 strokes. I have never had any major problems. Only have to do normal 2 stroke maintainence. Pistons, rings, bearings and seals are all very cheap

sideways said:
Replace the carby with something better
Click to expand...

what would you recomend? i have a carb off a 5hp brigs engine...also 3 amal GP carbs off a triumph trident- complete with velo stacks haha. However i was thinking something like a 19mm carb off one of those chinese bikes would be the go? or maybe a small mikuni off an old jap bike
 
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full crank is a normal crankshaft

half crank is only on one side of the conrod if you know what i mean? the crank finishes where the conrod conects. Nothing on the other side. Cheaper to make and easier to service but less durable i guess

as seen on some smaller weedeaters/weedwackers etc

try google for a more technical answer haha
 
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Has a counter weight inside the crankcase. Most cranks extend out each side, one side has a flywheel attached and one is the pto. Air compressor engines especially electric ones work like this. And as he said, weed whacker motors too.
 
sideways

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sexyvicta said:
hey thanks for all the replys

i have tried to find an early victa engine but they arnt so easy to come buy. I think more people over here bought masports back then as they are easy to get hold of with the two stroke ironhorse engine. Old victas do pop up for sale from time to time but i dont realy want to spend money on this project

The main reason i'm using the power torque engine is that i mow lawns for a living and have about about 7 victas in my garage :wai: so i have parts for africa. + i know how to rebuild them etc. Its always easier to stick with what you know haha


Sideways: i will try and find a '13mm bore sproket' and go from there. I did consider using a pully off a self drive mower but i think it will slip too much. Would prefer chain drive

Cam: im in Auckland. Where abouts in Whangarei are you? my granparents live in Whau Valley
Click to expand...

Hah, It's quite the opposite here, sometimes there'l be half a dozen full crank Vitctas at the tip, I've never seen a Masport. 13mm bore sprocket shouldn't be too hard to find, you should measure your shaft and make sure it is 13mm diameter, they might of changed it for some reason. :thumbsup:

sexyvicta said:
im sure it'll be fine, im not looking to make much power/revs out of this engine. In the field i find them to be a much better engine than the brigs 4 strokes. I have never had any major problems. Only have to do normal 2 stroke maintainence. Pistons, rings, bearings and seals are all very cheap

what would you recomend? i have a carb off a 5hp brigs engine...also 3 amal GP carbs off a triumph trident- complete with velo stacks haha. However i was thinking something like a 19mm carb off one of those chinese bikes would be the go? or maybe a small mikuni off an old jap bike
Click to expand...

Briggs mower engines suck lol, no torque at all, especially modern ones, One of those Chinese bike carbs would be pretty good I think.

toystory_4wd said:
Guys, what's this half-crank, full-crank thing? I'm not familiar with those terms...
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Like this, this is what you see when you pull the side cover/pull starter (pull starter is built into the side cover) off, they only have one main bearing journal. It's very obvious this engine was designed to be a simple and cheap as possible, still makes for a great lawnmower engine though.


Thanks

Hayden
 
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